Update SNAPSHOT to 2.1.0.RC3

* Handle errors for non-existing topics

When topic creation is disabled both on the binder and the broker,
the binder currently throws an NPE. Catching this situation and
throw a more graceful error to the user.

Adding tests to verify.

Resolves #513

* Addressing PR review comments

.gitignore

@@ -18,6 +18,7 @@ _site/
 *.ipr
 *.iws
 .idea/*
+*/.idea
 .factorypath
 dump.rdb
 .apt_generated

README.adoc

@@ -1,3 +1,711 @@
-# spring-cloud-stream-binder-kafka
+// Do not edit this file (e.g. go instead to src/main/asciidoc)
 
-Spring Cloud Stream Binder implementation for Kafka
+:jdkversion: 1.8
+:github-tag: master
+:github-repo: spring-cloud/spring-cloud-stream-binder-kafka
+
+:github-raw: https://raw.githubusercontent.com/{github-repo}/{github-tag}
+:github-code: https://github.com/{github-repo}/tree/{github-tag}
+
+image::https://circleci.com/gh/spring-cloud/spring-cloud-stream-binder-kafka.svg?style=svg["CircleCI", link="https://circleci.com/gh/spring-cloud/spring-cloud-stream-binder-kafka"]
+image::https://codecov.io/gh/spring-cloud/spring-cloud-stream-binder-kafka/branch/{github-tag}/graph/badge.svg["codecov", link="https://codecov.io/gh/spring-cloud/spring-cloud-stream-binder-kafka"]
+image::https://badges.gitter.im/spring-cloud/spring-cloud-stream-binder-kafka.svg[Gitter, link="https://gitter.im/spring-cloud/spring-cloud-stream-binder-kafka?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"]
+
+// ======================================================================================
+
+//= Overview
+[partintro]
+--
+This guide describes the Apache Kafka implementation of the Spring Cloud Stream Binder.
+It contains information about its design, usage, and configuration options, as well as information on how the Stream Cloud Stream concepts map onto Apache Kafka specific constructs.
+In addition, this guide explains the Kafka Streams binding capabilities of Spring Cloud Stream.
+--
+
+== Apache Kafka Binder
+
+=== Usage
+
+To use Apache Kafka binder, you need to add `spring-cloud-stream-binder-kafka` as a dependency to your Spring Cloud Stream application, as shown in the following example for Maven:
+
+[source,xml]
+----
+<dependency>
+  <groupId>org.springframework.cloud</groupId>
+  <artifactId>spring-cloud-stream-binder-kafka</artifactId>
+</dependency>
+----
+
+Alternatively, you can also use the Spring Cloud Stream Kafka Starter, as shown inn the following example for Maven:
+
+[source,xml]
+----
+<dependency>
+  <groupId>org.springframework.cloud</groupId>
+  <artifactId>spring-cloud-starter-stream-kafka</artifactId>
+</dependency>
+----
+
+=== Overview
+
+The following image shows a simplified diagram of how the Apache Kafka binder operates:
+
+.Kafka Binder
+image::{github-raw}/docs/src/main/asciidoc/images/kafka-binder.png[width=300,scaledwidth="50%"]
+
+The Apache Kafka Binder implementation maps each destination to an Apache Kafka topic.
+The consumer group maps directly to the same Apache Kafka concept.
+Partitioning also maps directly to Apache Kafka partitions as well.
+
+The binder currently uses the Apache Kafka `kafka-clients` 1.0.0 jar and is designed to be used with a broker of at least that version.
+This client can communicate with older brokers (see the Kafka documentation), but certain features may not be available.
+For example, with versions earlier than 0.11.x.x, native headers are not supported.
+Also, 0.11.x.x does not support the `autoAddPartitions` property.
+
+=== Configuration Options
+
+This section contains the configuration options used by the Apache Kafka binder.
+
+For common configuration options and properties pertaining to binder, see the <<binding-properties,core documentation>>.
+
+==== Kafka Binder Properties
+
+spring.cloud.stream.kafka.binder.brokers::
+A list of brokers to which the Kafka binder connects.
++
+Default: `localhost`.
+spring.cloud.stream.kafka.binder.defaultBrokerPort::
+`brokers` allows hosts specified with or without port information (for example, `host1,host2:port2`).
+This sets the default port when no port is configured in the broker list.
++
+Default: `9092`.
+spring.cloud.stream.kafka.binder.configuration::
+Key/Value map of client properties (both producers and consumer) passed to all clients created by the binder.
+Due to the fact that these properties are used by both producers and consumers, usage should be restricted to common properties -- for example, security settings.
+Unknown Kafka producer or consumer properties provided through this configuration are filtered out and not allowed to propagate.
+Properties here supersede any properties set in boot.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.consumerProperties::
+Key/Value map of arbitrary Kafka client consumer properties.
+In addition to support known Kafka consumer properties, unknown consumer properties are allowed here as well.
+Properties here supersede any properties set in boot and in the `configuration` property above.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.headers::
+The list of custom headers that are transported by the binder.
+Only required when communicating with older applications (<= 1.3.x) with a `kafka-clients` version < 0.11.0.0. Newer versions support headers natively.
++
+Default: empty.
+spring.cloud.stream.kafka.binder.healthTimeout::
+The time to wait to get partition information, in seconds.
+Health reports as down if this timer expires.
++
+Default: 10.
+spring.cloud.stream.kafka.binder.requiredAcks::
+The number of required acks on the broker.
+See the Kafka documentation for the producer `acks` property.
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.minPartitionCount::
+Effective only if `autoCreateTopics` or `autoAddPartitions` is set.
+The global minimum number of partitions that the binder configures on topics on which it produces or consumes data.
+It can be superseded by the `partitionCount` setting of the producer or by the value of `instanceCount * concurrency` settings of the producer (if either is larger).
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.producerProperties::
+Key/Value map of arbitrary Kafka client producer properties.
+In addition to support known Kafka producer properties, unknown producer properties are allowed here as well.
+Properties here supersede any properties set in boot and in the `configuration` property above.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.replicationFactor::
+The replication factor of auto-created topics if `autoCreateTopics` is active.
+Can be overridden on each binding.
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.autoCreateTopics::
+If set to `true`, the binder creates new topics automatically.
+If set to `false`, the binder relies on the topics being already configured.
+In the latter case, if the topics do not exist, the binder fails to start.
++
+NOTE: This setting is independent of the `auto.topic.create.enable` setting of the broker and does not influence it.
+If the server is set to auto-create topics, they may be created as part of the metadata retrieval request, with default broker settings.
++
+Default: `true`.
+spring.cloud.stream.kafka.binder.autoAddPartitions::
+If set to `true`, the binder creates new partitions if required.
+If set to `false`, the binder relies on the partition size of the topic being already configured.
+If the partition count of the target topic is smaller than the expected value, the binder fails to start.
++
+Default: `false`.
+spring.cloud.stream.kafka.binder.transaction.transactionIdPrefix::
+Enables transactions in the binder. See `transaction.id` in the Kafka documentation and https://docs.spring.io/spring-kafka/reference/html/_reference.html#transactions[Transactions] in the `spring-kafka` documentation.
+When transactions are enabled, individual `producer` properties are ignored and all producers use the `spring.cloud.stream.kafka.binder.transaction.producer.*` properties.
++
+Default `null` (no transactions)
+spring.cloud.stream.kafka.binder.transaction.producer.*::
+Global producer properties for producers in a transactional binder.
+See `spring.cloud.stream.kafka.binder.transaction.transactionIdPrefix` and <<kafka-producer-properties>> and the general producer properties supported by all binders.
++
+Default: See individual producer properties.
+
+spring.cloud.stream.kafka.binder.headerMapperBeanName::
+The bean name of a `KafkaHeaderMapper` used for mapping `spring-messaging` headers to and from Kafka headers.
+Use this, for example, if you wish to customize the trusted packages in a `DefaultKafkaHeaderMapper` that uses JSON deserialization for the headers.
++
+Default: none.
+
+[[kafka-consumer-properties]]
+==== Kafka Consumer Properties
+
+The following properties are available for Kafka consumers only and
+must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.consumer.`.
+
+admin.configuration::
+A `Map` of Kafka topic properties used when provisioning topics -- for example, `spring.cloud.stream.kafka.bindings.input.consumer.admin.configuration.message.format.version=0.9.0.0`
++
+Default: none.
+
+admin.replicas-assignment::
+A Map<Integer, List<Integer>> of replica assignments, with the key being the partition and the value being the assignments.
+Used when provisioning new topics.
+See the `NewTopic` Javadocs in the `kafka-clients` jar.
++
+Default: none.
+
+admin.replication-factor::
+The replication factor to use when provisioning topics. Overrides the binder-wide setting.
+Ignored if `replicas-assignments` is present.
++
+Default: none (the binder-wide default of 1 is used).
+
+autoRebalanceEnabled::
+When `true`, topic partitions is automatically rebalanced between the members of a consumer group.
+When `false`, each consumer is assigned a fixed set of partitions based on `spring.cloud.stream.instanceCount` and `spring.cloud.stream.instanceIndex`.
+This requires both the `spring.cloud.stream.instanceCount` and `spring.cloud.stream.instanceIndex` properties to be set appropriately on each launched instance.
+The value of the `spring.cloud.stream.instanceCount` property must typically be greater than 1 in this case.
++
+Default: `true`.
+ackEachRecord::
+When `autoCommitOffset` is `true`, this setting dictates whether to commit the offset after each record is processed.
+By default, offsets are committed after all records in the batch of records returned by `consumer.poll()` have been processed.
+The number of records returned by a poll can be controlled with the `max.poll.records` Kafka property, which is set through the consumer `configuration` property.
+Setting this to `true` may cause a degradation in performance, but doing so reduces the likelihood of redelivered records when a failure occurs.
+Also, see the binder `requiredAcks` property, which also affects the performance of committing offsets.
++
+Default: `false`.
+autoCommitOffset::
+Whether to autocommit offsets when a message has been processed.
+If set to `false`, a header with the key `kafka_acknowledgment` of the type `org.springframework.kafka.support.Acknowledgment` header is present in the inbound message.
+Applications may use this header for acknowledging messages.
+See the examples section for details.
+When this property is set to `false`, Kafka binder sets the ack mode to `org.springframework.kafka.listener.AbstractMessageListenerContainer.AckMode.MANUAL` and the application is responsible for acknowledging records.
+Also see `ackEachRecord`.
++
+Default: `true`.
+autoCommitOnError::
+Effective only if `autoCommitOffset` is set to `true`.
+If set to `false`, it suppresses auto-commits for messages that result in errors and commits only for successful messages. It allows a stream to automatically replay from the last successfully processed message, in case of persistent failures.
+If set to `true`, it always auto-commits (if auto-commit is enabled).
+If not set (the default), it effectively has the same value as `enableDlq`, auto-committing erroneous messages if they are sent to a DLQ and not committing them otherwise.
++
+Default: not set.
+resetOffsets::
+Whether to reset offsets on the consumer to the value provided by startOffset.
+Must be false if a `KafkaRebalanceListener` is provided; see <<rebalance-listener>>.
++
+Default: `false`.
+startOffset::
+The starting offset for new groups.
+Allowed values: `earliest` and `latest`.
+If the consumer group is set explicitly for the consumer 'binding' (through `spring.cloud.stream.bindings.<channelName>.group`), 'startOffset' is set to `earliest`. Otherwise, it is set to `latest` for the `anonymous` consumer group.
+Also see `resetOffsets` (earlier in this list).
++
+Default: null (equivalent to `earliest`).
+enableDlq::
+When set to true, it enables DLQ behavior for the consumer.
+By default, messages that result in errors are forwarded to a topic named `error.<destination>.<group>`.
+The DLQ topic name can be configurable by setting the `dlqName` property.
+This provides an alternative option to the more common Kafka replay scenario for the case when the number of errors is relatively small and replaying the entire original topic may be too cumbersome.
+See <<kafka-dlq-processing>> processing for more information.
+Starting with version 2.0, messages sent to the DLQ topic are enhanced with the following headers: `x-original-topic`, `x-exception-message`, and `x-exception-stacktrace` as `byte[]`.
+**Not allowed when `destinationIsPattern` is `true`.**
++
+Default: `false`.
+configuration::
+Map with a key/value pair containing generic Kafka consumer properties.
+In addition to having Kafka consumer properties, other configuration properties can be passed here.
+For example some properties needed by the application such as `spring.cloud.stream.kafka.bindings.input.consumer.configuration.foo=bar`.
++
+Default: Empty map.
+dlqName::
+The name of the DLQ topic to receive the error messages.
++
+Default: null (If not specified, messages that result in errors are forwarded to a topic named `error.<destination>.<group>`).
+dlqProducerProperties::
+Using this, DLQ-specific producer properties can be set.
+All the properties available through kafka producer properties can be set through this property.
++
+Default: Default Kafka producer properties.
+standardHeaders::
+Indicates which standard headers are populated by the inbound channel adapter.
+Allowed values: `none`, `id`, `timestamp`, or `both`.
+Useful if using native deserialization and the first component to receive a message needs an `id` (such as an aggregator that is configured to use a JDBC message store).
++
+Default: `none`
+converterBeanName::
+The name of a bean that implements `RecordMessageConverter`. Used in the inbound channel adapter to replace the default `MessagingMessageConverter`.
++
+Default: `null`
+idleEventInterval::
+The interval, in milliseconds, between events indicating that no messages have recently been received.
+Use an `ApplicationListener<ListenerContainerIdleEvent>` to receive these events.
+See <<pause-resume>> for a usage example.
++
+Default: `30000`
+destinationIsPattern::
+When true, the destination is treated as a regular expression `Pattern` used to match topic names by the broker.
+When true, topics are not provisioned, and `enableDlq` is not allowed, because the binder does not know the topic names during the provisioning phase.
+Note, the time taken to detect new topics that match the pattern is controlled by the consumer property `metadata.max.age.ms`, which (at the time of writing) defaults to 300,000ms (5 minutes).
+This can be configured using the `configuration` property above.
++
+Default: `false`
+
+[[kafka-producer-properties]]
+==== Kafka Producer Properties
+
+The following properties are available for Kafka producers only and
+must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.producer.`.
+
+admin.configuration::
+A `Map` of Kafka topic properties used when provisioning new topics -- for example, `spring.cloud.stream.kafka.bindings.input.consumer.admin.configuration.message.format.version=0.9.0.0`
++
+Default: none.
+
+admin.replicas-assignment::
+A Map<Integer, List<Integer>> of replica assignments, with the key being the partition and the value being the assignments.
+Used when provisioning new topics.
+See `NewTopic` javadocs in the `kafka-clients` jar.
++
+Default: none.
+
+admin.replication-factor::
+The replication factor to use when provisioning new topics. Overrides the binder-wide setting.
+Ignored if `replicas-assignments` is present.
++
+Default: none (the binder-wide default of 1 is used).
+
+bufferSize::
+Upper limit, in bytes, of how much data the Kafka producer attempts to batch before sending.
++
+Default: `16384`.
+sync::
+Whether the producer is synchronous.
++
+Default: `false`.
+batchTimeout::
+How long the producer waits to allow more messages to accumulate in the same batch before sending the messages.
+(Normally, the producer does not wait at all and simply sends all the messages that accumulated while the previous send was in progress.) A non-zero value may increase throughput at the expense of latency.
++
+Default: `0`.
+messageKeyExpression::
+A SpEL expression evaluated against the outgoing message used to populate the key of the produced Kafka message -- for example, `headers['myKey']`.
+The payload cannot be used because, by the time this expression is evaluated, the payload is already in the form of a `byte[]`.
++
+Default: `none`.
+headerPatterns::
+A comma-delimited list of simple patterns to match Spring messaging headers to be mapped to the Kafka `Headers` in the `ProducerRecord`.
+Patterns can begin or end with the wildcard character (asterisk).
+Patterns can be negated by prefixing with `!`.
+Matching stops after the first match (positive or negative).
+For example `!ask,as*` will pass `ash` but not `ask`.
+`id` and `timestamp` are never mapped.
++
+Default: `*` (all headers - except the `id` and `timestamp`)
+configuration::
+Map with a key/value pair containing generic Kafka producer properties.
++
+Default: Empty map.
+
+NOTE: The Kafka binder uses the `partitionCount` setting of the producer as a hint to create a topic with the given partition count (in conjunction with the `minPartitionCount`, the maximum of the two being the value being used).
+Exercise caution when configuring both `minPartitionCount` for a binder and `partitionCount` for an application, as the larger value is used.
+If a topic already exists with a smaller partition count and `autoAddPartitions` is disabled (the default), the binder fails to start.
+If a topic already exists with a smaller partition count and `autoAddPartitions` is enabled, new partitions are added.
+If a topic already exists with a larger number of partitions than the maximum of (`minPartitionCount` or `partitionCount`), the existing partition count is used.
+
+==== Usage examples
+
+In this section, we show the use of the preceding properties for specific scenarios.
+
+===== Example: Setting `autoCommitOffset` to `false` and Relying on Manual Acking
+
+This example illustrates how one may manually acknowledge offsets in a consumer application.
+
+This example requires that `spring.cloud.stream.kafka.bindings.input.consumer.autoCommitOffset` be set to `false`.
+Use the corresponding input channel name for your example.
+
+[source]
+----
+@SpringBootApplication
+@EnableBinding(Sink.class)
+public class ManuallyAcknowdledgingConsumer {
+
+ public static void main(String[] args) {
+     SpringApplication.run(ManuallyAcknowdledgingConsumer.class, args);
+ }
+
+ @StreamListener(Sink.INPUT)
+ public void process(Message<?> message) {
+     Acknowledgment acknowledgment = message.getHeaders().get(KafkaHeaders.ACKNOWLEDGMENT, Acknowledgment.class);
+     if (acknowledgment != null) {
+         System.out.println("Acknowledgment provided");
+         acknowledgment.acknowledge();
+     }
+ }
+}
+----
+
+===== Example: Security Configuration
+
+Apache Kafka 0.9 supports secure connections between client and brokers.
+To take advantage of this feature, follow the guidelines in the http://kafka.apache.org/090/documentation.html#security_configclients[Apache Kafka Documentation] as well as the Kafka 0.9 http://docs.confluent.io/2.0.0/kafka/security.html[security guidelines from the Confluent documentation].
+Use the `spring.cloud.stream.kafka.binder.configuration` option to set security properties for all clients created by the binder.
+
+For example, to set `security.protocol` to `SASL_SSL`, set the following property:
+
+[source]
+----
+spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_SSL
+----
+
+All the other security properties can be set in a similar manner.
+
+When using Kerberos, follow the instructions in the http://kafka.apache.org/090/documentation.html#security_sasl_clientconfig[reference documentation] for creating and referencing the JAAS configuration.
+
+Spring Cloud Stream supports passing JAAS configuration information to the application by using a JAAS configuration file and using Spring Boot properties.
+
+====== Using JAAS Configuration Files
+
+The JAAS and (optionally) krb5 file locations can be set for Spring Cloud Stream applications by using system properties.
+The following example shows how to launch a Spring Cloud Stream application with SASL and Kerberos by using a JAAS configuration file:
+
+[source,bash]
+----
+ java -Djava.security.auth.login.config=/path.to/kafka_client_jaas.conf -jar log.jar \
+   --spring.cloud.stream.kafka.binder.brokers=secure.server:9092 \
+   --spring.cloud.stream.bindings.input.destination=stream.ticktock \
+   --spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_PLAINTEXT
+----
+
+====== Using Spring Boot Properties
+
+As an alternative to having a JAAS configuration file, Spring Cloud Stream provides a mechanism for setting up the JAAS configuration for Spring Cloud Stream applications by using Spring Boot properties.
+
+The following properties can be used to configure the login context of the Kafka client:
+
+spring.cloud.stream.kafka.binder.jaas.loginModule::
+The login module name. Not necessary to be set in normal cases.
++
+Default: `com.sun.security.auth.module.Krb5LoginModule`.
+spring.cloud.stream.kafka.binder.jaas.controlFlag::
+The control flag of the login module.
++
+Default: `required`.
+spring.cloud.stream.kafka.binder.jaas.options::
+Map with a key/value pair containing the login module options.
++
+Default: Empty map.
+
+The following example shows how to launch a Spring Cloud Stream application with SASL and Kerberos by using Spring Boot configuration properties:
+
+[source,bash]
+----
+ java --spring.cloud.stream.kafka.binder.brokers=secure.server:9092 \
+   --spring.cloud.stream.bindings.input.destination=stream.ticktock \
+   --spring.cloud.stream.kafka.binder.autoCreateTopics=false \
+   --spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_PLAINTEXT \
+   --spring.cloud.stream.kafka.binder.jaas.options.useKeyTab=true \
+   --spring.cloud.stream.kafka.binder.jaas.options.storeKey=true \
+   --spring.cloud.stream.kafka.binder.jaas.options.keyTab=/etc/security/keytabs/kafka_client.keytab \
+   --spring.cloud.stream.kafka.binder.jaas.options.principal=kafka-client-1@EXAMPLE.COM
+----
+
+The preceding example represents the equivalent of the following JAAS file:
+
+[source]
+----
+KafkaClient {
+    com.sun.security.auth.module.Krb5LoginModule required
+    useKeyTab=true
+    storeKey=true
+    keyTab="/etc/security/keytabs/kafka_client.keytab"
+    principal="kafka-client-1@EXAMPLE.COM";
+};
+----
+
+If the topics required already exist on the broker or will be created by an administrator, autocreation can be turned off and only client JAAS properties need to be sent.
+
+NOTE: Do not mix JAAS configuration files and Spring Boot properties in the same application.
+If the `-Djava.security.auth.login.config` system property is already present, Spring Cloud Stream ignores the Spring Boot properties.
+
+NOTE: Be careful when using the `autoCreateTopics` and `autoAddPartitions` with Kerberos.
+Usually, applications may use principals that do not have administrative rights in Kafka and Zookeeper.
+Consequently, relying on Spring Cloud Stream to create/modify topics may fail.
+In secure environments, we strongly recommend creating topics and managing ACLs administratively by using Kafka tooling.
+
+[[pause-resume]]
+===== Example: Pausing and Resuming the Consumer
+
+If you wish to suspend consumption but not cause a partition rebalance, you can pause and resume the consumer.
+This is facilitated by adding the `Consumer` as a parameter to your `@StreamListener`.
+To resume, you need an `ApplicationListener` for `ListenerContainerIdleEvent` instances.
+The frequency at which events are published is controlled by the `idleEventInterval` property.
+Since the consumer is not thread-safe, you must call these methods on the calling thread.
+
+The following simple application shows how to pause and resume:
+
+[source, java]
+----
+@SpringBootApplication
+@EnableBinding(Sink.class)
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+	@StreamListener(Sink.INPUT)
+	public void in(String in, @Header(KafkaHeaders.CONSUMER) Consumer<?, ?> consumer) {
+		System.out.println(in);
+		consumer.pause(Collections.singleton(new TopicPartition("myTopic", 0)));
+	}
+
+	@Bean
+	public ApplicationListener<ListenerContainerIdleEvent> idleListener() {
+		return event -> {
+			System.out.println(event);
+			if (event.getConsumer().paused().size() > 0) {
+				event.getConsumer().resume(event.getConsumer().paused());
+			}
+		};
+	}
+
+}
+----
+
+[[kafka-error-channels]]
+=== Error Channels
+
+Starting with version 1.3, the binder unconditionally sends exceptions to an error channel for each consumer destination and can also be configured to send async producer send failures to an error channel.
+See <<spring-cloud-stream-overview-error-handling>> for more information.
+
+The payload of the `ErrorMessage` for a send failure is a `KafkaSendFailureException` with properties:
+
+* `failedMessage`: The Spring Messaging `Message<?>` that failed to be sent.
+* `record`: The raw `ProducerRecord` that was created from the `failedMessage`
+
+There is no automatic handling of producer exceptions (such as sending to a <<kafka-dlq-processing, Dead-Letter queue>>).
+You can consume these exceptions with your own Spring Integration flow.
+
+[[kafka-metrics]]
+=== Kafka Metrics
+
+Kafka binder module exposes the following metrics:
+
+`spring.cloud.stream.binder.kafka.offset`: This metric indicates how many messages have not been yet consumed from a given binder's topic by a given consumer group.
+The metrics provided are based on the Mircometer metrics library. The metric contains the consumer group information, topic and the actual lag in committed offset from the latest offset on the topic.
+This metric is particularly useful for providing auto-scaling feedback to a PaaS platform.
+
+[[kafka-tombstones]]
+=== Tombstone Records (null record values)
+
+When using compacted topics, a record with a `null` value (also called a tombstone record) represents the deletion of a key.
+To receive such messages in a `@StreamListener` method, the parameter must be marked as not required to receive a `null` value argument.
+
+====
+[source, java]
+----
+@StreamListener(Sink.INPUT)
+public void in(@Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) byte[] key,
+               @Payload(required = false) Customer customer) {
+    // customer is null if a tombstone record
+    ...
+}
+----
+====
+
+[[rebalance-listener]]
+=== Using a KafkaRebalanceListener
+
+Applications may wish to seek topics/partitions to arbitrary offsets when the partitions are initially assigned, or perform other operations on the consumer.
+Starting with version 2.1, if you provide a single `KafkaRebalanceListener` bean in the application context, it will be wired into all Kafka consumer bindings.
+
+====
+[source, java]
+----
+public interface KafkaBindingRebalanceListener {
+
+	/**
+	 * Invoked by the container before any pending offsets are committed.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 */
+	default void onPartitionsRevokedBeforeCommit(String bindingName, Consumer<?, ?> consumer,
+			Collection<TopicPartition> partitions) {
+
+	}
+
+	/**
+	 * Invoked by the container after any pending offsets are committed.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 */
+	default void onPartitionsRevokedAfterCommit(String bindingName, Consumer<?, ?> consumer, Collection<TopicPartition> partitions) {
+
+	}
+
+	/**
+	 * Invoked when partitions are initially assigned or after a rebalance.
+	 * Applications might only want to perform seek operations on an initial assignment.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 * @param initial true if this is the initial assignment.
+	 */
+	default void onPartitionsAssigned(String bindingName, Consumer<?, ?> consumer, Collection<TopicPartition> partitions,
+			boolean initial) {
+
+	}
+
+}
+----
+====
+
+You cannot set the `resetOffsets` consumer property to `true` when you provide a rebalance listener.
+
+= Appendices
+[appendix]
+[[building]]
+== Building
+
+:jdkversion: 1.7
+
+=== Basic Compile and Test
+
+To build the source you will need to install JDK {jdkversion}.
+
+The build uses the Maven wrapper so you don't have to install a specific
+version of Maven. To enable the tests, you should have Kafka server 0.9 or above running
+before building. See below for more information on running the servers.
+
+The main build command is
+
+----
+$ ./mvnw clean install
+----
+
+You can also add '-DskipTests' if you like, to avoid running the tests.
+
+NOTE: You can also install Maven (>=3.3.3) yourself and run the `mvn` command
+in place of `./mvnw` in the examples below. If you do that you also
+might need to add `-P spring` if your local Maven settings do not
+contain repository declarations for spring pre-release artifacts.
+
+NOTE: Be aware that you might need to increase the amount of memory
+available to Maven by setting a `MAVEN_OPTS` environment variable with
+a value like `-Xmx512m -XX:MaxPermSize=128m`. We try to cover this in
+the `.mvn` configuration, so if you find you have to do it to make a
+build succeed, please raise a ticket to get the settings added to
+source control.
+
+
+The projects that require middleware generally include a
+`docker-compose.yml`, so consider using
+http://compose.docker.io/[Docker Compose] to run the middeware servers
+in Docker containers.
+
+=== Documentation
+
+There is a "full" profile that will generate documentation.
+
+=== Working with the code
+If you don't have an IDE preference we would recommend that you use
+http://www.springsource.com/developer/sts[Spring Tools Suite] or
+http://eclipse.org[Eclipse] when working with the code. We use the
+http://eclipse.org/m2e/[m2eclipe] eclipse plugin for maven support. Other IDEs and tools
+should also work without issue.
+
+==== Importing into eclipse with m2eclipse
+We recommend the http://eclipse.org/m2e/[m2eclipe] eclipse plugin when working with
+eclipse. If you don't already have m2eclipse installed it is available from the "eclipse
+marketplace".
+
+Unfortunately m2e does not yet support Maven 3.3, so once the projects
+are imported into Eclipse you will also need to tell m2eclipse to use
+the `.settings.xml` file for the projects.  If you do not do this you
+may see many different errors related to the POMs in the
+projects.  Open your Eclipse preferences, expand the Maven
+preferences, and select User Settings.  In the User Settings field
+click Browse and navigate to the Spring Cloud project you imported
+selecting the `.settings.xml` file in that project.  Click Apply and
+then OK to save the preference changes.
+
+NOTE: Alternatively you can copy the repository settings from https://github.com/spring-cloud/spring-cloud-build/blob/master/.settings.xml[`.settings.xml`] into your own `~/.m2/settings.xml`.
+
+==== Importing into eclipse without m2eclipse
+If you prefer not to use m2eclipse you can generate eclipse project metadata using the
+following command:
+
+[indent=0]
+----
+	$ ./mvnw eclipse:eclipse
+----
+
+The generated eclipse projects can be imported by selecting `import existing projects`
+from the `file` menu.
+[[contributing]
+== Contributing
+
+Spring Cloud is released under the non-restrictive Apache 2.0 license,
+and follows a very standard Github development process, using Github
+tracker for issues and merging pull requests into master. If you want
+to contribute even something trivial please do not hesitate, but
+follow the guidelines below.
+
+=== Sign the Contributor License Agreement
+Before we accept a non-trivial patch or pull request we will need you to sign the
+https://support.springsource.com/spring_committer_signup[contributor's agreement].
+Signing the contributor's agreement does not grant anyone commit rights to the main
+repository, but it does mean that we can accept your contributions, and you will get an
+author credit if we do.  Active contributors might be asked to join the core team, and
+given the ability to merge pull requests.
+
+=== Code Conventions and Housekeeping
+None of these is essential for a pull request, but they will all help.  They can also be
+added after the original pull request but before a merge.
+
+* Use the Spring Framework code format conventions. If you use Eclipse
+  you can import formatter settings using the
+  `eclipse-code-formatter.xml` file from the
+  https://github.com/spring-cloud/build/tree/master/eclipse-coding-conventions.xml[Spring
+  Cloud Build] project. If using IntelliJ, you can use the
+  http://plugins.jetbrains.com/plugin/6546[Eclipse Code Formatter
+  Plugin] to import the same file.
+* Make sure all new `.java` files to have a simple Javadoc class comment with at least an
+  `@author` tag identifying you, and preferably at least a paragraph on what the class is
+  for.
+* Add the ASF license header comment to all new `.java` files (copy from existing files
+  in the project)
+* Add yourself as an `@author` to the .java files that you modify substantially (more
+  than cosmetic changes).
+* Add some Javadocs and, if you change the namespace, some XSD doc elements.
+* A few unit tests would help a lot as well -- someone has to do it.
+* If no-one else is using your branch, please rebase it against the current master (or
+  other target branch in the main project).
+* When writing a commit message please follow http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html[these conventions],
+  if you are fixing an existing issue please add `Fixes gh-XXXX` at the end of the commit
+  message (where XXXX is the issue number).
+
+// ======================================================================================

docs/pom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>spring-cloud-stream-binder-kafka-docs</artifactId>
+	<parent>
+		<groupId>org.springframework.cloud</groupId>
+		<artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
+		<version>2.1.0.RC3</version>
+	</parent>
+	<packaging>pom</packaging>
+	<name>spring-cloud-stream-binder-kafka-docs</name>
+	<description>Spring Cloud Stream Kafka Binder Docs</description>
+	<properties>
+		<docs.main>spring-cloud-stream-binder-kafka</docs.main>
+		<main.basedir>${basedir}/..</main.basedir>
+	</properties>
+
+	<profiles>
+		<profile>
+			<id>docs</id>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-dependency-plugin</artifactId>
+					</plugin>
+					<plugin>
+						<groupId>org.asciidoctor</groupId>
+						<artifactId>asciidoctor-maven-plugin</artifactId>
+						<inherited>false</inherited>
+					</plugin>
+					<plugin>
+						<groupId>com.agilejava.docbkx</groupId>
+						<artifactId>docbkx-maven-plugin</artifactId>
+					</plugin>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-antrun-plugin</artifactId>
+						<inherited>false</inherited>
+					</plugin>
+					<plugin>
+						<groupId>org.codehaus.mojo</groupId>
+						<artifactId>build-helper-maven-plugin</artifactId>
+						<inherited>false</inherited>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
+	</profiles>
+</project>

docs/src/main/asciidoc/README.adoc

@@ -0,0 +1,22 @@
+:jdkversion: 1.8
+:github-tag: master
+:github-repo: spring-cloud/spring-cloud-stream-binder-kafka
+
+:github-raw: https://raw.githubusercontent.com/{github-repo}/{github-tag}
+:github-code: https://github.com/{github-repo}/tree/{github-tag}
+
+image::https://circleci.com/gh/spring-cloud/spring-cloud-stream-binder-kafka.svg?style=svg["CircleCI", link="https://circleci.com/gh/spring-cloud/spring-cloud-stream-binder-kafka"]
+image::https://codecov.io/gh/spring-cloud/spring-cloud-stream-binder-kafka/branch/{github-tag}/graph/badge.svg["codecov", link="https://codecov.io/gh/spring-cloud/spring-cloud-stream-binder-kafka"]
+image::https://badges.gitter.im/spring-cloud/spring-cloud-stream-binder-kafka.svg[Gitter, link="https://gitter.im/spring-cloud/spring-cloud-stream-binder-kafka?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"]
+
+// ======================================================================================
+
+//= Overview
+include::overview.adoc[]
+
+= Appendices
+[appendix]
+include::building.adoc[]
+include::contributing.adoc[]
+
+// ======================================================================================

docs/src/main/asciidoc/dlq.adoc

@@ -0,0 +1,107 @@
+[[kafka-dlq-processing]]
+=== Dead-Letter Topic Processing
+
+Because you cannot anticipate how users would want to dispose of dead-lettered messages, the framework does not provide any standard mechanism to handle them.
+If the reason for the dead-lettering is transient, you may wish to route the messages back to the original topic.
+However, if the problem is a permanent issue, that could cause an infinite loop.
+The sample Spring Boot application within this topic is an example of how to route those messages back to the original topic, but it moves them to a "`parking lot`" topic after three attempts.
+The application is another spring-cloud-stream application that reads from the dead-letter topic.
+It terminates when no messages are received for 5 seconds.
+
+The examples assume the original destination is `so8400out` and the consumer group is `so8400`.
+
+There are a couple of strategies to consider:
+
+* Consider running the rerouting only when the main application is not running.
+Otherwise, the retries for transient errors are used up very quickly.
+* Alternatively, use a two-stage approach: Use this application to route to a third topic and another to route from there back to the main topic.
+
+The following code listings show the sample application:
+
+.application.properties
+[source]
+----
+spring.cloud.stream.bindings.input.group=so8400replay
+spring.cloud.stream.bindings.input.destination=error.so8400out.so8400
+
+spring.cloud.stream.bindings.output.destination=so8400out
+spring.cloud.stream.bindings.output.producer.partitioned=true
+
+spring.cloud.stream.bindings.parkingLot.destination=so8400in.parkingLot
+spring.cloud.stream.bindings.parkingLot.producer.partitioned=true
+
+spring.cloud.stream.kafka.binder.configuration.auto.offset.reset=earliest
+
+spring.cloud.stream.kafka.binder.headers=x-retries
+----
+
+.Application
+[source, java]
+----
+@SpringBootApplication
+@EnableBinding(TwoOutputProcessor.class)
+public class ReRouteDlqKApplication implements CommandLineRunner {
+
+    private static final String X_RETRIES_HEADER = "x-retries";
+
+    public static void main(String[] args) {
+        SpringApplication.run(ReRouteDlqKApplication.class, args).close();
+    }
+
+    private final AtomicInteger processed = new AtomicInteger();
+
+    @Autowired
+    private MessageChannel parkingLot;
+
+    @StreamListener(Processor.INPUT)
+    @SendTo(Processor.OUTPUT)
+    public Message<?> reRoute(Message<?> failed) {
+        processed.incrementAndGet();
+        Integer retries = failed.getHeaders().get(X_RETRIES_HEADER, Integer.class);
+        if (retries == null) {
+            System.out.println("First retry for " + failed);
+            return MessageBuilder.fromMessage(failed)
+                    .setHeader(X_RETRIES_HEADER, new Integer(1))
+                    .setHeader(BinderHeaders.PARTITION_OVERRIDE,
+                            failed.getHeaders().get(KafkaHeaders.RECEIVED_PARTITION_ID))
+                    .build();
+        }
+        else if (retries.intValue() < 3) {
+            System.out.println("Another retry for " + failed);
+            return MessageBuilder.fromMessage(failed)
+                    .setHeader(X_RETRIES_HEADER, new Integer(retries.intValue() + 1))
+                    .setHeader(BinderHeaders.PARTITION_OVERRIDE,
+                            failed.getHeaders().get(KafkaHeaders.RECEIVED_PARTITION_ID))
+                    .build();
+        }
+        else {
+            System.out.println("Retries exhausted for " + failed);
+            parkingLot.send(MessageBuilder.fromMessage(failed)
+                    .setHeader(BinderHeaders.PARTITION_OVERRIDE,
+                            failed.getHeaders().get(KafkaHeaders.RECEIVED_PARTITION_ID))
+                    .build());
+        }
+        return null;
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        while (true) {
+            int count = this.processed.get();
+            Thread.sleep(5000);
+            if (count == this.processed.get()) {
+                System.out.println("Idle, terminating");
+                return;
+            }
+        }
+    }
+
+    public interface TwoOutputProcessor extends Processor {
+
+        @Output("parkingLot")
+        MessageChannel parkingLot();
+
+    }
+
+}
+----

docs/src/main/asciidoc/ghpages.sh

@@ -0,0 +1,330 @@
+#!/bin/bash -x
+
+set -e
+
+# Set default props like MAVEN_PATH, ROOT_FOLDER etc.
+function set_default_props() {
+    # The script should be executed from the root folder
+    ROOT_FOLDER=`pwd`
+    echo "Current folder is ${ROOT_FOLDER}"
+
+    if [[ ! -e "${ROOT_FOLDER}/.git" ]]; then
+        echo "You're not in the root folder of the project!"
+        exit 1
+    fi
+
+    # Prop that will let commit the changes
+    COMMIT_CHANGES="no"
+    MAVEN_PATH=${MAVEN_PATH:-}
+    echo "Path to Maven is [${MAVEN_PATH}]"
+    REPO_NAME=${PWD##*/}
+    echo "Repo name is [${REPO_NAME}]"
+    SPRING_CLOUD_STATIC_REPO=${SPRING_CLOUD_STATIC_REPO:-git@github.com:spring-cloud/spring-cloud-static.git}
+    echo "Spring Cloud Static repo is [${SPRING_CLOUD_STATIC_REPO}"
+}
+
+# Check if gh-pages exists and docs have been built
+function check_if_anything_to_sync() {
+    git remote set-url --push origin `git config remote.origin.url | sed -e 's/^git:/https:/'`
+
+    if ! (git remote set-branches --add origin gh-pages && git fetch -q); then
+        echo "No gh-pages, so not syncing"
+        exit 0
+    fi
+
+    if ! [ -d docs/target/generated-docs ] && ! [ "${BUILD}" == "yes" ]; then
+        echo "No gh-pages sources in docs/target/generated-docs, so not syncing"
+        exit 0
+    fi
+}
+
+function retrieve_current_branch() {
+    # Code getting the name of the current branch. For master we want to publish as we did until now
+    # http://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch
+    # If there is a branch already passed will reuse it - otherwise will try to find it
+    CURRENT_BRANCH=${BRANCH}
+    if [[ -z "${CURRENT_BRANCH}" ]] ; then
+      CURRENT_BRANCH=$(git symbolic-ref -q HEAD)
+      CURRENT_BRANCH=${CURRENT_BRANCH##refs/heads/}
+      CURRENT_BRANCH=${CURRENT_BRANCH:-HEAD}
+    fi
+    echo "Current branch is [${CURRENT_BRANCH}]"
+    git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
+}
+
+# Switches to the provided value of the release version. We always prefix it with `v`
+function switch_to_tag() {
+    git checkout v${VERSION}
+}
+
+# Build the docs if switch is on
+function build_docs_if_applicable() {
+    if [[ "${BUILD}" == "yes" ]] ; then
+        ./mvnw clean install -P docs -pl docs -DskipTests
+    fi
+}
+
+# Get the name of the `docs.main` property
+# Get whitelisted branches - assumes that a `docs` module is available under `docs` profile
+function retrieve_doc_properties() {
+    MAIN_ADOC_VALUE=$("${MAVEN_PATH}"mvn -q \
+        -Dexec.executable="echo" \
+        -Dexec.args='${docs.main}' \
+        --non-recursive \
+        org.codehaus.mojo:exec-maven-plugin:1.3.1:exec)
+    echo "Extracted 'main.adoc' from Maven build [${MAIN_ADOC_VALUE}]"
+
+
+    WHITELIST_PROPERTY=${WHITELIST_PROPERTY:-"docs.whitelisted.branches"}
+    WHITELISTED_BRANCHES_VALUE=$("${MAVEN_PATH}"mvn -q \
+        -Dexec.executable="echo" \
+        -Dexec.args="\${${WHITELIST_PROPERTY}}" \
+        org.codehaus.mojo:exec-maven-plugin:1.3.1:exec \
+        -P docs \
+        -pl docs)
+    echo "Extracted '${WHITELIST_PROPERTY}' from Maven build [${WHITELISTED_BRANCHES_VALUE}]"
+}
+
+# Stash any outstanding changes
+function stash_changes() {
+    git diff-index --quiet HEAD && dirty=$? || (echo "Failed to check if the current repo is dirty. Assuming that it is." && dirty="1")
+    if [ "$dirty" != "0" ]; then git stash; fi
+}
+
+# Switch to gh-pages branch to sync it with current branch
+function add_docs_from_target() {
+    local DESTINATION_REPO_FOLDER
+    if [[ -z "${DESTINATION}" && -z "${CLONE}" ]] ; then
+        DESTINATION_REPO_FOLDER=${ROOT_FOLDER}
+    elif [[ "${CLONE}" == "yes" ]]; then
+        mkdir -p ${ROOT_FOLDER}/target
+        local clonedStatic=${ROOT_FOLDER}/target/spring-cloud-static
+        if [[ ! -e "${clonedStatic}/.git" ]]; then
+            echo "Cloning Spring Cloud Static to target"
+            git clone ${SPRING_CLOUD_STATIC_REPO} ${clonedStatic} && git checkout gh-pages
+        else
+            echo "Spring Cloud Static already cloned - will pull changes"
+            cd ${clonedStatic} && git checkout gh-pages && git pull origin gh-pages
+        fi
+        DESTINATION_REPO_FOLDER=${clonedStatic}/${REPO_NAME}
+        mkdir -p ${DESTINATION_REPO_FOLDER}
+    else
+        if [[ ! -e "${DESTINATION}/.git" ]]; then
+            echo "[${DESTINATION}] is not a git repository"
+            exit 1
+        fi
+        DESTINATION_REPO_FOLDER=${DESTINATION}/${REPO_NAME}
+        mkdir -p ${DESTINATION_REPO_FOLDER}
+        echo "Destination was provided [${DESTINATION}]"
+    fi
+    cd ${DESTINATION_REPO_FOLDER}
+    git checkout gh-pages
+    git pull origin gh-pages
+
+    # Add git branches
+    ###################################################################
+    if [[ -z "${VERSION}" ]] ; then
+        copy_docs_for_current_version
+    else
+        copy_docs_for_provided_version
+    fi
+    commit_changes_if_applicable
+}
+
+
+# Copies the docs by using the retrieved properties from Maven build
+function copy_docs_for_current_version() {
+    if [[ "${CURRENT_BRANCH}" == "master" ]] ; then
+        echo -e "Current branch is master - will copy the current docs only to the root folder"
+        for f in docs/target/generated-docs/*; do
+            file=${f#docs/target/generated-docs/*}
+            if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
+                # Not ignored...
+                cp -rf $f ${ROOT_FOLDER}/
+                git add -A ${ROOT_FOLDER}/$file
+            fi
+        done
+        COMMIT_CHANGES="yes"
+    else
+        echo -e "Current branch is [${CURRENT_BRANCH}]"
+        # http://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin
+        if [[ ",${WHITELISTED_BRANCHES_VALUE}," = *",${CURRENT_BRANCH},"* ]] ; then
+            mkdir -p ${ROOT_FOLDER}/${CURRENT_BRANCH}
+            echo -e "Branch [${CURRENT_BRANCH}] is whitelisted! Will copy the current docs to the [${CURRENT_BRANCH}] folder"
+            for f in docs/target/generated-docs/*; do
+                file=${f#docs/target/generated-docs/*}
+                if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
+                    # Not ignored...
+                    # We want users to access 2.0.0.BUILD-SNAPSHOT/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
+                    if [[ "${file}" == "${MAIN_ADOC_VALUE}.html" ]] ; then
+                        # We don't want to copy the spring-cloud-sleuth.html
+                        # we want it to be converted to index.html
+                        cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
+                        git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
+                    else
+                        cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}
+                        git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/$file
+                    fi
+                fi
+            done
+            COMMIT_CHANGES="yes"
+        else
+            echo -e "Branch [${CURRENT_BRANCH}] is not on the white list! Check out the Maven [${WHITELIST_PROPERTY}] property in
+             [docs] module available under [docs] profile. Won't commit any changes to gh-pages for this branch."
+        fi
+    fi
+}
+
+# Copies the docs by using the explicitly provided version
+function copy_docs_for_provided_version() {
+    local FOLDER=${DESTINATION_REPO_FOLDER}/${VERSION}
+    mkdir -p ${FOLDER}
+    echo -e "Current tag is [v${VERSION}] Will copy the current docs to the [${FOLDER}] folder"
+    for f in ${ROOT_FOLDER}/docs/target/generated-docs/*; do
+        file=${f#${ROOT_FOLDER}/docs/target/generated-docs/*}
+        copy_docs_for_branch ${file} ${FOLDER}
+    done
+    COMMIT_CHANGES="yes"
+    CURRENT_BRANCH="v${VERSION}"
+}
+
+# Copies the docs from target to the provided destination
+# Params:
+# $1 - file from target
+# $2 - destination to which copy the files
+function copy_docs_for_branch() {
+    local file=$1
+    local destination=$2
+    if ! git ls-files -i -o --exclude-standard --directory | grep -q ^${file}$; then
+        # Not ignored...
+        # We want users to access 2.0.0.BUILD-SNAPSHOT/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
+        if [[ ("${file}" == "${MAIN_ADOC_VALUE}.html") || ("${file}" == "${REPO_NAME}.html") ]] ; then
+            # We don't want to copy the spring-cloud-sleuth.html
+            # we want it to be converted to index.html
+            cp -rf $f ${destination}/index.html
+            git add -A ${destination}/index.html
+        else
+            cp -rf $f ${destination}
+            git add -A ${destination}/$file
+        fi
+    fi
+}
+
+function commit_changes_if_applicable() {
+    if [[ "${COMMIT_CHANGES}" == "yes" ]] ; then
+        COMMIT_SUCCESSFUL="no"
+        git commit -a -m "Sync docs from ${CURRENT_BRANCH} to gh-pages" && COMMIT_SUCCESSFUL="yes" || echo "Failed to commit changes"
+
+        # Uncomment the following push if you want to auto push to
+        # the gh-pages branch whenever you commit to master locally.
+        # This is a little extreme. Use with care!
+        ###################################################################
+        if [[ "${COMMIT_SUCCESSFUL}" == "yes" ]] ; then
+            git push origin gh-pages
+        fi
+    fi
+}
+
+# Switch back to the previous branch and exit block
+function checkout_previous_branch() {
+    # If -version was provided we need to come back to root project
+    cd ${ROOT_FOLDER}
+    git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
+    if [ "$dirty" != "0" ]; then git stash pop; fi
+    exit 0
+}
+
+# Assert if properties have been properly passed
+function assert_properties() {
+echo "VERSION [${VERSION}], DESTINATION [${DESTINATION}], CLONE [${CLONE}]"
+if [[ "${VERSION}" != "" && (-z "${DESTINATION}" && -z "${CLONE}") ]] ; then echo "Version was set but destination / clone was not!"; exit 1;fi
+if [[ ("${DESTINATION}" != "" && "${CLONE}" != "") && -z "${VERSION}" ]] ; then echo "Destination / clone was set but version was not!"; exit 1;fi
+if [[ "${DESTINATION}" != "" && "${CLONE}" == "yes" ]] ; then echo "Destination and clone was set. Pick one!"; exit 1;fi
+}
+
+# Prints the usage
+function print_usage() {
+cat <<EOF
+The idea of this script is to update gh-pages branch with the generated docs. Without any options
+the script will work in the following manner:
+
+- if there's no gh-pages / target for docs module then the script ends
+- for master branch the generated docs are copied to the root of gh-pages branch
+- for any other branch (if that branch is whitelisted) a subfolder with branch name is created
+    and docs are copied there
+- if the version switch is passed (-v) then a tag with (v) prefix will be retrieved and a folder
+    with that version number will be created in the gh-pages branch. WARNING! No whitelist verification will take place
+- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
+    switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
+- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
+    switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
+
+USAGE:
+
+You can use the following options:
+
+-v|--version        - the script will apply the whole procedure for a particular library version
+-d|--destination    - the root of destination folder where the docs should be copied. You have to use the full path.
+                        E.g. point to spring-cloud-static folder. Can't be used with (-c)
+-b|--build          - will run the standard build process after checking out the branch
+-c|--clone          - will automatically clone the spring-cloud-static repo instead of providing the destination.
+                        Obviously can't be used with (-d)
+
+EOF
+}
+
+
+# ==========================================
+#    ____   ____ _____  _____ _____ _______
+#  / ____|/ ____|  __ \|_   _|  __ \__   __|
+# | (___ | |    | |__) | | | | |__) | | |
+#  \___ \| |    |  _  /  | | |  ___/  | |
+#  ____) | |____| | \ \ _| |_| |      | |
+# |_____/ \_____|_|  \_\_____|_|      |_|
+#
+# ==========================================
+
+while [[ $# > 0 ]]
+do
+key="$1"
+case ${key} in
+    -v|--version)
+    VERSION="$2"
+    shift # past argument
+    ;;
+    -d|--destination)
+    DESTINATION="$2"
+    shift # past argument
+    ;;
+    -b|--build)
+    BUILD="yes"
+    ;;
+    -c|--clone)
+    CLONE="yes"
+    ;;
+    -h|--help)
+    print_usage
+    exit 0
+    ;;
+    *)
+    echo "Invalid option: [$1]"
+    print_usage
+    exit 1
+    ;;
+esac
+shift # past argument or value
+done
+
+assert_properties
+set_default_props
+check_if_anything_to_sync
+if [[ -z "${VERSION}" ]] ; then
+    retrieve_current_branch
+else
+    switch_to_tag
+fi
+build_docs_if_applicable
+retrieve_doc_properties
+stash_changes
+add_docs_from_target
+checkout_previous_branch

docs/src/main/asciidoc/kafka-streams.adoc

@@ -0,0 +1,695 @@
+== Kafka Streams Binder
+
+=== Usage
+
+For using the Kafka Streams binder, you just need to add it to your Spring Cloud Stream application, using the following
+Maven coordinates:
+
+[source,xml]
+----
+<dependency>
+  <groupId>org.springframework.cloud</groupId>
+  <artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
+</dependency>
+----
+
+
+=== Overview
+
+Spring Cloud Stream's Apache Kafka support also includes a binder implementation designed explicitly for Apache Kafka
+Streams binding. With this native integration, a Spring Cloud Stream "processor" application can directly use the
+https://kafka.apache.org/documentation/streams/developer-guide[Apache Kafka Streams] APIs in the core business logic.
+
+Kafka Streams binder implementation builds on the foundation provided by the http://docs.spring.io/spring-kafka/reference/html/_reference.html#kafka-streams[Kafka Streams in Spring Kafka]
+project.
+
+Kafka Streams binder provides binding capabilities for the three major types in Kafka Streams - KStream, KTable and GlobalKTable.
+
+As part of this native integration, the high-level https://docs.confluent.io/current/streams/developer-guide/dsl-api.html[Streams DSL]
+provided by the Kafka Streams API is available for use in the business logic.
+
+An early version of the https://docs.confluent.io/current/streams/developer-guide/processor-api.html[Processor API]
+support is available as well.
+
+As noted early-on, Kafka Streams support in Spring Cloud Stream is strictly only available for use in the Processor model.
+A model in which the messages read from an inbound topic, business processing can be applied, and the transformed messages
+can be written to an outbound topic. It can also be used in Processor applications with a no-outbound destination.
+
+==== Streams DSL
+
+This application consumes data from a Kafka topic (e.g., `words`), computes word count for each unique word in a 5 seconds
+time window, and the computed results are sent to a downstream topic (e.g., `counts`) for further processing.
+
+[source]
+----
+@SpringBootApplication
+@EnableBinding(KStreamProcessor.class)
+public class WordCountProcessorApplication {
+
+	@StreamListener("input")
+	@SendTo("output")
+	public KStream<?, WordCount> process(KStream<?, String> input) {
+		return input
+                .flatMapValues(value -> Arrays.asList(value.toLowerCase().split("\\W+")))
+                .groupBy((key, value) -> value)
+                .windowedBy(TimeWindows.of(5000))
+                .count(Materialized.as("WordCounts-multi"))
+                .toStream()
+                .map((key, value) -> new KeyValue<>(null, new WordCount(key.key(), value, new Date(key.window().start()), new Date(key.window().end()))));
+    }
+
+	public static void main(String[] args) {
+		SpringApplication.run(WordCountProcessorApplication.class, args);
+	}
+----
+
+Once built as a uber-jar (e.g., `wordcount-processor.jar`), you can run the above example like the following.
+
+[source]
+----
+java -jar wordcount-processor.jar  --spring.cloud.stream.bindings.input.destination=words --spring.cloud.stream.bindings.output.destination=counts
+----
+
+This application will consume messages from the Kafka topic `words` and the computed results are published to an output
+topic `counts`.
+
+Spring Cloud Stream will ensure that the messages from both the incoming and outgoing topics are automatically bound as
+KStream objects. As a developer, you can exclusively focus on the business aspects of the code, i.e. writing the logic
+required in the processor. Setting up the Streams DSL specific configuration required by the Kafka Streams infrastructure
+is automatically handled by the framework.
+
+=== Configuration Options
+
+This section contains the configuration options used by the Kafka Streams binder.
+
+For common configuration options and properties pertaining to binder, refer to the <<binding-properties,core documentation>>.
+
+==== Kafka Streams Properties
+
+The following properties are available at the binder level and must be prefixed with `spring.cloud.stream.kafka.streams.binder.`
+
+configuration::
+  Map with a key/value pair containing properties pertaining to Apache Kafka Streams API.
+  This property must be prefixed with `spring.cloud.stream.kafka.streams.binder.`.
+ Following are some examples of using this property.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
+spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
+spring.cloud.stream.kafka.streams.binder.configuration.commit.interval.ms=1000
+----
+
+For more information about all the properties that may go into streams configuration, see StreamsConfig JavaDocs in
+Apache Kafka Streams docs.
+
+brokers::
+ Broker URL
++
+Default: `localhost`
+zkNodes::
+ Zookeeper URL
++
+Default: `localhost`
+serdeError::
+ Deserialization error handler type.
+ Possible values are - `logAndContinue`, `logAndFail` or `sendToDlq`
++
+Default: `logAndFail`
+applicationId::
+ Convenient way to set the application.id for the Kafka Streams application globally at the binder level.
+ If the application contains multiple `StreamListener` methods, then application.id should be set at the binding level per input binding.
++
+Default: `none`
+
+The following properties are _only_ available for Kafka Streams producers and must be prefixed with `spring.cloud.stream.kafka.streams.bindings.<binding name>.producer.`
+For convenience, if there multiple output bindings and they all require a common value, that can be configured by using the prefix `spring.cloud.stream.kafka.streams.default.producer.`.
+
+keySerde::
+  key serde to use
++
+Default: `none`.
+valueSerde::
+  value serde to use
++
+Default: `none`.
+useNativeEncoding::
+  flag to enable native encoding
++
+Default: `false`.
+
+The following properties are available for Kafka Streams consumers and must be prefixed with `spring.cloud.stream.kafka.streams.bindings.<binding-name>.consumer.`
+For convenience, if there are multiple input bindings and they all require a common value, that can be configured by using the prefix `spring.cloud.stream.kafka.streams.default.consumer.`.
+
+applicationId::
+ Setting application.id per input binding.
++
+Default: `none`
+keySerde::
+  key serde to use
++
+Default: `none`.
+valueSerde::
+  value serde to use
++
+Default: `none`.
+materializedAs::
+  state store to materialize when using incoming KTable types
++
+Default: `none`.
+useNativeDecoding::
+  flag to enable native decoding
++
+Default: `false`.
+dlqName::
+  DLQ topic name.
++
+Default: `none`.
+startOffset::
+  Offset to start from if there is no committed offset to consume from.
+  This is mostly used when the consumer is consuming from a topic for the first time. Kafka Streams uses `earliest` as the default strategy and
+  the binder uses the same default. This can be overridden to `latest` using this property.
++
+Default: `earliest`.
+
+Note: Using `resetOffsets` on the consumer does not have any effect on Kafka Streams binder.
+Unlike the message channel based binder, Kafka Streams binder does not seek to beginning or end on demand.
+
+==== TimeWindow properties:
+
+Windowing is an important concept in stream processing applications. Following properties are available to configure
+time-window computations.
+
+spring.cloud.stream.kafka.streams.timeWindow.length::
+  When this property is given, you can autowire a `TimeWindows` bean into the application.
+  The value is expressed in milliseconds.
++
+Default: `none`.
+spring.cloud.stream.kafka.streams.timeWindow.advanceBy::
+  Value is given in milliseconds.
++
+Default: `none`.
+
+=== Multiple Input Bindings
+
+For use cases that requires multiple incoming KStream objects or a combination of KStream and KTable objects, the Kafka
+Streams binder provides multiple bindings support.
+
+Let's see it in action.
+
+==== Multiple Input Bindings as a Sink
+
+[source]
+----
+@EnableBinding(KStreamKTableBinding.class)
+.....
+.....
+@StreamListener
+public void process(@Input("inputStream") KStream<String, PlayEvent> playEvents,
+                    @Input("inputTable") KTable<Long, Song> songTable) {
+                    ....
+                    ....
+}
+
+interface KStreamKTableBinding {
+
+    @Input("inputStream")
+    KStream<?, ?> inputStream();
+
+    @Input("inputTable")
+    KTable<?, ?> inputTable();
+}
+
+----
+
+In the above example, the application is written as a sink, i.e. there are no output bindings and the application has to
+decide concerning downstream processing. When you write applications in this style, you might want to send the information
+downstream or store them in a state store (See below for Queryable State Stores).
+
+In the case of incoming KTable, if you want to materialize the computations to a state store, you have to express it
+through the following property.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.inputTable.consumer.materializedAs: all-songs
+----
+
+The above example shows the use of KTable as an input binding.
+The binder also supports input bindings for GlobalKTable.
+GlobalKTable binding is useful when you have to ensure that all instances of your application has access to the data updates from the topic.
+KTable and GlobalKTable bindings are only available on the input.
+Binder supports both input and output bindings for KStream.
+
+=== Multiple Input Bindings as a Processor
+
+[source]
+----
+@EnableBinding(KStreamKTableBinding.class)
+....
+....
+
+@StreamListener
+@SendTo("output")
+public KStream<String, Long> process(@Input("input") KStream<String, Long> userClicksStream,
+                                     @Input("inputTable") KTable<String, String> userRegionsTable) {
+....
+....
+}
+
+interface KStreamKTableBinding extends KafkaStreamsProcessor {
+
+    @Input("inputX")
+    KTable<?, ?> inputTable();
+}
+
+----
+
+=== Multiple Output Bindings (aka Branching)
+
+Kafka Streams allow outbound data to be split into multiple topics based on some predicates. The Kafka Streams binder provides
+support for this feature without compromising the programming model exposed through `StreamListener` in the end user application.
+
+You can write the application in the usual way as demonstrated above in the word count example. However, when using the
+branching feature, you are required to do a few things. First, you need to make sure that your return type is `KStream[]`
+instead of a regular `KStream`. Second, you need to use the `SendTo` annotation containing the output bindings in the order
+(see example below). For each of these output bindings, you need to configure destination, content-type etc., complying with
+the standard Spring Cloud Stream expectations.
+
+Here is an example:
+
+[source]
+----
+@EnableBinding(KStreamProcessorWithBranches.class)
+@EnableAutoConfiguration
+public static class WordCountProcessorApplication {
+
+    @Autowired
+    private TimeWindows timeWindows;
+
+    @StreamListener("input")
+    @SendTo({"output1","output2","output3})
+    public KStream<?, WordCount>[] process(KStream<Object, String> input) {
+
+			Predicate<Object, WordCount> isEnglish = (k, v) -> v.word.equals("english");
+			Predicate<Object, WordCount> isFrench =  (k, v) -> v.word.equals("french");
+			Predicate<Object, WordCount> isSpanish = (k, v) -> v.word.equals("spanish");
+
+			return input
+					.flatMapValues(value -> Arrays.asList(value.toLowerCase().split("\\W+")))
+					.groupBy((key, value) -> value)
+					.windowedBy(timeWindows)
+					.count(Materialized.as("WordCounts-1"))
+					.toStream()
+					.map((key, value) -> new KeyValue<>(null, new WordCount(key.key(), value, new Date(key.window().start()), new Date(key.window().end()))))
+					.branch(isEnglish, isFrench, isSpanish);
+    }
+
+    interface KStreamProcessorWithBranches {
+
+    		@Input("input")
+    		KStream<?, ?> input();
+
+    		@Output("output1")
+    		KStream<?, ?> output1();
+
+    		@Output("output2")
+    		KStream<?, ?> output2();
+
+    		@Output("output3")
+    		KStream<?, ?> output3();
+    	}
+}
+----
+
+Properties:
+
+[source]
+----
+spring.cloud.stream.bindings.output1.contentType: application/json
+spring.cloud.stream.bindings.output2.contentType: application/json
+spring.cloud.stream.bindings.output3.contentType: application/json
+spring.cloud.stream.kafka.streams.binder.configuration.commit.interval.ms: 1000
+spring.cloud.stream.kafka.streams.binder.configuration:
+  default.key.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
+  default.value.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
+spring.cloud.stream.bindings.output1:
+  destination: foo
+  producer:
+    headerMode: raw
+spring.cloud.stream.bindings.output2:
+  destination: bar
+  producer:
+    headerMode: raw
+spring.cloud.stream.bindings.output3:
+  destination: fox
+  producer:
+    headerMode: raw
+spring.cloud.stream.bindings.input:
+  destination: words
+  consumer:
+    headerMode: raw
+----
+
+=== Record Value Conversion
+
+Kafka Streams binder can marshal producer/consumer values based on a content type and the converters provided out of the box in Spring Cloud Stream.
+
+It is typical for Kafka Streams applications to provide `Serde` classes.
+Therefore, it may be more natural to rely on the SerDe facilities provided by the Apache Kafka Streams library itself for data conversion on inbound and outbound
+rather than rely on the content-type conversions offered by the binder.
+On the other hand, you might be already familiar with the content-type conversion patterns provided by Spring Cloud Stream and
+would like to continue using that for inbound and outbound conversions.
+
+Both the options are supported in the Kafka Streams binder implementation. See below for more details.
+
+===== Outbound serialization
+
+If native encoding is disabled (which is the default), then the framework will convert the message using the contentType
+set by the user (otherwise, the default `application/json` will be applied). It will ignore any SerDe set on the outbound
+in this case for outbound serialization.
+
+Here is the property to set the contentType on the outbound.
+
+[source]
+----
+spring.cloud.stream.bindings.output.contentType: application/json
+----
+
+Here is the property to enable native encoding.
+
+[source]
+----
+spring.cloud.stream.bindings.output.nativeEncoding: true
+----
+
+If native encoding is enabled on the output binding (user has to enable it as above explicitly), then the framework will
+skip any form of automatic message conversion on the outbound. In that case, it will switch to the Serde set by the user.
+The `valueSerde` property set on the actual output binding will be used. Here is an example.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.output.producer.valueSerde: org.apache.kafka.common.serialization.Serdes$StringSerde
+----
+If this property is not set, then it will use the "default" SerDe: `spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde`.
+
+It is worth to mention that Kafka Streams binder does not serialize the keys on outbound - it simply relies on Kafka itself.
+Therefore, you either have to specify the `keySerde` property on the binding or it will default to the application-wide common
+`keySerde`.
+
+Binding level key serde:
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.output.producer.keySerde
+----
+
+Common Key serde:
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde
+----
+
+If branching is used, then you need to use multiple output bindings. For example,
+
+[source]
+----
+interface KStreamProcessorWithBranches {
+
+    		@Input("input")
+    		KStream<?, ?> input();
+
+    		@Output("output1")
+    		KStream<?, ?> output1();
+
+    		@Output("output2")
+    		KStream<?, ?> output2();
+
+    		@Output("output3")
+    		KStream<?, ?> output3();
+    	}
+----
+
+If `nativeEncoding` is set, then you can set different SerDe's on individual output bindings as below.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.output1.producer.valueSerde=IntegerSerde
+spring.cloud.stream.kafka.streams.bindings.output2.producer.valueSerde=StringSerde
+spring.cloud.stream.kafka.streams.bindings.output3.producer.valueSerde=JsonSerde
+----
+
+Then if you have `SendTo` like this, @SendTo({"output1", "output2", "output3"}), the `KStream[]` from the branches are
+applied with proper SerDe objects as defined above. If you are not enabling `nativeEncoding`, you can then set different
+contentType values on the output bindings as below. In that case, the framework will use the appropriate message converter
+to convert the messages before sending to Kafka.
+
+[source]
+----
+spring.cloud.stream.bindings.output1.contentType: application/json
+spring.cloud.stream.bindings.output2.contentType: application/java-serialzied-object
+spring.cloud.stream.bindings.output3.contentType: application/octet-stream
+----
+
+===== Inbound Deserialization
+
+Similar rules apply to data deserialization on the inbound.
+
+If native decoding is disabled (which is the default), then the framework will convert the message using the contentType
+set by the user (otherwise, the default `application/json` will be applied). It will ignore any SerDe set on the inbound
+in this case for inbound deserialization.
+
+Here is the property to set the contentType on the inbound.
+
+[source]
+----
+spring.cloud.stream.bindings.input.contentType: application/json
+----
+
+Here is the property to enable native decoding.
+
+[source]
+----
+spring.cloud.stream.bindings.input.nativeDecoding: true
+----
+
+If native decoding is enabled on the input binding (user has to enable it as above explicitly), then the framework will
+skip doing any message conversion on the inbound. In that case, it will switch to the SerDe set by the user. The `valueSerde`
+property set on the actual output binding will be used. Here is an example.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.input.consumer.valueSerde: org.apache.kafka.common.serialization.Serdes$StringSerde
+----
+
+If this property is not set, it will use the default SerDe: `spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde`.
+
+It is worth to mention that Kafka Streams binder does not deserialize the keys on inbound - it simply relies on Kafka itself.
+Therefore, you either have to specify the `keySerde` property on the binding or it will default to the application-wide common
+`keySerde`.
+
+Binding level key serde:
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.input.consumer.keySerde
+----
+
+Common Key serde:
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde
+----
+
+As in the case of KStream branching on the outbound, the benefit of setting value SerDe per binding is that if you have
+multiple input bindings (multiple KStreams object) and they all require separate value SerDe's, then you can configure
+them individually. If you use the common configuration approach, then this feature won't be applicable.
+
+=== Error Handling
+
+Apache Kafka Streams provide the capability for natively handling exceptions from deserialization errors.
+For details on this support, please see https://cwiki.apache.org/confluence/display/KAFKA/KIP-161%3A+streams+deserialization+exception+handlers[this]
+Out of the box, Apache Kafka Streams provide two kinds of deserialization exception handlers - `logAndContinue` and `logAndFail`.
+As the name indicates, the former will log the error and continue processing the next records and the latter will log the
+error and fail. `LogAndFail` is the default deserialization exception handler.
+
+=== Handling Deserialization Exceptions
+
+Kafka Streams binder supports a selection of exception handlers through the following properties.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.serdeError: logAndContinue
+----
+
+In addition to the above two deserialization exception handlers, the binder also provides a third one for sending the erroneous
+records (poison pills) to a DLQ topic. Here is how you enable this DLQ exception handler.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.serdeError: sendToDlq
+----
+When the above property is set, all the deserialization error records are automatically sent to the DLQ topic.
+
+[source]
+----
+spring.cloud.stream.kafka.streams.bindings.input.consumer.dlqName: foo-dlq
+----
+
+If this is set, then the error records are sent to the topic `foo-dlq`. If this is not set, then it will create a DLQ
+topic with the name `error.<input-topic-name>.<group-name>`.
+
+A couple of things to keep in mind when using the exception handling feature in Kafka Streams binder.
+
+* The property `spring.cloud.stream.kafka.streams.binder.serdeError` is applicable for the entire application. This implies
+that if there are multiple `StreamListener` methods in the same application, this property is applied to all of them.
+* The exception handling for deserialization works consistently with native deserialization and framework provided message
+conversion.
+
+==== Handling Non-Deserialization Exceptions
+
+For general error handling in Kafka Streams binder, it is up to the end user applications to handle application level errors.
+As a side effect of providing a DLQ for deserialization exception handlers, Kafka Streams binder provides a way to get
+access to the DLQ sending bean directly from your application.
+Once you get access to that bean, you can programmatically send any exception records from your application to the DLQ.
+
+It continues to remain hard to robust error handling using the high-level DSL; Kafka Streams doesn't natively support error
+handling yet.
+
+However, when you use the low-level Processor API in your application, there are options to control this behavior. See
+below.
+
+[source]
+----
+@Autowired
+private SendToDlqAndContinue dlqHandler;
+
+@StreamListener("input")
+@SendTo("output")
+public KStream<?, WordCount> process(KStream<Object, String> input) {
+
+    input.process(() -> new Processor() {
+    			ProcessorContext context;
+
+    			@Override
+    			public void init(ProcessorContext context) {
+    				this.context = context;
+    			}
+
+    			@Override
+    			public void process(Object o, Object o2) {
+
+    			    try {
+    			        .....
+    			        .....
+    			    }
+    			    catch(Exception e) {
+    			        //explicitly provide the kafka topic corresponding to the input binding as the first argument.
+                        //DLQ handler will correctly map to the dlq topic from the actual incoming destination.
+                        dlqHandler.sendToDlq("topic-name", (byte[]) o1, (byte[]) o2, context.partition());
+    			    }
+    			}
+
+    			.....
+    			.....
+    });
+}
+----
+
+=== State Store
+
+State store is created automatically by Kafka Streams when the DSL is used.
+When processor API is used, you need to register a state store manually. In order to do so, you can use `KafkaStreamsStateStore` annotation.
+You can specify the name and type of the store, flags to control log and disabling cache, etc.
+Once the store is created by the binder during the bootstrapping phase, you can access this state store through the processor API.
+Below are some primitives for doing this.
+
+Creating a state store:
+[source]
+----
+@KafkaStreamsStateStore(name="mystate", type= KafkaStreamsStateStoreProperties.StoreType.WINDOW, lengthMs=300000)
+public void process(KStream<Object, Product> input) {
+    ...
+}
+----
+
+Accessing the state store:
+[source]
+----
+Processor<Object, Product>() {
+
+    WindowStore<Object, String> state;
+
+    @Override
+    public void init(ProcessorContext processorContext) {
+        state = (WindowStore)processorContext.getStateStore("mystate");
+    }
+    ...
+}
+----
+
+=== Interactive Queries
+
+As part of the public Kafka Streams binder API, we expose a class called `InteractiveQueryService`.
+You can access this as a Spring bean in your application. An easy way to get access to this bean from your application is to "autowire" the bean.
+
+[source]
+----
+@Autowired
+private InteractiveQueryService interactiveQueryService;
+----
+
+Once you gain access to this bean, then you can query for the particular state-store that you are interested. See below.
+
+[source]
+----
+ReadOnlyKeyValueStore<Object, Object> keyValueStore =
+						interactiveQueryService.getQueryableStoreType("my-store", QueryableStoreTypes.keyValueStore());
+----
+
+If there are multiple instances of the kafka streams application running, then before you can query them interactively, you need to identify which application instance hosts the key.
+`InteractiveQueryService` API provides methods for identifying the host information.
+
+In order for this to work, you must configure the property `application.server` as below:
+
+[source]
+----
+spring.cloud.stream.kafka.streams.binder.configuration.application.server: <server>:<port>
+----
+
+Here are some code snippets:
+
+[source]
+----
+org.apache.kafka.streams.state.HostInfo hostInfo = interactiveQueryService.getHostInfo("store-name",
+						key, keySerializer);
+
+if (interactiveQueryService.getCurrentHostInfo().equals(hostInfo)) {
+
+    //query from the store that is locally available
+}
+else {
+    //query from the remote host
+}
+----
+
+=== Accessing the underlying KafkaStreams object
+
+`StreamBuilderFactoryBean` from spring-kafka that is responsible for constructing the `KafkaStreams` object can be accessed programmatically.
+Each `StreamBuilderFactoryBean` is registered as `stream-builder` and appended with the `StreamListener` method name.
+If your `StreamListener` method is named as `process` for example, the stream builder bean is named as `stream-builder-process`.
+Since this is a factory bean, it should be accessed by prepending an ampersand (`&`) when accessing it programmatically.
+Following is an example and it assumes the `StreamListener` method is named as `process`
+
+[source]
+----
+StreamsBuilderFactoryBean streamsBuilderFactoryBean = context.getBean("&stream-builder-process", StreamsBuilderFactoryBean.class);
+			KafkaStreams kafkaStreams = streamsBuilderFactoryBean.getKafkaStreams();
+----
+
+=== State Cleanup
+
+By default, the `Kafkastreams.cleanup()` method is called when the binding is stopped.
+See https://docs.spring.io/spring-kafka/reference/html/_reference.html#_configuration[the Spring Kafka documentation].
+To modify this behavior simply add a single `CleanupConfig` `@Bean` (configured to clean up on start, stop, or neither) to the application context; the bean will be detected and wired into the factory bean.

docs/src/main/asciidoc/overview.adoc

@@ -0,0 +1,570 @@
+[partintro]
+--
+This guide describes the Apache Kafka implementation of the Spring Cloud Stream Binder.
+It contains information about its design, usage, and configuration options, as well as information on how the Stream Cloud Stream concepts map onto Apache Kafka specific constructs.
+In addition, this guide explains the Kafka Streams binding capabilities of Spring Cloud Stream.
+--
+
+== Apache Kafka Binder
+
+=== Usage
+
+To use Apache Kafka binder, you need to add `spring-cloud-stream-binder-kafka` as a dependency to your Spring Cloud Stream application, as shown in the following example for Maven:
+
+[source,xml]
+----
+<dependency>
+  <groupId>org.springframework.cloud</groupId>
+  <artifactId>spring-cloud-stream-binder-kafka</artifactId>
+</dependency>
+----
+
+Alternatively, you can also use the Spring Cloud Stream Kafka Starter, as shown inn the following example for Maven:
+
+[source,xml]
+----
+<dependency>
+  <groupId>org.springframework.cloud</groupId>
+  <artifactId>spring-cloud-starter-stream-kafka</artifactId>
+</dependency>
+----
+
+=== Overview
+
+The following image shows a simplified diagram of how the Apache Kafka binder operates:
+
+.Kafka Binder
+image::{github-raw}/docs/src/main/asciidoc/images/kafka-binder.png[width=300,scaledwidth="50%"]
+
+The Apache Kafka Binder implementation maps each destination to an Apache Kafka topic.
+The consumer group maps directly to the same Apache Kafka concept.
+Partitioning also maps directly to Apache Kafka partitions as well.
+
+The binder currently uses the Apache Kafka `kafka-clients` 1.0.0 jar and is designed to be used with a broker of at least that version.
+This client can communicate with older brokers (see the Kafka documentation), but certain features may not be available.
+For example, with versions earlier than 0.11.x.x, native headers are not supported.
+Also, 0.11.x.x does not support the `autoAddPartitions` property.
+
+=== Configuration Options
+
+This section contains the configuration options used by the Apache Kafka binder.
+
+For common configuration options and properties pertaining to binder, see the <<binding-properties,core documentation>>.
+
+==== Kafka Binder Properties
+
+spring.cloud.stream.kafka.binder.brokers::
+A list of brokers to which the Kafka binder connects.
++
+Default: `localhost`.
+spring.cloud.stream.kafka.binder.defaultBrokerPort::
+`brokers` allows hosts specified with or without port information (for example, `host1,host2:port2`).
+This sets the default port when no port is configured in the broker list.
++
+Default: `9092`.
+spring.cloud.stream.kafka.binder.configuration::
+Key/Value map of client properties (both producers and consumer) passed to all clients created by the binder.
+Due to the fact that these properties are used by both producers and consumers, usage should be restricted to common properties -- for example, security settings.
+Unknown Kafka producer or consumer properties provided through this configuration are filtered out and not allowed to propagate.
+Properties here supersede any properties set in boot.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.consumerProperties::
+Key/Value map of arbitrary Kafka client consumer properties.
+In addition to support known Kafka consumer properties, unknown consumer properties are allowed here as well.
+Properties here supersede any properties set in boot and in the `configuration` property above.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.headers::
+The list of custom headers that are transported by the binder.
+Only required when communicating with older applications (<= 1.3.x) with a `kafka-clients` version < 0.11.0.0. Newer versions support headers natively.
++
+Default: empty.
+spring.cloud.stream.kafka.binder.healthTimeout::
+The time to wait to get partition information, in seconds.
+Health reports as down if this timer expires.
++
+Default: 10.
+spring.cloud.stream.kafka.binder.requiredAcks::
+The number of required acks on the broker.
+See the Kafka documentation for the producer `acks` property.
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.minPartitionCount::
+Effective only if `autoCreateTopics` or `autoAddPartitions` is set.
+The global minimum number of partitions that the binder configures on topics on which it produces or consumes data.
+It can be superseded by the `partitionCount` setting of the producer or by the value of `instanceCount * concurrency` settings of the producer (if either is larger).
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.producerProperties::
+Key/Value map of arbitrary Kafka client producer properties.
+In addition to support known Kafka producer properties, unknown producer properties are allowed here as well.
+Properties here supersede any properties set in boot and in the `configuration` property above.
++
+Default: Empty map.
+spring.cloud.stream.kafka.binder.replicationFactor::
+The replication factor of auto-created topics if `autoCreateTopics` is active.
+Can be overridden on each binding.
++
+Default: `1`.
+spring.cloud.stream.kafka.binder.autoCreateTopics::
+If set to `true`, the binder creates new topics automatically.
+If set to `false`, the binder relies on the topics being already configured.
+In the latter case, if the topics do not exist, the binder fails to start.
++
+NOTE: This setting is independent of the `auto.topic.create.enable` setting of the broker and does not influence it.
+If the server is set to auto-create topics, they may be created as part of the metadata retrieval request, with default broker settings.
++
+Default: `true`.
+spring.cloud.stream.kafka.binder.autoAddPartitions::
+If set to `true`, the binder creates new partitions if required.
+If set to `false`, the binder relies on the partition size of the topic being already configured.
+If the partition count of the target topic is smaller than the expected value, the binder fails to start.
++
+Default: `false`.
+spring.cloud.stream.kafka.binder.transaction.transactionIdPrefix::
+Enables transactions in the binder. See `transaction.id` in the Kafka documentation and https://docs.spring.io/spring-kafka/reference/html/_reference.html#transactions[Transactions] in the `spring-kafka` documentation.
+When transactions are enabled, individual `producer` properties are ignored and all producers use the `spring.cloud.stream.kafka.binder.transaction.producer.*` properties.
++
+Default `null` (no transactions)
+spring.cloud.stream.kafka.binder.transaction.producer.*::
+Global producer properties for producers in a transactional binder.
+See `spring.cloud.stream.kafka.binder.transaction.transactionIdPrefix` and <<kafka-producer-properties>> and the general producer properties supported by all binders.
++
+Default: See individual producer properties.
+
+spring.cloud.stream.kafka.binder.headerMapperBeanName::
+The bean name of a `KafkaHeaderMapper` used for mapping `spring-messaging` headers to and from Kafka headers.
+Use this, for example, if you wish to customize the trusted packages in a `DefaultKafkaHeaderMapper` that uses JSON deserialization for the headers.
++
+Default: none.
+
+[[kafka-consumer-properties]]
+==== Kafka Consumer Properties
+
+The following properties are available for Kafka consumers only and
+must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.consumer.`.
+
+admin.configuration::
+A `Map` of Kafka topic properties used when provisioning topics -- for example, `spring.cloud.stream.kafka.bindings.input.consumer.admin.configuration.message.format.version=0.9.0.0`
++
+Default: none.
+
+admin.replicas-assignment::
+A Map<Integer, List<Integer>> of replica assignments, with the key being the partition and the value being the assignments.
+Used when provisioning new topics.
+See the `NewTopic` Javadocs in the `kafka-clients` jar.
++
+Default: none.
+
+admin.replication-factor::
+The replication factor to use when provisioning topics. Overrides the binder-wide setting.
+Ignored if `replicas-assignments` is present.
++
+Default: none (the binder-wide default of 1 is used).
+
+autoRebalanceEnabled::
+When `true`, topic partitions is automatically rebalanced between the members of a consumer group.
+When `false`, each consumer is assigned a fixed set of partitions based on `spring.cloud.stream.instanceCount` and `spring.cloud.stream.instanceIndex`.
+This requires both the `spring.cloud.stream.instanceCount` and `spring.cloud.stream.instanceIndex` properties to be set appropriately on each launched instance.
+The value of the `spring.cloud.stream.instanceCount` property must typically be greater than 1 in this case.
++
+Default: `true`.
+ackEachRecord::
+When `autoCommitOffset` is `true`, this setting dictates whether to commit the offset after each record is processed.
+By default, offsets are committed after all records in the batch of records returned by `consumer.poll()` have been processed.
+The number of records returned by a poll can be controlled with the `max.poll.records` Kafka property, which is set through the consumer `configuration` property.
+Setting this to `true` may cause a degradation in performance, but doing so reduces the likelihood of redelivered records when a failure occurs.
+Also, see the binder `requiredAcks` property, which also affects the performance of committing offsets.
++
+Default: `false`.
+autoCommitOffset::
+Whether to autocommit offsets when a message has been processed.
+If set to `false`, a header with the key `kafka_acknowledgment` of the type `org.springframework.kafka.support.Acknowledgment` header is present in the inbound message.
+Applications may use this header for acknowledging messages.
+See the examples section for details.
+When this property is set to `false`, Kafka binder sets the ack mode to `org.springframework.kafka.listener.AbstractMessageListenerContainer.AckMode.MANUAL` and the application is responsible for acknowledging records.
+Also see `ackEachRecord`.
++
+Default: `true`.
+autoCommitOnError::
+Effective only if `autoCommitOffset` is set to `true`.
+If set to `false`, it suppresses auto-commits for messages that result in errors and commits only for successful messages. It allows a stream to automatically replay from the last successfully processed message, in case of persistent failures.
+If set to `true`, it always auto-commits (if auto-commit is enabled).
+If not set (the default), it effectively has the same value as `enableDlq`, auto-committing erroneous messages if they are sent to a DLQ and not committing them otherwise.
++
+Default: not set.
+resetOffsets::
+Whether to reset offsets on the consumer to the value provided by startOffset.
+Must be false if a `KafkaRebalanceListener` is provided; see <<rebalance-listener>>.
++
+Default: `false`.
+startOffset::
+The starting offset for new groups.
+Allowed values: `earliest` and `latest`.
+If the consumer group is set explicitly for the consumer 'binding' (through `spring.cloud.stream.bindings.<channelName>.group`), 'startOffset' is set to `earliest`. Otherwise, it is set to `latest` for the `anonymous` consumer group.
+Also see `resetOffsets` (earlier in this list).
++
+Default: null (equivalent to `earliest`).
+enableDlq::
+When set to true, it enables DLQ behavior for the consumer.
+By default, messages that result in errors are forwarded to a topic named `error.<destination>.<group>`.
+The DLQ topic name can be configurable by setting the `dlqName` property.
+This provides an alternative option to the more common Kafka replay scenario for the case when the number of errors is relatively small and replaying the entire original topic may be too cumbersome.
+See <<kafka-dlq-processing>> processing for more information.
+Starting with version 2.0, messages sent to the DLQ topic are enhanced with the following headers: `x-original-topic`, `x-exception-message`, and `x-exception-stacktrace` as `byte[]`.
+**Not allowed when `destinationIsPattern` is `true`.**
++
+Default: `false`.
+configuration::
+Map with a key/value pair containing generic Kafka consumer properties.
+In addition to having Kafka consumer properties, other configuration properties can be passed here.
+For example some properties needed by the application such as `spring.cloud.stream.kafka.bindings.input.consumer.configuration.foo=bar`.
++
+Default: Empty map.
+dlqName::
+The name of the DLQ topic to receive the error messages.
++
+Default: null (If not specified, messages that result in errors are forwarded to a topic named `error.<destination>.<group>`).
+dlqProducerProperties::
+Using this, DLQ-specific producer properties can be set.
+All the properties available through kafka producer properties can be set through this property.
++
+Default: Default Kafka producer properties.
+standardHeaders::
+Indicates which standard headers are populated by the inbound channel adapter.
+Allowed values: `none`, `id`, `timestamp`, or `both`.
+Useful if using native deserialization and the first component to receive a message needs an `id` (such as an aggregator that is configured to use a JDBC message store).
++
+Default: `none`
+converterBeanName::
+The name of a bean that implements `RecordMessageConverter`. Used in the inbound channel adapter to replace the default `MessagingMessageConverter`.
++
+Default: `null`
+idleEventInterval::
+The interval, in milliseconds, between events indicating that no messages have recently been received.
+Use an `ApplicationListener<ListenerContainerIdleEvent>` to receive these events.
+See <<pause-resume>> for a usage example.
++
+Default: `30000`
+destinationIsPattern::
+When true, the destination is treated as a regular expression `Pattern` used to match topic names by the broker.
+When true, topics are not provisioned, and `enableDlq` is not allowed, because the binder does not know the topic names during the provisioning phase.
+Note, the time taken to detect new topics that match the pattern is controlled by the consumer property `metadata.max.age.ms`, which (at the time of writing) defaults to 300,000ms (5 minutes).
+This can be configured using the `configuration` property above.
++
+Default: `false`
+
+[[kafka-producer-properties]]
+==== Kafka Producer Properties
+
+The following properties are available for Kafka producers only and
+must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.producer.`.
+
+admin.configuration::
+A `Map` of Kafka topic properties used when provisioning new topics -- for example, `spring.cloud.stream.kafka.bindings.input.consumer.admin.configuration.message.format.version=0.9.0.0`
++
+Default: none.
+
+admin.replicas-assignment::
+A Map<Integer, List<Integer>> of replica assignments, with the key being the partition and the value being the assignments.
+Used when provisioning new topics.
+See `NewTopic` javadocs in the `kafka-clients` jar.
++
+Default: none.
+
+admin.replication-factor::
+The replication factor to use when provisioning new topics. Overrides the binder-wide setting.
+Ignored if `replicas-assignments` is present.
++
+Default: none (the binder-wide default of 1 is used).
+
+bufferSize::
+Upper limit, in bytes, of how much data the Kafka producer attempts to batch before sending.
++
+Default: `16384`.
+sync::
+Whether the producer is synchronous.
++
+Default: `false`.
+batchTimeout::
+How long the producer waits to allow more messages to accumulate in the same batch before sending the messages.
+(Normally, the producer does not wait at all and simply sends all the messages that accumulated while the previous send was in progress.) A non-zero value may increase throughput at the expense of latency.
++
+Default: `0`.
+messageKeyExpression::
+A SpEL expression evaluated against the outgoing message used to populate the key of the produced Kafka message -- for example, `headers['myKey']`.
+The payload cannot be used because, by the time this expression is evaluated, the payload is already in the form of a `byte[]`.
++
+Default: `none`.
+headerPatterns::
+A comma-delimited list of simple patterns to match Spring messaging headers to be mapped to the Kafka `Headers` in the `ProducerRecord`.
+Patterns can begin or end with the wildcard character (asterisk).
+Patterns can be negated by prefixing with `!`.
+Matching stops after the first match (positive or negative).
+For example `!ask,as*` will pass `ash` but not `ask`.
+`id` and `timestamp` are never mapped.
++
+Default: `*` (all headers - except the `id` and `timestamp`)
+configuration::
+Map with a key/value pair containing generic Kafka producer properties.
++
+Default: Empty map.
+
+NOTE: The Kafka binder uses the `partitionCount` setting of the producer as a hint to create a topic with the given partition count (in conjunction with the `minPartitionCount`, the maximum of the two being the value being used).
+Exercise caution when configuring both `minPartitionCount` for a binder and `partitionCount` for an application, as the larger value is used.
+If a topic already exists with a smaller partition count and `autoAddPartitions` is disabled (the default), the binder fails to start.
+If a topic already exists with a smaller partition count and `autoAddPartitions` is enabled, new partitions are added.
+If a topic already exists with a larger number of partitions than the maximum of (`minPartitionCount` or `partitionCount`), the existing partition count is used.
+
+==== Usage examples
+
+In this section, we show the use of the preceding properties for specific scenarios.
+
+===== Example: Setting `autoCommitOffset` to `false` and Relying on Manual Acking
+
+This example illustrates how one may manually acknowledge offsets in a consumer application.
+
+This example requires that `spring.cloud.stream.kafka.bindings.input.consumer.autoCommitOffset` be set to `false`.
+Use the corresponding input channel name for your example.
+
+[source]
+----
+@SpringBootApplication
+@EnableBinding(Sink.class)
+public class ManuallyAcknowdledgingConsumer {
+
+ public static void main(String[] args) {
+     SpringApplication.run(ManuallyAcknowdledgingConsumer.class, args);
+ }
+
+ @StreamListener(Sink.INPUT)
+ public void process(Message<?> message) {
+     Acknowledgment acknowledgment = message.getHeaders().get(KafkaHeaders.ACKNOWLEDGMENT, Acknowledgment.class);
+     if (acknowledgment != null) {
+         System.out.println("Acknowledgment provided");
+         acknowledgment.acknowledge();
+     }
+ }
+}
+----
+
+===== Example: Security Configuration
+
+Apache Kafka 0.9 supports secure connections between client and brokers.
+To take advantage of this feature, follow the guidelines in the http://kafka.apache.org/090/documentation.html#security_configclients[Apache Kafka Documentation] as well as the Kafka 0.9 http://docs.confluent.io/2.0.0/kafka/security.html[security guidelines from the Confluent documentation].
+Use the `spring.cloud.stream.kafka.binder.configuration` option to set security properties for all clients created by the binder.
+
+For example, to set `security.protocol` to `SASL_SSL`, set the following property:
+
+[source]
+----
+spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_SSL
+----
+
+All the other security properties can be set in a similar manner.
+
+When using Kerberos, follow the instructions in the http://kafka.apache.org/090/documentation.html#security_sasl_clientconfig[reference documentation] for creating and referencing the JAAS configuration.
+
+Spring Cloud Stream supports passing JAAS configuration information to the application by using a JAAS configuration file and using Spring Boot properties.
+
+====== Using JAAS Configuration Files
+
+The JAAS and (optionally) krb5 file locations can be set for Spring Cloud Stream applications by using system properties.
+The following example shows how to launch a Spring Cloud Stream application with SASL and Kerberos by using a JAAS configuration file:
+
+[source,bash]
+----
+ java -Djava.security.auth.login.config=/path.to/kafka_client_jaas.conf -jar log.jar \
+   --spring.cloud.stream.kafka.binder.brokers=secure.server:9092 \
+   --spring.cloud.stream.bindings.input.destination=stream.ticktock \
+   --spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_PLAINTEXT
+----
+
+====== Using Spring Boot Properties
+
+As an alternative to having a JAAS configuration file, Spring Cloud Stream provides a mechanism for setting up the JAAS configuration for Spring Cloud Stream applications by using Spring Boot properties.
+
+The following properties can be used to configure the login context of the Kafka client:
+
+spring.cloud.stream.kafka.binder.jaas.loginModule::
+The login module name. Not necessary to be set in normal cases.
++
+Default: `com.sun.security.auth.module.Krb5LoginModule`.
+spring.cloud.stream.kafka.binder.jaas.controlFlag::
+The control flag of the login module.
++
+Default: `required`.
+spring.cloud.stream.kafka.binder.jaas.options::
+Map with a key/value pair containing the login module options.
++
+Default: Empty map.
+
+The following example shows how to launch a Spring Cloud Stream application with SASL and Kerberos by using Spring Boot configuration properties:
+
+[source,bash]
+----
+ java --spring.cloud.stream.kafka.binder.brokers=secure.server:9092 \
+   --spring.cloud.stream.bindings.input.destination=stream.ticktock \
+   --spring.cloud.stream.kafka.binder.autoCreateTopics=false \
+   --spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_PLAINTEXT \
+   --spring.cloud.stream.kafka.binder.jaas.options.useKeyTab=true \
+   --spring.cloud.stream.kafka.binder.jaas.options.storeKey=true \
+   --spring.cloud.stream.kafka.binder.jaas.options.keyTab=/etc/security/keytabs/kafka_client.keytab \
+   --spring.cloud.stream.kafka.binder.jaas.options.principal=kafka-client-1@EXAMPLE.COM
+----
+
+The preceding example represents the equivalent of the following JAAS file:
+
+[source]
+----
+KafkaClient {
+    com.sun.security.auth.module.Krb5LoginModule required
+    useKeyTab=true
+    storeKey=true
+    keyTab="/etc/security/keytabs/kafka_client.keytab"
+    principal="kafka-client-1@EXAMPLE.COM";
+};
+----
+
+If the topics required already exist on the broker or will be created by an administrator, autocreation can be turned off and only client JAAS properties need to be sent.
+
+NOTE: Do not mix JAAS configuration files and Spring Boot properties in the same application.
+If the `-Djava.security.auth.login.config` system property is already present, Spring Cloud Stream ignores the Spring Boot properties.
+
+NOTE: Be careful when using the `autoCreateTopics` and `autoAddPartitions` with Kerberos.
+Usually, applications may use principals that do not have administrative rights in Kafka and Zookeeper.
+Consequently, relying on Spring Cloud Stream to create/modify topics may fail.
+In secure environments, we strongly recommend creating topics and managing ACLs administratively by using Kafka tooling.
+
+[[pause-resume]]
+===== Example: Pausing and Resuming the Consumer
+
+If you wish to suspend consumption but not cause a partition rebalance, you can pause and resume the consumer.
+This is facilitated by adding the `Consumer` as a parameter to your `@StreamListener`.
+To resume, you need an `ApplicationListener` for `ListenerContainerIdleEvent` instances.
+The frequency at which events are published is controlled by the `idleEventInterval` property.
+Since the consumer is not thread-safe, you must call these methods on the calling thread.
+
+The following simple application shows how to pause and resume:
+
+[source, java]
+----
+@SpringBootApplication
+@EnableBinding(Sink.class)
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+	@StreamListener(Sink.INPUT)
+	public void in(String in, @Header(KafkaHeaders.CONSUMER) Consumer<?, ?> consumer) {
+		System.out.println(in);
+		consumer.pause(Collections.singleton(new TopicPartition("myTopic", 0)));
+	}
+
+	@Bean
+	public ApplicationListener<ListenerContainerIdleEvent> idleListener() {
+		return event -> {
+			System.out.println(event);
+			if (event.getConsumer().paused().size() > 0) {
+				event.getConsumer().resume(event.getConsumer().paused());
+			}
+		};
+	}
+
+}
+----
+
+[[kafka-error-channels]]
+=== Error Channels
+
+Starting with version 1.3, the binder unconditionally sends exceptions to an error channel for each consumer destination and can also be configured to send async producer send failures to an error channel.
+See <<spring-cloud-stream-overview-error-handling>> for more information.
+
+The payload of the `ErrorMessage` for a send failure is a `KafkaSendFailureException` with properties:
+
+* `failedMessage`: The Spring Messaging `Message<?>` that failed to be sent.
+* `record`: The raw `ProducerRecord` that was created from the `failedMessage`
+
+There is no automatic handling of producer exceptions (such as sending to a <<kafka-dlq-processing, Dead-Letter queue>>).
+You can consume these exceptions with your own Spring Integration flow.
+
+[[kafka-metrics]]
+=== Kafka Metrics
+
+Kafka binder module exposes the following metrics:
+
+`spring.cloud.stream.binder.kafka.offset`: This metric indicates how many messages have not been yet consumed from a given binder's topic by a given consumer group.
+The metrics provided are based on the Mircometer metrics library. The metric contains the consumer group information, topic and the actual lag in committed offset from the latest offset on the topic.
+This metric is particularly useful for providing auto-scaling feedback to a PaaS platform.
+
+[[kafka-tombstones]]
+=== Tombstone Records (null record values)
+
+When using compacted topics, a record with a `null` value (also called a tombstone record) represents the deletion of a key.
+To receive such messages in a `@StreamListener` method, the parameter must be marked as not required to receive a `null` value argument.
+
+====
+[source, java]
+----
+@StreamListener(Sink.INPUT)
+public void in(@Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) byte[] key,
+               @Payload(required = false) Customer customer) {
+    // customer is null if a tombstone record
+    ...
+}
+----
+====
+
+[[rebalance-listener]]
+=== Using a KafkaRebalanceListener
+
+Applications may wish to seek topics/partitions to arbitrary offsets when the partitions are initially assigned, or perform other operations on the consumer.
+Starting with version 2.1, if you provide a single `KafkaRebalanceListener` bean in the application context, it will be wired into all Kafka consumer bindings.
+
+====
+[source, java]
+----
+public interface KafkaBindingRebalanceListener {
+
+	/**
+	 * Invoked by the container before any pending offsets are committed.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 */
+	default void onPartitionsRevokedBeforeCommit(String bindingName, Consumer<?, ?> consumer,
+			Collection<TopicPartition> partitions) {
+
+	}
+
+	/**
+	 * Invoked by the container after any pending offsets are committed.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 */
+	default void onPartitionsRevokedAfterCommit(String bindingName, Consumer<?, ?> consumer, Collection<TopicPartition> partitions) {
+
+	}
+
+	/**
+	 * Invoked when partitions are initially assigned or after a rebalance.
+	 * Applications might only want to perform seek operations on an initial assignment.
+	 * @param bindingName the name of the binding.
+	 * @param consumer the consumer.
+	 * @param partitions the partitions.
+	 * @param initial true if this is the initial assignment.
+	 */
+	default void onPartitionsAssigned(String bindingName, Consumer<?, ?> consumer, Collection<TopicPartition> partitions,
+			boolean initial) {
+
+	}
+
+}
+----
+====
+
+You cannot set the `resetOffsets` consumer property to `true` when you provide a rebalance listener.

docs/src/main/asciidoc/partitions.adoc

@@ -0,0 +1,104 @@
+=== Partitioning with the Kafka Binder
+
+Apache Kafka supports topic partitioning natively.
+
+Sometimes it is advantageous to send data to specific partitions -- for example, when you want to strictly order message processing (all messages for a particular customer should go to the same partition).
+
+The following example shows how to configure the producer and consumer side:
+
+[source, java]
+----
+@SpringBootApplication
+@EnableBinding(Source.class)
+public class KafkaPartitionProducerApplication {
+
+    private static final Random RANDOM = new Random(System.currentTimeMillis());
+
+    private static final String[] data = new String[] {
+            "foo1", "bar1", "qux1",
+            "foo2", "bar2", "qux2",
+            "foo3", "bar3", "qux3",
+            "foo4", "bar4", "qux4",
+            };
+
+    public static void main(String[] args) {
+        new SpringApplicationBuilder(KafkaPartitionProducerApplication.class)
+            .web(false)
+            .run(args);
+    }
+
+    @InboundChannelAdapter(channel = Source.OUTPUT, poller = @Poller(fixedRate = "5000"))
+    public Message<?> generate() {
+        String value = data[RANDOM.nextInt(data.length)];
+        System.out.println("Sending: " + value);
+        return MessageBuilder.withPayload(value)
+                .setHeader("partitionKey", value)
+                .build();
+    }
+
+}
+----
+
+.application.yml
+[source, yaml]
+----
+spring:
+  cloud:
+    stream:
+      bindings:
+        output:
+          destination: partitioned.topic
+          producer:
+            partitioned: true
+            partition-key-expression: headers['partitionKey']
+            partition-count: 12
+----
+
+IMPORTANT: The topic must be provisioned to have enough partitions to achieve the desired concurrency for all consumer groups.
+The above configuration supports up to 12 consumer instances (6 if their `concurrency` is 2, 4 if their concurrency is 3, and so on).
+It is generally best to "`over-provision`" the partitions to allow for future increases in consumers or concurrency.
+
+NOTE: The preceding configuration uses the default partitioning (`key.hashCode() % partitionCount`).
+This may or may not provide a suitably balanced algorithm, depending on the key values.
+You can override this default by using the `partitionSelectorExpression` or `partitionSelectorClass` properties.
+
+Since partitions are natively handled by Kafka, no special configuration is needed on the consumer side.
+Kafka allocates partitions across the instances.
+
+The following Spring Boot application listens to a Kafka stream and prints (to the console) the partition ID to which each message goes:
+
+[source, java]
+----
+@SpringBootApplication
+@EnableBinding(Sink.class)
+public class KafkaPartitionConsumerApplication {
+
+    public static void main(String[] args) {
+        new SpringApplicationBuilder(KafkaPartitionConsumerApplication.class)
+            .web(false)
+            .run(args);
+    }
+
+    @StreamListener(Sink.INPUT)
+    public void listen(@Payload String in, @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition) {
+        System.out.println(in + " received from partition " + partition);
+    }
+
+}
+----
+
+.application.yml
+[source, yaml]
+----
+spring:
+  cloud:
+    stream:
+      bindings:
+        input:
+          destination: partitioned.topic
+          group: myGroup
+----
+
+You can add instances as needed.
+Kafka rebalances the partition allocations.
+If the instance count (or `instance count * concurrency`) exceeds the number of partitions, some consumers are idle.

docs/src/main/asciidoc/spring-cloud-stream-binder-kafka-aggregate.adoc

@@ -0,0 +1,3 @@
+include::overview.adoc[leveloffset=+1]
+include::dlq.adoc[leveloffset=+1]
+include::partitions.adoc[leveloffset=+1]

docs/src/main/asciidoc/spring-cloud-stream-binder-kafka.adoc

@@ -1,6 +1,16 @@
+:github-tag: master
+:github-repo: spring-cloud/spring-cloud-stream-binder-kafka
+:github-raw: https://raw.githubusercontent.com/{github-repo}/{github-tag}
+:github-code: https://github.com/{github-repo}/tree/{github-tag}
+:toc: left
+:toclevels: 8
+:nofooter:
+:sectlinks: true
+
+
 [[spring-cloud-stream-binder-kafka-reference]]
 = Spring Cloud Stream Kafka Binder Reference Guide
-Sabby Anandan, Marius Bogoevici, Eric Bottard, Mark Fisher, Ilayaperumal Gopinathan, Gunnar Hillert, Mark Pollack, Patrick Peralta, Glenn Renfro, Thomas Risberg, Dave Syer, David Turanski, Janne Valkealahti, Benjamin Klein
+Sabby Anandan, Marius Bogoevici, Eric Bottard, Mark Fisher, Ilayaperumal Gopinathan, Gunnar Hillert, Mark Pollack, Patrick Peralta, Glenn Renfro, Thomas Risberg, Dave Syer, David Turanski, Janne Valkealahti, Benjamin Klein, Henryk Konsek, Gary Russell
 :doctype: book
 :toc:
 :toclevels: 4
@@ -24,10 +34,16 @@ Sabby Anandan, Marius Bogoevici, Eric Bottard, Mark Fisher, Ilayaperumal Gopinat
 = Reference Guide
 include::overview.adoc[]
 
+include::dlq.adoc[]
+
+include::partitions.adoc[]
+
+include::kafka-streams.adoc[]
 
 = Appendices
 [appendix]
 include::building.adoc[]
+
 include::contributing.adoc[]
 
 // ======================================================================================

docs/src/main/ruby/generate_readme.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env ruby
+
+base_dir = File.join(File.dirname(__FILE__),'../../..')
+src_dir = File.join(base_dir, "/src/main/asciidoc")
+require 'asciidoctor'
+require 'optparse'
+
+options = {}
+file = "#{src_dir}/README.adoc"
+
+OptionParser.new do |o|
+  o.on('-o OUTPUT_FILE', 'Output file (default is stdout)') { |file| options[:to_file] = file unless file=='-' }
+  o.on('-h', '--help') { puts o; exit }
+  o.parse!
+end
+
+file = ARGV[0] if ARGV.length>0
+
+# Copied from https://github.com/asciidoctor/asciidoctor-extensions-lab/blob/master/scripts/asciidoc-coalescer.rb
+doc = Asciidoctor.load_file file, safe: :unsafe, header_only: true, attributes: options[:attributes]
+header_attr_names = (doc.instance_variable_get :@attributes_modified).to_a
+header_attr_names.each {|k| doc.attributes[%(#{k}!)] = '' unless doc.attr? k }
+attrs = doc.attributes
+attrs['allow-uri-read'] = true
+puts attrs
+
+out = "// Do not edit this file (e.g. go instead to src/main/asciidoc)\n\n"
+doc = Asciidoctor.load_file file, safe: :unsafe, parse: false, attributes: attrs
+out << doc.reader.read
+
+unless options[:to_file]
+  puts out
+else
+  File.open(options[:to_file],'w+') do |file|
+    file.write(out)
+  end
+end

mvnw

@@ -57,27 +57,27 @@ case "`uname`" in
            #
            # Look for the Apple JDKs first to preserve the existing behaviour, and then look
            # for the new JDKs provided by Oracle.
-           # 
+           #
            if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK ] ; then
              #
              # Apple JDKs
              #
              export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
            fi
-           
+
            if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Java/JavaVirtualMachines/CurrentJDK ] ; then
              #
              # Apple JDKs
              #
              export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
            fi
-             
+
            if [ -z "$JAVA_HOME" ] && [ -L "/Library/Java/JavaVirtualMachines/CurrentJDK" ] ; then
              #
              # Oracle JDKs
              #
              export JAVA_HOME=/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
-           fi           
+           fi
 
            if [ -z "$JAVA_HOME" ] && [ -x "/usr/libexec/java_home" ]; then
              #
@@ -219,16 +219,27 @@ concat_lines() {
 export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-$(find_maven_basedir)}
 MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
 
-# Provide a "standardized" way to retrieve the CLI args that will 
+# Provide a "standardized" way to retrieve the CLI args that will
 # work with both Windows and non-Windows executions.
 MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
 export MAVEN_CMD_LINE_ARGS
 
 WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
 
+echo "Running version check"
+VERSION=$( sed '\!<parent!,\!</parent!d' `dirname $0`/pom.xml | grep '<version' | head -1 | sed -e 's/.*<version>//' -e 's!</version>.*$!!' )
+echo "The found version is [${VERSION}]"
+
+if echo $VERSION | egrep -q 'M|RC'; then
+    echo Activating \"milestone\" profile for version=\"$VERSION\"
+    echo $MAVEN_ARGS | grep -q milestone || MAVEN_ARGS="$MAVEN_ARGS -Pmilestone"
+else
+    echo Deactivating \"milestone\" profile for version=\"$VERSION\"
+    echo $MAVEN_ARGS | grep -q milestone && MAVEN_ARGS=$(echo $MAVEN_ARGS | sed -e 's/-Pmilestone//')
+fi
+
 exec "$JAVACMD" \
   $MAVEN_OPTS \
   -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
   "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
-  ${WRAPPER_LAUNCHER} "$@"
-
+  ${WRAPPER_LAUNCHER} ${MAVEN_ARGS} "$@"

mvnw.cmd

@@ -1,234 +1,145 @@
-#!/bin/sh
-# ----------------------------------------------------------------------------
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-# ----------------------------------------------------------------------------
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
 
-# ----------------------------------------------------------------------------
-# Maven2 Start Up Batch script
-#
-# Required ENV vars:
-# ------------------
-#   JAVA_HOME - location of a JDK home dir
-#
-# Optional ENV vars
-# -----------------
-#   M2_HOME - location of maven2's installed home dir
-#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
-#     e.g. to debug Maven itself, use
-#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
-#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
-# ----------------------------------------------------------------------------
+@REM ----------------------------------------------------------------------------
+@REM Maven2 Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
 
-if [ -z "$MAVEN_SKIP_RC" ] ; then
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM enable echoing my setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
 
-  if [ -f /etc/mavenrc ] ; then
-    . /etc/mavenrc
-  fi
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
 
-  if [ -f "$HOME/.mavenrc" ] ; then
-    . "$HOME/.mavenrc"
-  fi
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
 
-fi
+@setlocal
 
-# OS specific support.  $var _must_ be set to either true or false.
-cygwin=false;
-darwin=false;
-mingw=false
-case "`uname`" in
-  CYGWIN*) cygwin=true ;;
-  MINGW*) mingw=true;;
-  Darwin*) darwin=true
-           #
-           # Look for the Apple JDKs first to preserve the existing behaviour, and then look
-           # for the new JDKs provided by Oracle.
-           # 
-           if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK ] ; then
-             #
-             # Apple JDKs
-             #
-             export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
-           fi
-           
-           if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Java/JavaVirtualMachines/CurrentJDK ] ; then
-             #
-             # Apple JDKs
-             #
-             export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
-           fi
-             
-           if [ -z "$JAVA_HOME" ] && [ -L "/Library/Java/JavaVirtualMachines/CurrentJDK" ] ; then
-             #
-             # Oracle JDKs
-             #
-             export JAVA_HOME=/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
-           fi           
+set ERROR_CODE=0
 
-           if [ -z "$JAVA_HOME" ] && [ -x "/usr/libexec/java_home" ]; then
-             #
-             # Apple JDKs
-             #
-             export JAVA_HOME=`/usr/libexec/java_home`
-           fi
-           ;;
-esac
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
 
-if [ -z "$JAVA_HOME" ] ; then
-  if [ -r /etc/gentoo-release ] ; then
-    JAVA_HOME=`java-config --jre-home`
-  fi
-fi
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
 
-if [ -z "$M2_HOME" ] ; then
-  ## resolve links - $0 may be a link to maven's home
-  PRG="$0"
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
 
-  # need this for relative symlinks
-  while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-      PRG="$link"
-    else
-      PRG="`dirname "$PRG"`/$link"
-    fi
-  done
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
 
-  saveddir=`pwd`
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
 
-  M2_HOME=`dirname "$PRG"`/..
+@REM ==== END VALIDATION ====
 
-  # make it fully qualified
-  M2_HOME=`cd "$M2_HOME" && pwd`
+:init
 
-  cd "$saveddir"
-  # echo Using m2 at $M2_HOME
-fi
+set MAVEN_CMD_LINE_ARGS=%*
 
-# For Cygwin, ensure paths are in UNIX format before anything is touched
-if $cygwin ; then
-  [ -n "$M2_HOME" ] &&
-    M2_HOME=`cygpath --unix "$M2_HOME"`
-  [ -n "$JAVA_HOME" ] &&
-    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
-  [ -n "$CLASSPATH" ] &&
-    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
-fi
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
 
-# For Migwn, ensure paths are in UNIX format before anything is touched
-if $mingw ; then
-  [ -n "$M2_HOME" ] &&
-    M2_HOME="`(cd "$M2_HOME"; pwd)`"
-  [ -n "$JAVA_HOME" ] &&
-    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
-  # TODO classpath?
-fi
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
 
-if [ -z "$JAVA_HOME" ]; then
-  javaExecutable="`which javac`"
-  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
-    # readlink(1) is not available as standard on Solaris 10.
-    readLink=`which readlink`
-    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
-      if $darwin ; then
-        javaHome="`dirname \"$javaExecutable\"`"
-        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
-      else
-        javaExecutable="`readlink -f \"$javaExecutable\"`"
-      fi
-      javaHome="`dirname \"$javaExecutable\"`"
-      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
-      JAVA_HOME="$javaHome"
-      export JAVA_HOME
-    fi
-  fi
-fi
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
 
-if [ -z "$JAVACMD" ] ; then
-  if [ -n "$JAVA_HOME"  ] ; then
-    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
-      # IBM's JDK on AIX uses strange locations for the executables
-      JAVACMD="$JAVA_HOME/jre/sh/java"
-    else
-      JAVACMD="$JAVA_HOME/bin/java"
-    fi
-  else
-    JAVACMD="`which java`"
-  fi
-fi
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
 
-if [ ! -x "$JAVACMD" ] ; then
-  echo "Error: JAVA_HOME is not defined correctly." >&2
-  echo "  We cannot execute $JAVACMD" >&2
-  exit 1
-fi
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
 
-if [ -z "$JAVA_HOME" ] ; then
-  echo "Warning: JAVA_HOME environment variable is not set."
-fi
+:endDetectBaseDir
 
-CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
 
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin; then
-  [ -n "$M2_HOME" ] &&
-    M2_HOME=`cygpath --path --windows "$M2_HOME"`
-  [ -n "$JAVA_HOME" ] &&
-    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
-  [ -n "$CLASSPATH" ] &&
-    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
-fi
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
 
-# traverses directory structure from process work directory to filesystem root
-# first directory with .mvn subdirectory is considered project base directory
-find_maven_basedir() {
-  local basedir=$(pwd)
-  local wdir=$(pwd)
-  while [ "$wdir" != '/' ] ; do
-    if [ -d "$wdir"/.mvn ] ; then
-      basedir=$wdir
-      break
-    fi
-    wdir=$(cd "$wdir/.."; pwd)
-  done
-  echo "${basedir}"
-}
+:endReadAdditionalConfig
 
-# concatenates all lines of a file
-concat_lines() {
-  if [ -f "$1" ]; then
-    echo "$(tr -s '\n' ' ' < "$1")"
-  fi
-}
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
 
-export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-$(find_maven_basedir)}
-MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+set WRAPPER_JAR="".\.mvn\wrapper\maven-wrapper.jar""
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
 
-# Provide a "standardized" way to retrieve the CLI args that will 
-# work with both Windows and non-Windows executions.
-MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
-export MAVEN_CMD_LINE_ARGS
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CMD_LINE_ARGS%
+if ERRORLEVEL 1 goto error
+goto end
 
-WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+:error
+set ERROR_CODE=1
 
-exec "$JAVACMD" \
-  $MAVEN_OPTS \
-  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
-  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
-  ${WRAPPER_LAUNCHER} "$@"
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
 
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%

pom.xml

@@ -2,53 +2,129 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
-	<version>1.1.0.M1</version>
+	<version>2.1.0.RC3</version>
 	<packaging>pom</packaging>
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
-		<artifactId>spring-cloud-stream-parent</artifactId>
-		<version>1.1.0.M1</version>
+		<artifactId>spring-cloud-build</artifactId>
+		<version>2.1.0.RC3</version>
 		<relativePath />
 	</parent>
 	<properties>
-		<java.version>1.7</java.version>
-		<kafka.version>0.9.0.1</kafka.version>
-		<spring-kafka.version>1.0.3.RELEASE</spring-kafka.version>
-		<spring-integration-kafka.version>2.0.1.RELEASE</spring-integration-kafka.version>
+		<java.version>1.8</java.version>
+		<spring-kafka.version>2.2.0.RELEASE</spring-kafka.version>
+		<spring-integration-kafka.version>3.1.0.RELEASE</spring-integration-kafka.version>
+		<kafka.version>2.0.0</kafka.version>
+		<spring-cloud-stream.version>2.1.0.RC3</spring-cloud-stream.version>
 	</properties>
 	<modules>
 		<module>spring-cloud-stream-binder-kafka</module>
 		<module>spring-cloud-starter-stream-kafka</module>
-		<module>spring-cloud-stream-binder-kafka-test-support</module>
-		<module>spring-cloud-stream-binder-kafka-docs</module>
-	</modules>
+		<module>spring-cloud-stream-binder-kafka-core</module>
+		<module>spring-cloud-stream-binder-kafka-streams</module>
+		<module>docs</module>
+    </modules>
+
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-stream-binder-kafka-core</artifactId>
+				<version>${project.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-stream-binder-kafka</artifactId>
+				<version>${project.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-stream</artifactId>
+				<version>${spring-cloud-stream.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.kafka</groupId>
+				<artifactId>kafka-clients</artifactId>
+				<version>${kafka.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.kafka</groupId>
+				<artifactId>kafka-clients</artifactId>
+				<version>${kafka.version}</version>
+				<classifier>test</classifier>
+				<scope>test</scope>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.kafka</groupId>
+				<artifactId>spring-kafka</artifactId>
+				<version>${spring-kafka.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.integration</groupId>
+				<artifactId>spring-integration-kafka</artifactId>
+				<version>${spring-integration-kafka.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-stream-binder-test</artifactId>
+				<version>${spring-cloud-stream.version}</version>
+				<scope>test</scope>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.kafka</groupId>
+				<artifactId>spring-kafka-test</artifactId>
+				<scope>test</scope>
+				<version>${spring-kafka.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.kafka</groupId>
+				<artifactId>kafka-streams</artifactId>
+				<version>${kafka.version}</version>
+				<exclusions>
+					<exclusion>
+						<groupId>org.slf4j</groupId>
+						<artifactId>slf4j-log4j12</artifactId>
+					</exclusion>
+				</exclusions>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.kafka</groupId>
+				<artifactId>kafka_2.11</artifactId>
+				<classifier>test</classifier>
+				<scope>test</scope>
+				<version>${kafka.version}</version>
+				<exclusions>
+					<exclusion>
+						<groupId>jline</groupId>
+						<artifactId>jline</artifactId>
+					</exclusion>
+					<exclusion>
+						<groupId>org.slf4j</groupId>
+						<artifactId>slf4j-log4j12</artifactId>
+					</exclusion>
+					<exclusion>
+						<groupId>log4j</groupId>
+						<artifactId>log4j</artifactId>
+					</exclusion>
+				</exclusions>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-stream-schema</artifactId>
+				<version>${spring-cloud-stream.version}</version>
+				<scope>test</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
 	<build>
 		<pluginManagement>
 			<plugins>
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-surefire-plugin</artifactId>
-					<configuration>
-						<redirectTestOutputToFile>true</redirectTestOutputToFile>
-					</configuration>
-				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-antrun-plugin</artifactId>
 					<version>1.7</version>
 				</plugin>
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-checkstyle-plugin</artifactId>
-					<version>2.17</version>
-					<dependencies>
-						<dependency>
-							<groupId>com.puppycrawl.tools</groupId>
-							<artifactId>checkstyle</artifactId>
-							<version>6.17</version>
-						</dependency>
-					</dependencies>
-				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-javadoc-plugin</artifactId>
@@ -56,9 +132,48 @@
 						<quiet>true</quiet>
 					</configuration>
 				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-surefire-plugin</artifactId>
+					<configuration>
+						<redirectTestOutputToFile>true</redirectTestOutputToFile>
+					</configuration>
+				</plugin>
 			</plugins>
 		</pluginManagement>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-checkstyle-plugin</artifactId>
+				<dependencies>
+					<dependency>
+						<groupId>org.springframework.cloud</groupId>
+						<artifactId>spring-cloud-stream-tools</artifactId>
+						<version>${spring-cloud-stream.version}</version>
+					</dependency>
+				</dependencies>
+				<executions>
+					<execution>
+						<id>checkstyle-validation</id>
+						<phase>validate</phase>
+						<configuration>
+							<configLocation>checkstyle.xml</configLocation>
+							<headerLocation>checkstyle-header.txt</headerLocation>
+							<suppressionsLocation>checkstyle-suppressions.xml</suppressionsLocation>
+							<encoding>UTF-8</encoding>
+							<consoleOutput>true</consoleOutput>
+							<failsOnError>true</failsOnError>
+							<includeTestSourceDirectory>true</includeTestSourceDirectory>
+						</configuration>
+						<goals>
+							<goal>check</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
 	</build>
+
 	<profiles>
 		<profile>
 			<id>spring</id>

spring-cloud-starter-stream-kafka/pom.xml

@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
-		<version>1.1.0.M1</version>
+		<version>2.1.0.RC3</version>
 	</parent>
 	<artifactId>spring-cloud-starter-stream-kafka</artifactId>
 	<description>Spring Cloud Starter Stream Kafka</description>
@@ -20,7 +20,7 @@
 		<dependency>
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-stream-binder-kafka</artifactId>
-			<version>1.1.0.M1</version>
+			<version>${project.version}</version>
 		</dependency>
 	</dependencies>
 </project>

spring-cloud-stream-binder-kafka-core/.settings/org.eclipse.jdt.ui.prefs

@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.ui.ignorelowercasenames=true
+org.eclipse.jdt.ui.importorder=java;javax;com;org;org.springframework;ch.qos;\#;
+org.eclipse.jdt.ui.ondemandthreshold=99
+org.eclipse.jdt.ui.staticondemandthreshold=99

spring-cloud-stream-binder-kafka-core/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.cloud</groupId>
+		<artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
+		<version>2.1.0.RC3</version>
+	</parent>
+	<artifactId>spring-cloud-stream-binder-kafka-core</artifactId>
+	<description>Spring Cloud Stream Kafka Binder Core</description>
+	<url>http://projects.spring.io/spring-cloud</url>
+	<organization>
+		<name>Pivotal Software, Inc.</name>
+		<url>http://www.spring.io</url>
+	</organization>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.integration</groupId>
+			<artifactId>spring-integration-kafka</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream-binder-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+</project>

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/JaasLoginModuleConfiguration.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2016-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.security.auth.login.AppConfigurationEntry;
+
+import org.springframework.kafka.security.jaas.KafkaJaasLoginModuleInitializer;
+import org.springframework.util.Assert;
+
+/**
+ * Contains properties for setting up an {@link AppConfigurationEntry} that can be used
+ * for the Kafka or Zookeeper client.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ */
+public class JaasLoginModuleConfiguration {
+
+	private String loginModule = "com.sun.security.auth.module.Krb5LoginModule";
+
+	private KafkaJaasLoginModuleInitializer.ControlFlag controlFlag = KafkaJaasLoginModuleInitializer.ControlFlag.REQUIRED;
+
+	private Map<String, String> options = new HashMap<>();
+
+	public String getLoginModule() {
+		return this.loginModule;
+	}
+
+	public void setLoginModule(String loginModule) {
+		Assert.notNull(loginModule, "cannot be null");
+		this.loginModule = loginModule;
+	}
+
+	public KafkaJaasLoginModuleInitializer.ControlFlag getControlFlag() {
+		return this.controlFlag;
+	}
+
+	public void setControlFlag(String controlFlag) {
+		Assert.notNull(controlFlag, "cannot be null");
+		this.controlFlag = KafkaJaasLoginModuleInitializer.ControlFlag.valueOf(controlFlag.toUpperCase());
+	}
+
+	public Map<String, String> getOptions() {
+		return this.options;
+	}
+
+	public void setOptions(Map<String, String> options) {
+		this.options = options;
+	}
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaAdminProperties.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Properties for configuring topics.
+ *
+ * @author Gary Russell
+ * @since 2.0
+ *
+ */
+public class KafkaAdminProperties {
+
+	private Short replicationFactor;
+
+	private Map<Integer, List<Integer>> replicasAssignments = new HashMap<>();
+
+	private Map<String, String> configuration = new HashMap<>();
+
+	public Short getReplicationFactor() {
+		return this.replicationFactor;
+	}
+
+	public void setReplicationFactor(Short replicationFactor) {
+		this.replicationFactor = replicationFactor;
+	}
+
+	public Map<Integer, List<Integer>> getReplicasAssignments() {
+		return this.replicasAssignments;
+	}
+
+	public void setReplicasAssignments(Map<Integer, List<Integer>> replicasAssignments) {
+		this.replicasAssignments = replicasAssignments;
+	}
+
+	public Map<String, String> getConfiguration() {
+		return this.configuration;
+	}
+
+	public void setConfiguration(Map<String, String> configuration) {
+		this.configuration = configuration;
+	}
+
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBinderConfigurationProperties.java

@@ -0,0 +1,782 @@
+/*
+ * Copyright 2015-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.validation.constraints.AssertTrue;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.producer.ProducerConfig;
+
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
+import org.springframework.cloud.stream.binder.HeaderMode;
+import org.springframework.cloud.stream.binder.ProducerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaProducerProperties.CompressionType;
+import org.springframework.expression.Expression;
+import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * Configuration properties for the Kafka binder.
+ * The properties in this class are prefixed with <b>spring.cloud.stream.kafka.binder</b>.
+ *
+ * @author David Turanski
+ * @author Ilayaperumal Gopinathan
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ * @author Gary Russell
+ * @author Rafal Zukowski
+ */
+@ConfigurationProperties(prefix = "spring.cloud.stream.kafka.binder")
+public class KafkaBinderConfigurationProperties {
+
+	private static final String DEFAULT_KAFKA_CONNECTION_STRING = "localhost:9092";
+
+	private final Transaction transaction = new Transaction();
+
+	private final KafkaProperties kafkaProperties;
+
+	private String[] zkNodes = new String[] { "localhost" };
+
+	/**
+	 * Arbitrary kafka properties that apply to both producers and consumers.
+	 */
+	private Map<String, String> configuration = new HashMap<>();
+
+	/**
+	 * Arbitrary kafka consumer properties.
+	 */
+	private Map<String, String> consumerProperties = new HashMap<>();
+
+	/**
+	 * Arbitrary kafka producer properties.
+	 */
+	private Map<String, String> producerProperties = new HashMap<>();
+
+	private String defaultZkPort = "2181";
+
+	private String[] brokers = new String[] { "localhost" };
+
+	private String defaultBrokerPort = "9092";
+
+	private String[] headers = new String[] {};
+
+	private int offsetUpdateTimeWindow = 10000;
+
+	private int offsetUpdateCount;
+
+	private int offsetUpdateShutdownTimeout = 2000;
+
+	private int maxWait = 100;
+
+	private boolean autoCreateTopics = true;
+
+	private boolean autoAddPartitions;
+
+	private int socketBufferSize = 2097152;
+
+	/**
+	 * ZK session timeout in milliseconds.
+	 */
+	private int zkSessionTimeout = 10000;
+
+	/**
+	 * ZK Connection timeout in milliseconds.
+	 */
+	private int zkConnectionTimeout = 10000;
+
+	private String requiredAcks = "1";
+
+	private short replicationFactor = 1;
+
+	private int fetchSize = 1024 * 1024;
+
+	private int minPartitionCount = 1;
+
+	private int queueSize = 8192;
+
+	/**
+	 * Time to wait to get partition information in seconds; default 60.
+	 */
+	private int healthTimeout = 60;
+
+	private JaasLoginModuleConfiguration jaas;
+
+	/**
+	 * The bean name of a custom header mapper to use instead of a {@link org.springframework.kafka.support.DefaultKafkaHeaderMapper}.
+	 */
+	private String headerMapperBeanName;
+
+
+	public KafkaBinderConfigurationProperties(KafkaProperties kafkaProperties) {
+		Assert.notNull(kafkaProperties, "'kafkaProperties' cannot be null");
+		this.kafkaProperties = kafkaProperties;
+	}
+
+	public KafkaProperties getKafkaProperties() {
+		return this.kafkaProperties;
+	}
+
+	public Transaction getTransaction() {
+		return this.transaction;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the connection String
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	@Deprecated
+	public String getZkConnectionString() {
+		return toConnectionString(this.zkNodes, this.defaultZkPort);
+	}
+
+	public String getKafkaConnectionString() {
+		return toConnectionString(this.brokers, this.defaultBrokerPort);
+	}
+
+	public String getDefaultKafkaConnectionString() {
+		return DEFAULT_KAFKA_CONNECTION_STRING;
+	}
+
+	public String[] getHeaders() {
+		return this.headers;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the window.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getOffsetUpdateTimeWindow() {
+		return this.offsetUpdateTimeWindow;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the count.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getOffsetUpdateCount() {
+		return this.offsetUpdateCount;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the timeout.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getOffsetUpdateShutdownTimeout() {
+		return this.offsetUpdateShutdownTimeout;
+	}
+
+	/**
+	 * Zookeeper nodes.
+	 * @return the nodes.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public String[] getZkNodes() {
+		return this.zkNodes;
+	}
+
+	/**
+	 * Zookeeper nodes.
+	 * @param zkNodes the nodes.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public void setZkNodes(String... zkNodes) {
+		this.zkNodes = zkNodes;
+	}
+
+	/**
+	 * Zookeeper port.
+	 * @param defaultZkPort the port.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public void setDefaultZkPort(String defaultZkPort) {
+		this.defaultZkPort = defaultZkPort;
+	}
+
+	public String[] getBrokers() {
+		return this.brokers;
+	}
+
+	public void setBrokers(String... brokers) {
+		this.brokers = brokers;
+	}
+
+	public void setDefaultBrokerPort(String defaultBrokerPort) {
+		this.defaultBrokerPort = defaultBrokerPort;
+	}
+
+	public void setHeaders(String... headers) {
+		this.headers = headers;
+	}
+
+	/**
+	 * No longer used.
+	 * @param offsetUpdateTimeWindow the window.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setOffsetUpdateTimeWindow(int offsetUpdateTimeWindow) {
+		this.offsetUpdateTimeWindow = offsetUpdateTimeWindow;
+	}
+
+	/**
+	 * No longer used.
+	 * @param offsetUpdateCount the count.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setOffsetUpdateCount(int offsetUpdateCount) {
+		this.offsetUpdateCount = offsetUpdateCount;
+	}
+
+	/**
+	 * No longer used.
+	 * @param offsetUpdateShutdownTimeout the timeout.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setOffsetUpdateShutdownTimeout(int offsetUpdateShutdownTimeout) {
+		this.offsetUpdateShutdownTimeout = offsetUpdateShutdownTimeout;
+	}
+
+	/**
+	 * Zookeeper session timeout.
+	 * @return the timeout.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public int getZkSessionTimeout() {
+		return this.zkSessionTimeout;
+	}
+
+	/**
+	 * Zookeeper session timeout.
+	 * @param zkSessionTimeout the timout
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public void setZkSessionTimeout(int zkSessionTimeout) {
+		this.zkSessionTimeout = zkSessionTimeout;
+	}
+
+	/**
+	 * Zookeeper connection timeout.
+	 * @return the timout.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public int getZkConnectionTimeout() {
+		return this.zkConnectionTimeout;
+	}
+
+	/**
+	 * Zookeeper connection timeout.
+	 * @param zkConnectionTimeout the timeout.
+	 * @deprecated connection to zookeeper is no longer necessary
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer necessary since 2.0")
+	public void setZkConnectionTimeout(int zkConnectionTimeout) {
+		this.zkConnectionTimeout = zkConnectionTimeout;
+	}
+
+	/**
+	 * Converts an array of host values to a comma-separated String.
+	 * It will append the default port value, if not already specified.
+	 *
+	 * @param hosts host string
+	 * @param defaultPort port
+	 * @return formatted connection string
+	 */
+	private String toConnectionString(String[] hosts, String defaultPort) {
+		String[] fullyFormattedHosts = new String[hosts.length];
+		for (int i = 0; i < hosts.length; i++) {
+			if (hosts[i].contains(":") || StringUtils.isEmpty(defaultPort)) {
+				fullyFormattedHosts[i] = hosts[i];
+			}
+			else {
+				fullyFormattedHosts[i] = hosts[i] + ":" + defaultPort;
+			}
+		}
+		return StringUtils.arrayToCommaDelimitedString(fullyFormattedHosts);
+	}
+
+	/**
+	 * No longer used.
+	 * @return the wait.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getMaxWait() {
+		return this.maxWait;
+	}
+
+	/**
+	 * No longer user.
+	 * @param maxWait the wait.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setMaxWait(int maxWait) {
+		this.maxWait = maxWait;
+	}
+
+	public String getRequiredAcks() {
+		return this.requiredAcks;
+	}
+
+	public void setRequiredAcks(int requiredAcks) {
+		this.requiredAcks = String.valueOf(requiredAcks);
+	}
+
+	public void setRequiredAcks(String requiredAcks) {
+		this.requiredAcks = requiredAcks;
+	}
+
+	public short getReplicationFactor() {
+		return this.replicationFactor;
+	}
+
+	public void setReplicationFactor(short replicationFactor) {
+		this.replicationFactor = replicationFactor;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getFetchSize() {
+		return this.fetchSize;
+	}
+
+	/**
+	 * No longer used.
+	 * @param fetchSize the size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setFetchSize(int fetchSize) {
+		this.fetchSize = fetchSize;
+	}
+
+	public int getMinPartitionCount() {
+		return this.minPartitionCount;
+	}
+
+	public void setMinPartitionCount(int minPartitionCount) {
+		this.minPartitionCount = minPartitionCount;
+	}
+
+	public int getHealthTimeout() {
+		return this.healthTimeout;
+	}
+
+	public void setHealthTimeout(int healthTimeout) {
+		this.healthTimeout = healthTimeout;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the queue size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public int getQueueSize() {
+		return this.queueSize;
+	}
+
+	/**
+	 * No longer used.
+	 * @param queueSize the queue size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0")
+	public void setQueueSize(int queueSize) {
+		this.queueSize = queueSize;
+	}
+
+	public boolean isAutoCreateTopics() {
+		return this.autoCreateTopics;
+	}
+
+	public void setAutoCreateTopics(boolean autoCreateTopics) {
+		this.autoCreateTopics = autoCreateTopics;
+	}
+
+	public boolean isAutoAddPartitions() {
+		return this.autoAddPartitions;
+	}
+
+	public void setAutoAddPartitions(boolean autoAddPartitions) {
+		this.autoAddPartitions = autoAddPartitions;
+	}
+
+	/**
+	 * No longer used; set properties such as this via {@link #getConfiguration()
+	 * configuration}.
+	 * @return the size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0, set properties such as this via 'configuration'")
+	public int getSocketBufferSize() {
+		return this.socketBufferSize;
+	}
+
+	/**
+	 * No longer used; set properties such as this via {@link #getConfiguration()
+	 * configuration}.
+	 * @param socketBufferSize the size.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Not used since 2.0, set properties such as this via 'configuration'")
+	public void setSocketBufferSize(int socketBufferSize) {
+		this.socketBufferSize = socketBufferSize;
+	}
+
+	public Map<String, String> getConfiguration() {
+		return this.configuration;
+	}
+
+	public void setConfiguration(Map<String, String> configuration) {
+		this.configuration = configuration;
+	}
+
+	public Map<String, String> getConsumerProperties() {
+		return this.consumerProperties;
+	}
+
+	public void setConsumerProperties(Map<String, String> consumerProperties) {
+		Assert.notNull(consumerProperties, "'consumerProperties' cannot be null");
+		this.consumerProperties = consumerProperties;
+	}
+
+	public Map<String, String> getProducerProperties() {
+		return this.producerProperties;
+	}
+
+	public void setProducerProperties(Map<String, String> producerProperties) {
+		Assert.notNull(producerProperties, "'producerProperties' cannot be null");
+		this.producerProperties = producerProperties;
+	}
+
+	/**
+	 * Merge boot consumer properties, general properties from
+	 * {@link #setConfiguration(Map)} that apply to consumers, properties from
+	 * {@link #setConsumerProperties(Map)}, in that order.
+	 * @return the merged properties.
+	 */
+	public Map<String, Object> mergedConsumerConfiguration() {
+		Map<String, Object> consumerConfiguration = new HashMap<>();
+		consumerConfiguration.putAll(this.kafkaProperties.buildConsumerProperties());
+		// Copy configured binder properties that apply to consumers
+		for (Map.Entry<String, String> configurationEntry : this.configuration.entrySet()) {
+			if (ConsumerConfig.configNames().contains(configurationEntry.getKey())) {
+				consumerConfiguration.put(configurationEntry.getKey(), configurationEntry.getValue());
+			}
+		}
+		consumerConfiguration.putAll(this.consumerProperties);
+		// Override Spring Boot bootstrap server setting if left to default with the value
+		// configured in the binder
+		return getConfigurationWithBootstrapServer(consumerConfiguration, ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG);
+	}
+
+	/**
+	 * Merge boot producer properties, general properties from
+	 * {@link #setConfiguration(Map)} that apply to producers, properties from
+	 * {@link #setProducerProperties(Map)}, in that order.
+	 * @return the merged properties.
+	 */
+	public Map<String, Object> mergedProducerConfiguration() {
+		Map<String, Object> producerConfiguration = new HashMap<>();
+		producerConfiguration.putAll(this.kafkaProperties.buildProducerProperties());
+		// Copy configured binder properties that apply to producers
+		for (Map.Entry<String, String> configurationEntry : this.configuration.entrySet()) {
+			if (ProducerConfig.configNames().contains(configurationEntry.getKey())) {
+				producerConfiguration.put(configurationEntry.getKey(), configurationEntry.getValue());
+			}
+		}
+		producerConfiguration.putAll(this.producerProperties);
+		// Override Spring Boot bootstrap server setting if left to default with the value
+		// configured in the binder
+		return getConfigurationWithBootstrapServer(producerConfiguration, ProducerConfig.BOOTSTRAP_SERVERS_CONFIG);
+	}
+
+	private Map<String, Object> getConfigurationWithBootstrapServer(Map<String, Object> configuration, String bootstrapServersConfig) {
+		if (ObjectUtils.isEmpty(configuration.get(bootstrapServersConfig))) {
+			configuration.put(bootstrapServersConfig, getKafkaConnectionString());
+		}
+		else {
+			Object boostrapServersConfig = configuration.get(bootstrapServersConfig);
+			if (boostrapServersConfig instanceof List) {
+				@SuppressWarnings("unchecked")
+				List<String> bootStrapServers = (List<String>) configuration
+						.get(bootstrapServersConfig);
+				if (bootStrapServers.size() == 1 && bootStrapServers.get(0).equals("localhost:9092")) {
+					configuration.put(bootstrapServersConfig, getKafkaConnectionString());
+				}
+			}
+		}
+		return Collections.unmodifiableMap(configuration);
+	}
+
+	public JaasLoginModuleConfiguration getJaas() {
+		return this.jaas;
+	}
+
+	public void setJaas(JaasLoginModuleConfiguration jaas) {
+		this.jaas = jaas;
+	}
+
+	public String getHeaderMapperBeanName() {
+		return this.headerMapperBeanName;
+	}
+
+	public void setHeaderMapperBeanName(String headerMapperBeanName) {
+		this.headerMapperBeanName = headerMapperBeanName;
+	}
+
+	/**
+	 * Domain class that models transaction capabilities in Kafka.
+	 */
+	public static class Transaction {
+
+		private final CombinedProducerProperties producer = new CombinedProducerProperties();
+
+		private String transactionIdPrefix;
+
+		public String getTransactionIdPrefix() {
+			return this.transactionIdPrefix;
+		}
+
+		public void setTransactionIdPrefix(String transactionIdPrefix) {
+			this.transactionIdPrefix = transactionIdPrefix;
+		}
+
+		public CombinedProducerProperties getProducer() {
+			return this.producer;
+		}
+
+	}
+
+	/**
+	 * An combination of {@link ProducerProperties} and {@link KafkaProducerProperties}
+	 * so that common and kafka-specific properties can be set for the transactional
+	 * producer.
+	 * @since 2.1
+	 */
+	public static class CombinedProducerProperties {
+
+		private final ProducerProperties producerProperties = new ProducerProperties();
+
+		private final KafkaProducerProperties kafkaProducerProperties = new KafkaProducerProperties();
+
+		public Expression getPartitionKeyExpression() {
+			return this.producerProperties.getPartitionKeyExpression();
+		}
+
+		public void setPartitionKeyExpression(Expression partitionKeyExpression) {
+			this.producerProperties.setPartitionKeyExpression(partitionKeyExpression);
+		}
+
+		public boolean isPartitioned() {
+			return this.producerProperties.isPartitioned();
+		}
+
+		public Expression getPartitionSelectorExpression() {
+			return this.producerProperties.getPartitionSelectorExpression();
+		}
+
+		public void setPartitionSelectorExpression(Expression partitionSelectorExpression) {
+			this.producerProperties.setPartitionSelectorExpression(partitionSelectorExpression);
+		}
+
+		public @Min(value = 1, message = "Partition count should be greater than zero.") int getPartitionCount() {
+			return this.producerProperties.getPartitionCount();
+		}
+
+		public void setPartitionCount(int partitionCount) {
+			this.producerProperties.setPartitionCount(partitionCount);
+		}
+
+		public String[] getRequiredGroups() {
+			return this.producerProperties.getRequiredGroups();
+		}
+
+		public void setRequiredGroups(String... requiredGroups) {
+			this.producerProperties.setRequiredGroups(requiredGroups);
+		}
+
+		public @AssertTrue(message = "Partition key expression and partition key extractor class properties are mutually exclusive.") boolean isValidPartitionKeyProperty() {
+			return this.producerProperties.isValidPartitionKeyProperty();
+		}
+
+		public @AssertTrue(message = "Partition selector class and partition selector expression properties are mutually exclusive.") boolean isValidPartitionSelectorProperty() {
+			return this.producerProperties.isValidPartitionSelectorProperty();
+		}
+
+		public HeaderMode getHeaderMode() {
+			return this.producerProperties.getHeaderMode();
+		}
+
+		public void setHeaderMode(HeaderMode headerMode) {
+			this.producerProperties.setHeaderMode(headerMode);
+		}
+
+		public boolean isUseNativeEncoding() {
+			return this.producerProperties.isUseNativeEncoding();
+		}
+
+		public void setUseNativeEncoding(boolean useNativeEncoding) {
+			this.producerProperties.setUseNativeEncoding(useNativeEncoding);
+		}
+
+		public boolean isErrorChannelEnabled() {
+			return this.producerProperties.isErrorChannelEnabled();
+		}
+
+		public void setErrorChannelEnabled(boolean errorChannelEnabled) {
+			this.producerProperties.setErrorChannelEnabled(errorChannelEnabled);
+		}
+
+		public String getPartitionKeyExtractorName() {
+			return this.producerProperties.getPartitionKeyExtractorName();
+		}
+
+		public void setPartitionKeyExtractorName(String partitionKeyExtractorName) {
+			this.producerProperties.setPartitionKeyExtractorName(partitionKeyExtractorName);
+		}
+
+		public String getPartitionSelectorName() {
+			return this.producerProperties.getPartitionSelectorName();
+		}
+
+		public void setPartitionSelectorName(String partitionSelectorName) {
+			this.producerProperties.setPartitionSelectorName(partitionSelectorName);
+		}
+
+		public int getBufferSize() {
+			return this.kafkaProducerProperties.getBufferSize();
+		}
+
+		public void setBufferSize(int bufferSize) {
+			this.kafkaProducerProperties.setBufferSize(bufferSize);
+		}
+
+		public @NotNull CompressionType getCompressionType() {
+			return this.kafkaProducerProperties.getCompressionType();
+		}
+
+		public void setCompressionType(CompressionType compressionType) {
+			this.kafkaProducerProperties.setCompressionType(compressionType);
+		}
+
+		public boolean isSync() {
+			return this.kafkaProducerProperties.isSync();
+		}
+
+		public void setSync(boolean sync) {
+			this.kafkaProducerProperties.setSync(sync);
+		}
+
+		public int getBatchTimeout() {
+			return this.kafkaProducerProperties.getBatchTimeout();
+		}
+
+		public void setBatchTimeout(int batchTimeout) {
+			this.kafkaProducerProperties.setBatchTimeout(batchTimeout);
+		}
+
+		public Expression getMessageKeyExpression() {
+			return this.kafkaProducerProperties.getMessageKeyExpression();
+		}
+
+		public void setMessageKeyExpression(Expression messageKeyExpression) {
+			this.kafkaProducerProperties.setMessageKeyExpression(messageKeyExpression);
+		}
+
+		public String[] getHeaderPatterns() {
+			return this.kafkaProducerProperties.getHeaderPatterns();
+		}
+
+		public void setHeaderPatterns(String[] headerPatterns) {
+			this.kafkaProducerProperties.setHeaderPatterns(headerPatterns);
+		}
+
+		public Map<String, String> getConfiguration() {
+			return this.kafkaProducerProperties.getConfiguration();
+		}
+
+		public void setConfiguration(Map<String, String> configuration) {
+			this.kafkaProducerProperties.setConfiguration(configuration);
+		}
+
+		public KafkaAdminProperties getAdmin() {
+			return this.kafkaProducerProperties.getAdmin();
+		}
+
+		public void setAdmin(KafkaAdminProperties admin) {
+			this.kafkaProducerProperties.setAdmin(admin);
+		}
+
+		public KafkaProducerProperties getExtension() {
+			return this.kafkaProducerProperties;
+		}
+	}
+
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaBindingProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 the original author or authors.
+ * Copyright 2016-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,19 +14,24 @@
  * limitations under the License.
  */
 
-package org.springframework.cloud.stream.binder.kafka;
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import org.springframework.cloud.stream.binder.BinderSpecificPropertiesProvider;
 
 /**
+ * Container object for Kafka specific extended producer and consumer binding properties.
+ *
  * @author Marius Bogoevici
+ * @author Oleg Zhurakousky
  */
-public class KafkaBindingProperties {
+public class KafkaBindingProperties implements BinderSpecificPropertiesProvider {
 
 	private KafkaConsumerProperties consumer = new KafkaConsumerProperties();
 
 	private KafkaProducerProperties producer = new KafkaProducerProperties();
 
 	public KafkaConsumerProperties getConsumer() {
-		return consumer;
+		return this.consumer;
 	}
 
 	public void setConsumer(KafkaConsumerProperties consumer) {
@@ -34,7 +39,7 @@ public class KafkaBindingProperties {
 	}
 
 	public KafkaProducerProperties getProducer() {
-		return producer;
+		return this.producer;
 	}
 
 	public void setProducer(KafkaProducerProperties producer) {

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaConsumerProperties.java

@@ -0,0 +1,264 @@
+/*
+ * Copyright 2016-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+/**
+ * Extended consumer properties for Kafka binder.
+ *
+ * @author Marius Bogoevici
+ * @author Ilayaperumal Gopinathan
+ * @author Soby Chacko
+ * @author Gary Russell
+ *
+ * <p>
+ * Thanks to Laszlo Szabo for providing the initial patch for generic property support.
+ * </p>
+ */
+public class KafkaConsumerProperties {
+
+	/**
+	 * Enumeration for starting consumer offset.
+	 */
+	public enum StartOffset {
+		/**
+		 * Starting from earliest offset.
+		 */
+		earliest(-2L),
+		/**
+		 * Starting from latest offset.
+		 */
+		latest(-1L);
+
+		private final long referencePoint;
+
+		StartOffset(long referencePoint) {
+			this.referencePoint = referencePoint;
+		}
+
+		public long getReferencePoint() {
+			return this.referencePoint;
+		}
+	}
+
+	/**
+	 * Standard headers for the message.
+	 */
+	public enum StandardHeaders {
+		/**
+		 * No headers.
+		 */
+		none,
+		/**
+		 * Message header representing ID.
+		 */
+		id,
+		/**
+		 * Message header representing timestamp.
+		 */
+		timestamp,
+		/**
+		 * Indicating both ID and timestamp headers.
+		 */
+		both
+	}
+
+	private boolean ackEachRecord;
+
+	private boolean autoRebalanceEnabled = true;
+
+	private boolean autoCommitOffset = true;
+
+	private Boolean autoCommitOnError;
+
+	private StartOffset startOffset;
+
+	private boolean resetOffsets;
+
+	private boolean enableDlq;
+
+	private String dlqName;
+
+	private KafkaProducerProperties dlqProducerProperties = new KafkaProducerProperties();
+
+	private int recoveryInterval = 5000;
+
+	private String[] trustedPackages;
+
+	private StandardHeaders standardHeaders = StandardHeaders.none;
+
+	private String converterBeanName;
+
+	private long idleEventInterval = 30_000;
+
+	private boolean destinationIsPattern;
+
+	private Map<String, String> configuration = new HashMap<>();
+
+	private KafkaAdminProperties admin = new KafkaAdminProperties();
+
+	public boolean isAckEachRecord() {
+		return this.ackEachRecord;
+	}
+
+	public void setAckEachRecord(boolean ackEachRecord) {
+		this.ackEachRecord = ackEachRecord;
+	}
+
+	public boolean isAutoCommitOffset() {
+		return this.autoCommitOffset;
+	}
+
+	public void setAutoCommitOffset(boolean autoCommitOffset) {
+		this.autoCommitOffset = autoCommitOffset;
+	}
+
+	public StartOffset getStartOffset() {
+		return this.startOffset;
+	}
+
+	public void setStartOffset(StartOffset startOffset) {
+		this.startOffset = startOffset;
+	}
+
+	public boolean isResetOffsets() {
+		return this.resetOffsets;
+	}
+
+	public void setResetOffsets(boolean resetOffsets) {
+		this.resetOffsets = resetOffsets;
+	}
+
+	public boolean isEnableDlq() {
+		return this.enableDlq;
+	}
+
+	public void setEnableDlq(boolean enableDlq) {
+		this.enableDlq = enableDlq;
+	}
+
+	public Boolean getAutoCommitOnError() {
+		return this.autoCommitOnError;
+	}
+
+	public void setAutoCommitOnError(Boolean autoCommitOnError) {
+		this.autoCommitOnError = autoCommitOnError;
+	}
+
+	/**
+	 * No longer used.
+	 * @return the interval.
+	 * @deprecated No longer used by the binder
+	 */
+	@Deprecated
+	public int getRecoveryInterval() {
+		return this.recoveryInterval;
+	}
+
+	/**
+	 * No longer used.
+	 * @param recoveryInterval the interval.
+	 * @deprecated No longer needed by the binder
+	 */
+	@Deprecated
+	public void setRecoveryInterval(int recoveryInterval) {
+		this.recoveryInterval = recoveryInterval;
+	}
+
+	public boolean isAutoRebalanceEnabled() {
+		return this.autoRebalanceEnabled;
+	}
+
+	public void setAutoRebalanceEnabled(boolean autoRebalanceEnabled) {
+		this.autoRebalanceEnabled = autoRebalanceEnabled;
+	}
+
+	public Map<String, String> getConfiguration() {
+		return this.configuration;
+	}
+
+	public void setConfiguration(Map<String, String> configuration) {
+		this.configuration = configuration;
+	}
+
+	public String getDlqName() {
+		return this.dlqName;
+	}
+
+	public void setDlqName(String dlqName) {
+		this.dlqName = dlqName;
+	}
+
+	public String[] getTrustedPackages() {
+		return this.trustedPackages;
+	}
+
+	public void setTrustedPackages(String[] trustedPackages) {
+		this.trustedPackages = trustedPackages;
+	}
+
+	public KafkaProducerProperties getDlqProducerProperties() {
+		return this.dlqProducerProperties;
+	}
+
+	public void setDlqProducerProperties(KafkaProducerProperties dlqProducerProperties) {
+		this.dlqProducerProperties = dlqProducerProperties;
+	}
+	public StandardHeaders getStandardHeaders() {
+		return this.standardHeaders;
+	}
+
+	public void setStandardHeaders(StandardHeaders standardHeaders) {
+		this.standardHeaders = standardHeaders;
+	}
+
+	public String getConverterBeanName() {
+		return this.converterBeanName;
+	}
+
+	public void setConverterBeanName(String converterBeanName) {
+		this.converterBeanName = converterBeanName;
+	}
+
+	public long getIdleEventInterval() {
+		return this.idleEventInterval;
+	}
+
+	public void setIdleEventInterval(long idleEventInterval) {
+		this.idleEventInterval = idleEventInterval;
+	}
+
+	public boolean isDestinationIsPattern() {
+		return this.destinationIsPattern;
+	}
+
+	public void setDestinationIsPattern(boolean destinationIsPattern) {
+		this.destinationIsPattern = destinationIsPattern;
+	}
+
+	public KafkaAdminProperties getAdmin() {
+		return this.admin;
+	}
+
+	public void setAdmin(KafkaAdminProperties admin) {
+		this.admin = admin;
+	}
+
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaExtendedBindingProperties.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2016-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.properties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.cloud.stream.binder.AbstractExtendedBindingProperties;
+import org.springframework.cloud.stream.binder.BinderSpecificPropertiesProvider;
+
+/**
+ * Kafka specific extended binding properties class that extends from {@link AbstractExtendedBindingProperties}.
+ *
+ * @author Marius Bogoevici
+ * @author Gary Russell
+ * @author Soby Chacko
+ * @author Oleg Zhurakousky
+ */
+@ConfigurationProperties("spring.cloud.stream.kafka")
+public class KafkaExtendedBindingProperties
+	extends AbstractExtendedBindingProperties<KafkaConsumerProperties, KafkaProducerProperties, KafkaBindingProperties> {
+
+	private static final String DEFAULTS_PREFIX = "spring.cloud.stream.kafka.default";
+
+	@Override
+	public String getDefaultsPrefix() {
+		return DEFAULTS_PREFIX;
+	}
+
+	@Override
+	public Class<? extends BinderSpecificPropertiesProvider> getExtendedPropertiesEntryClass() {
+		return KafkaBindingProperties.class;
+	}
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/properties/KafkaProducerProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 the original author or authors.
+ * Copyright 2016-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,15 +14,21 @@
  * limitations under the License.
  */
 
-package org.springframework.cloud.stream.binder.kafka;
+package org.springframework.cloud.stream.binder.kafka.properties;
 
 import java.util.HashMap;
 import java.util.Map;
 
 import javax.validation.constraints.NotNull;
 
+import org.springframework.expression.Expression;
+
 /**
+ * Extended producer properties for Kafka binder.
+ *
  * @author Marius Bogoevici
+ * @author Henryk Konsek
+ * @author Gary Russell
  */
 public class KafkaProducerProperties {
 
@@ -34,8 +40,14 @@ public class KafkaProducerProperties {
 
 	private int batchTimeout;
 
+	private Expression messageKeyExpression;
+
+	private String[] headerPatterns;
+
 	private Map<String, String> configuration = new HashMap<>();
 
+	private KafkaAdminProperties admin = new KafkaAdminProperties();
+
 	public int getBufferSize() {
 		return this.bufferSize;
 	}
@@ -69,6 +81,22 @@ public class KafkaProducerProperties {
 		this.batchTimeout = batchTimeout;
 	}
 
+	public Expression getMessageKeyExpression() {
+		return this.messageKeyExpression;
+	}
+
+	public void setMessageKeyExpression(Expression messageKeyExpression) {
+		this.messageKeyExpression = messageKeyExpression;
+	}
+
+	public String[] getHeaderPatterns() {
+		return this.headerPatterns;
+	}
+
+	public void setHeaderPatterns(String[] headerPatterns) {
+		this.headerPatterns = headerPatterns;
+	}
+
 	public Map<String, String> getConfiguration() {
 		return this.configuration;
 	}
@@ -77,9 +105,29 @@ public class KafkaProducerProperties {
 		this.configuration = configuration;
 	}
 
+	public KafkaAdminProperties getAdmin() {
+		return this.admin;
+	}
+
+	public void setAdmin(KafkaAdminProperties admin) {
+		this.admin = admin;
+	}
+
+	/**
+	 * Enumeration for compression types.
+	 */
 	public enum CompressionType {
+		/**
+		 * No compression.
+		 */
 		none,
+		/**
+		 * gzip based compression.
+		 */
 		gzip,
+		/**
+		 * snappy based compression.
+		 */
 		snappy
 	}
 }

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisioner.java

@@ -0,0 +1,521 @@
+/*
+ * Copyright 2014-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.provisioning;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.clients.admin.AdminClient;
+import org.apache.kafka.clients.admin.AdminClientConfig;
+import org.apache.kafka.clients.admin.CreatePartitionsResult;
+import org.apache.kafka.clients.admin.CreateTopicsResult;
+import org.apache.kafka.clients.admin.DescribeTopicsResult;
+import org.apache.kafka.clients.admin.ListTopicsResult;
+import org.apache.kafka.clients.admin.NewPartitions;
+import org.apache.kafka.clients.admin.NewTopic;
+import org.apache.kafka.clients.admin.TopicDescription;
+import org.apache.kafka.common.KafkaFuture;
+import org.apache.kafka.common.PartitionInfo;
+import org.apache.kafka.common.errors.TopicExistsException;
+import org.apache.kafka.common.errors.UnknownTopicOrPartitionException;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.cloud.stream.binder.BinderException;
+import org.springframework.cloud.stream.binder.ExtendedConsumerProperties;
+import org.springframework.cloud.stream.binder.ExtendedProducerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaAdminProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaProducerProperties;
+import org.springframework.cloud.stream.binder.kafka.utils.KafkaTopicUtils;
+import org.springframework.cloud.stream.provisioning.ConsumerDestination;
+import org.springframework.cloud.stream.provisioning.ProducerDestination;
+import org.springframework.cloud.stream.provisioning.ProvisioningException;
+import org.springframework.cloud.stream.provisioning.ProvisioningProvider;
+import org.springframework.retry.RetryOperations;
+import org.springframework.retry.backoff.ExponentialBackOffPolicy;
+import org.springframework.retry.policy.SimpleRetryPolicy;
+import org.springframework.retry.support.RetryTemplate;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * Kafka implementation for {@link ProvisioningProvider}.
+ *
+ * @author Soby Chacko
+ * @author Gary Russell
+ * @author Ilayaperumal Gopinathan
+ * @author Simon Flandergan
+ * @author Oleg Zhurakousky
+ */
+public class KafkaTopicProvisioner implements ProvisioningProvider<ExtendedConsumerProperties<KafkaConsumerProperties>,
+		ExtendedProducerProperties<KafkaProducerProperties>>, InitializingBean {
+
+	private static final int DEFAULT_OPERATION_TIMEOUT = 30;
+
+	private final Log logger = LogFactory.getLog(getClass());
+
+	private final KafkaBinderConfigurationProperties configurationProperties;
+
+	private final int operationTimeout = DEFAULT_OPERATION_TIMEOUT;
+
+	private final Map<String, Object> adminClientProperties;
+
+	private RetryOperations metadataRetryOperations;
+
+	public KafkaTopicProvisioner(KafkaBinderConfigurationProperties kafkaBinderConfigurationProperties,
+								KafkaProperties kafkaProperties) {
+		Assert.isTrue(kafkaProperties != null, "KafkaProperties cannot be null");
+		this.adminClientProperties = kafkaProperties.buildAdminProperties();
+		this.configurationProperties = kafkaBinderConfigurationProperties;
+		normalalizeBootPropsWithBinder(this.adminClientProperties, kafkaProperties, kafkaBinderConfigurationProperties);
+	}
+
+	/**
+	 * Mutator for metadata retry operations.
+	 *
+	 * @param metadataRetryOperations the retry configuration
+	 */
+	public void setMetadataRetryOperations(RetryOperations metadataRetryOperations) {
+		this.metadataRetryOperations = metadataRetryOperations;
+	}
+
+	@Override
+	public void afterPropertiesSet() throws Exception {
+		if (this.metadataRetryOperations == null) {
+			RetryTemplate retryTemplate = new RetryTemplate();
+
+			SimpleRetryPolicy simpleRetryPolicy = new SimpleRetryPolicy();
+			simpleRetryPolicy.setMaxAttempts(10);
+			retryTemplate.setRetryPolicy(simpleRetryPolicy);
+
+			ExponentialBackOffPolicy backOffPolicy = new ExponentialBackOffPolicy();
+			backOffPolicy.setInitialInterval(100);
+			backOffPolicy.setMultiplier(2);
+			backOffPolicy.setMaxInterval(1000);
+			retryTemplate.setBackOffPolicy(backOffPolicy);
+			this.metadataRetryOperations = retryTemplate;
+		}
+	}
+
+	@Override
+	public ProducerDestination provisionProducerDestination(final String name,
+			ExtendedProducerProperties<KafkaProducerProperties> properties) {
+
+		if (this.logger.isInfoEnabled()) {
+			this.logger.info("Using kafka topic for outbound: " + name);
+		}
+		KafkaTopicUtils.validateTopicName(name);
+		try (AdminClient adminClient = AdminClient.create(this.adminClientProperties)) {
+			createTopic(adminClient, name, properties.getPartitionCount(), false, properties.getExtension().getAdmin());
+			int partitions = 0;
+			if (this.configurationProperties.isAutoCreateTopics()) {
+				DescribeTopicsResult describeTopicsResult = adminClient.describeTopics(Collections.singletonList(name));
+				KafkaFuture<Map<String, TopicDescription>> all = describeTopicsResult.all();
+
+				Map<String, TopicDescription> topicDescriptions = null;
+				try {
+					topicDescriptions = all.get(this.operationTimeout, TimeUnit.SECONDS);
+				}
+				catch (Exception ex) {
+					throw new ProvisioningException("Problems encountered with partitions finding", ex);
+				}
+				TopicDescription topicDescription = topicDescriptions.get(name);
+				partitions = topicDescription.partitions().size();
+			}
+			return new KafkaProducerDestination(name, partitions);
+		}
+	}
+
+	@Override
+	public ConsumerDestination provisionConsumerDestination(final String name, final String group,
+			ExtendedConsumerProperties<KafkaConsumerProperties> properties) {
+		if (!properties.isMultiplex()) {
+			return doProvisionConsumerDestination(name, group, properties);
+		}
+		else {
+			String[] destinations = StringUtils.commaDelimitedListToStringArray(name);
+			for (String destination : destinations) {
+				doProvisionConsumerDestination(destination.trim(), group, properties);
+			}
+			return new KafkaConsumerDestination(name);
+		}
+	}
+
+	private ConsumerDestination doProvisionConsumerDestination(final String name, final String group,
+			ExtendedConsumerProperties<KafkaConsumerProperties> properties) {
+
+		if (properties.getExtension().isDestinationIsPattern()) {
+			Assert.isTrue(!properties.getExtension().isEnableDlq(),
+					"enableDLQ is not allowed when listening to topic patterns");
+			if (this.logger.isDebugEnabled()) {
+				this.logger.debug("Listening to a topic pattern - " + name
+						+ " - no provisioning performed");
+			}
+			return new KafkaConsumerDestination(name);
+		}
+		KafkaTopicUtils.validateTopicName(name);
+		boolean anonymous = !StringUtils.hasText(group);
+		Assert.isTrue(!anonymous || !properties.getExtension().isEnableDlq(),
+				"DLQ support is not available for anonymous subscriptions");
+		if (properties.getInstanceCount() == 0) {
+			throw new IllegalArgumentException("Instance count cannot be zero");
+		}
+		int partitionCount = properties.getInstanceCount() * properties.getConcurrency();
+		ConsumerDestination consumerDestination = new KafkaConsumerDestination(name);
+		try (AdminClient adminClient = createAdminClient()) {
+			createTopic(adminClient, name, partitionCount, properties.getExtension().isAutoRebalanceEnabled(),
+					properties.getExtension().getAdmin());
+			if (this.configurationProperties.isAutoCreateTopics()) {
+				DescribeTopicsResult describeTopicsResult = adminClient.describeTopics(Collections.singletonList(name));
+				KafkaFuture<Map<String, TopicDescription>> all = describeTopicsResult.all();
+				try {
+					Map<String, TopicDescription> topicDescriptions = all.get(this.operationTimeout, TimeUnit.SECONDS);
+					TopicDescription topicDescription = topicDescriptions.get(name);
+					int partitions = topicDescription.partitions().size();
+					consumerDestination = createDlqIfNeedBe(adminClient, name, group, properties, anonymous, partitions);
+					if (consumerDestination == null) {
+						consumerDestination = new KafkaConsumerDestination(name, partitions);
+					}
+				}
+				catch (Exception ex) {
+					throw new ProvisioningException("provisioning exception", ex);
+				}
+			}
+		}
+		return consumerDestination;
+	}
+
+	AdminClient createAdminClient() {
+		return AdminClient.create(this.adminClientProperties);
+	}
+
+	/**
+	 * In general, binder properties supersede boot kafka properties.
+	 * The one exception is the bootstrap servers. In that case, we should only override
+	 * the boot properties if (there is a binder property AND it is a non-default value)
+	 * OR (if there is no boot property); this is needed because the binder property
+	 * never returns a null value.
+	 * @param adminProps the admin properties to normalize.
+	 * @param bootProps the boot kafka properties.
+	 * @param binderProps the binder kafka properties.
+	 */
+	private void normalalizeBootPropsWithBinder(Map<String, Object> adminProps, KafkaProperties bootProps,
+			KafkaBinderConfigurationProperties binderProps) {
+		// First deal with the outlier
+		String kafkaConnectionString = binderProps.getKafkaConnectionString();
+		if (ObjectUtils.isEmpty(adminProps.get(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG))
+				|| !kafkaConnectionString.equals(binderProps.getDefaultKafkaConnectionString())) {
+			adminProps.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaConnectionString);
+		}
+		// Now override any boot values with binder values
+		Map<String, String> binderProperties = binderProps.getConfiguration();
+		Set<String> adminConfigNames = AdminClientConfig.configNames();
+		binderProperties.forEach((key, value) -> {
+			if (key.equals(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG)) {
+				throw new IllegalStateException(
+						"Set binder bootstrap servers via the 'brokers' property, not 'configuration'");
+			}
+			if (adminConfigNames.contains(key)) {
+				Object replaced = adminProps.put(key, value);
+				if (replaced != null && this.logger.isDebugEnabled()) {
+					this.logger.debug("Overrode boot property: [" + key + "], from: [" + replaced + "] to: [" + value + "]");
+				}
+			}
+		});
+	}
+
+	private ConsumerDestination createDlqIfNeedBe(AdminClient adminClient, String name, String group,
+												ExtendedConsumerProperties<KafkaConsumerProperties> properties,
+												boolean anonymous, int partitions) {
+		if (properties.getExtension().isEnableDlq() && !anonymous) {
+			String dlqTopic = StringUtils.hasText(properties.getExtension().getDlqName()) ?
+					properties.getExtension().getDlqName() : "error." + name + "." + group;
+			try {
+				createTopicAndPartitions(adminClient, dlqTopic, partitions,
+						properties.getExtension().isAutoRebalanceEnabled(), properties.getExtension().getAdmin());
+			}
+			catch (Throwable throwable) {
+				if (throwable instanceof Error) {
+					throw (Error) throwable;
+				}
+				else {
+					throw new ProvisioningException("provisioning exception", throwable);
+				}
+			}
+			return new KafkaConsumerDestination(name, partitions, dlqTopic);
+		}
+		return null;
+	}
+
+	private void createTopic(AdminClient adminClient, String name, int partitionCount, boolean tolerateLowerPartitionsOnBroker,
+			KafkaAdminProperties properties) {
+		try {
+			createTopicIfNecessary(adminClient, name, partitionCount, tolerateLowerPartitionsOnBroker, properties);
+		}
+		//TODO: Remove catching Throwable. See this thread: https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/pull/514#discussion_r241075940
+		catch (Throwable throwable) {
+			if (throwable instanceof Error) {
+				throw (Error) throwable;
+			}
+			else {
+				//TODO: https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/pull/514#discussion_r241075940
+				throw new ProvisioningException("Provisioning exception", throwable);
+			}
+		}
+	}
+
+	private void createTopicIfNecessary(AdminClient adminClient, final String topicName, final int partitionCount,
+			boolean tolerateLowerPartitionsOnBroker, KafkaAdminProperties properties) throws Throwable {
+
+		if (this.configurationProperties.isAutoCreateTopics()) {
+			createTopicAndPartitions(adminClient, topicName, partitionCount, tolerateLowerPartitionsOnBroker,
+					properties);
+		}
+		else {
+			this.logger.info("Auto creation of topics is disabled.");
+		}
+	}
+
+	/**
+	 * Creates a Kafka topic if needed, or try to increase its partition count to the
+	 * desired number.
+	 * @param adminClient kafka admin client
+	 * @param topicName topic name
+	 * @param partitionCount partition count
+	 * @param tolerateLowerPartitionsOnBroker whether lower partitions count on broker is tolerated ot not
+	 * @param adminProperties kafka admin properties
+	 * @throws Throwable from topic creation
+	 */
+	private void createTopicAndPartitions(AdminClient adminClient, final String topicName, final int partitionCount,
+			boolean tolerateLowerPartitionsOnBroker, KafkaAdminProperties adminProperties) throws Throwable {
+
+		ListTopicsResult listTopicsResult = adminClient.listTopics();
+		KafkaFuture<Set<String>> namesFutures = listTopicsResult.names();
+
+		Set<String> names = namesFutures.get(this.operationTimeout, TimeUnit.SECONDS);
+		if (names.contains(topicName)) {
+			// only consider minPartitionCount for resizing if autoAddPartitions is true
+			int effectivePartitionCount = this.configurationProperties.isAutoAddPartitions()
+					? Math.max(this.configurationProperties.getMinPartitionCount(), partitionCount)
+					: partitionCount;
+			DescribeTopicsResult describeTopicsResult = adminClient.describeTopics(Collections.singletonList(topicName));
+			KafkaFuture<Map<String, TopicDescription>> topicDescriptionsFuture = describeTopicsResult.all();
+			Map<String, TopicDescription> topicDescriptions = topicDescriptionsFuture.get(this.operationTimeout, TimeUnit.SECONDS);
+			TopicDescription topicDescription = topicDescriptions.get(topicName);
+			int partitionSize = topicDescription.partitions().size();
+			if (partitionSize < effectivePartitionCount) {
+				if (this.configurationProperties.isAutoAddPartitions()) {
+					CreatePartitionsResult partitions = adminClient.createPartitions(
+							Collections.singletonMap(topicName, NewPartitions.increaseTo(effectivePartitionCount)));
+					partitions.all().get(this.operationTimeout, TimeUnit.SECONDS);
+				}
+				else if (tolerateLowerPartitionsOnBroker) {
+					this.logger.warn("The number of expected partitions was: " + partitionCount + ", but "
+							+ partitionSize + (partitionSize > 1 ? " have " : " has ") + "been found instead."
+							+ "There will be " + (effectivePartitionCount - partitionSize) + " idle consumers");
+				}
+				else {
+					throw new ProvisioningException("The number of expected partitions was: " + partitionCount + ", but "
+							+ partitionSize + (partitionSize > 1 ? " have " : " has ") + "been found instead."
+							+ "Consider either increasing the partition count of the topic or enabling " +
+							"`autoAddPartitions`");
+				}
+			}
+		}
+		else {
+			// always consider minPartitionCount for topic creation
+			final int effectivePartitionCount = Math.max(this.configurationProperties.getMinPartitionCount(),
+					partitionCount);
+			this.metadataRetryOperations.execute((context) -> {
+
+				NewTopic newTopic;
+				Map<Integer, List<Integer>> replicasAssignments = adminProperties.getReplicasAssignments();
+				if (replicasAssignments != null &&  replicasAssignments.size() > 0) {
+					newTopic = new NewTopic(topicName, adminProperties.getReplicasAssignments());
+				}
+				else {
+					newTopic = new NewTopic(topicName, effectivePartitionCount,
+							adminProperties.getReplicationFactor() != null
+									? adminProperties.getReplicationFactor()
+									: this.configurationProperties.getReplicationFactor());
+				}
+				if (adminProperties.getConfiguration().size() > 0) {
+					newTopic.configs(adminProperties.getConfiguration());
+				}
+				CreateTopicsResult createTopicsResult = adminClient.createTopics(Collections.singletonList(newTopic));
+				try {
+					createTopicsResult.all().get(this.operationTimeout, TimeUnit.SECONDS);
+				}
+				catch (Exception ex) {
+					if (ex instanceof ExecutionException) {
+						if (ex.getCause() instanceof TopicExistsException) {
+							if (this.logger.isWarnEnabled()) {
+								this.logger.warn("Attempt to create topic: " + topicName + ". Topic already exists.");
+							}
+						}
+						else {
+							this.logger.error("Failed to create topics", ex.getCause());
+							throw ex.getCause();
+						}
+					}
+					else {
+						this.logger.error("Failed to create topics", ex.getCause());
+						throw ex.getCause();
+					}
+				}
+				return null;
+			});
+		}
+	}
+
+	public Collection<PartitionInfo> getPartitionsForTopic(final int partitionCount,
+														final boolean tolerateLowerPartitionsOnBroker,
+														final Callable<Collection<PartitionInfo>> callable,
+														final String topicName) {
+		try {
+			return this.metadataRetryOperations
+					.execute((context) -> {
+						Collection<PartitionInfo> partitions = Collections.emptyList();
+
+						try {
+							//This call may return null or throw an exception.
+							partitions = callable.call();
+						}
+						catch (Exception ex) {
+							//The above call can potentially throw exceptions such as timeout. If we can determine
+							//that the exception was due to an unknown topic on the broker, just simply rethrow that.
+							if (ex instanceof UnknownTopicOrPartitionException) {
+								throw ex;
+							}
+						}
+						if (CollectionUtils.isEmpty(partitions)) {
+							final AdminClient adminClient = AdminClient.create(this.adminClientProperties);
+							final DescribeTopicsResult describeTopicsResult = adminClient.describeTopics(Collections.singletonList(topicName));
+							try {
+								describeTopicsResult.all().get();
+							}
+							catch (ExecutionException ex) {
+								if (ex.getCause() instanceof UnknownTopicOrPartitionException) {
+									throw (UnknownTopicOrPartitionException)ex.getCause();
+								} else {
+									logger.warn("No partitions have been retrieved for the topic (" + topicName + "). This will affect the health check.");
+								}
+							}
+						}
+						// do a sanity check on the partition set
+						int partitionSize = partitions.size();
+						if (partitionSize < partitionCount) {
+							if (tolerateLowerPartitionsOnBroker) {
+								this.logger.warn("The number of expected partitions was: " + partitionCount + ", but "
+										+ partitionSize + (partitionSize > 1 ? " have " : " has ") + "been found instead."
+										+ "There will be " + (partitionCount - partitionSize) + " idle consumers");
+							}
+							else {
+								throw new IllegalStateException("The number of expected partitions was: "
+										+ partitionCount + ", but " + partitionSize
+										+ (partitionSize > 1 ? " have " : " has ") + "been found instead");
+							}
+						}
+						return partitions;
+					});
+		}
+		catch (Exception ex) {
+			this.logger.error("Cannot initialize Binder", ex);
+			throw new BinderException("Cannot initialize binder:", ex);
+		}
+	}
+
+	private static final class KafkaProducerDestination implements ProducerDestination {
+
+		private final String producerDestinationName;
+
+		private final int partitions;
+
+		KafkaProducerDestination(String destinationName, Integer partitions) {
+			this.producerDestinationName = destinationName;
+			this.partitions = partitions;
+		}
+
+		@Override
+		public String getName() {
+			return this.producerDestinationName;
+		}
+
+		@Override
+		public String getNameForPartition(int partition) {
+			return this.producerDestinationName;
+		}
+
+		@Override
+		public String toString() {
+			return "KafkaProducerDestination{" +
+					"producerDestinationName='" + producerDestinationName + '\'' +
+					", partitions=" + partitions +
+					'}';
+		}
+	}
+
+	private static final class KafkaConsumerDestination implements ConsumerDestination {
+
+		private final String consumerDestinationName;
+
+		private final int partitions;
+
+		private final String dlqName;
+
+		KafkaConsumerDestination(String consumerDestinationName) {
+			this(consumerDestinationName, 0, null);
+		}
+
+		KafkaConsumerDestination(String consumerDestinationName, int partitions) {
+			this(consumerDestinationName, partitions, null);
+		}
+
+		KafkaConsumerDestination(String consumerDestinationName, Integer partitions, String dlqName) {
+			this.consumerDestinationName = consumerDestinationName;
+			this.partitions = partitions;
+			this.dlqName = dlqName;
+		}
+
+		@Override
+		public String getName() {
+			return this.consumerDestinationName;
+		}
+
+		@Override
+		public String toString() {
+			return "KafkaConsumerDestination{" +
+					"consumerDestinationName='" + consumerDestinationName + '\'' +
+					", partitions=" + partitions +
+					", dlqName='" + dlqName + '\'' +
+					'}';
+		}
+	}
+}

spring-cloud-stream-binder-kafka-core/src/main/java/org/springframework/cloud/stream/binder/kafka/utils/KafkaTopicUtils.java

@@ -14,11 +14,13 @@
  * limitations under the License.
  */
 
-package org.springframework.cloud.stream.binder.kafka;
+package org.springframework.cloud.stream.binder.kafka.utils;
 
 import java.io.UnsupportedEncodingException;
 
 /**
+ * Utility methods releated to Kafka topics.
+ *
  * @author Soby Chacko
  */
 public final class KafkaTopicUtils {
@@ -28,7 +30,10 @@ public final class KafkaTopicUtils {
 	}
 
 	/**
+	 * Validate topic name.
 	 * Allowed chars are ASCII alphanumerics, '.', '_' and '-'.
+	 *
+	 * @param topicName name of the topic
 	 */
 	public static void validateTopicName(String topicName) {
 		try {
@@ -37,12 +42,13 @@ public final class KafkaTopicUtils {
 				if (!((b >= 'a') && (b <= 'z') || (b >= 'A') && (b <= 'Z') || (b >= '0') && (b <= '9') || (b == '.')
 						|| (b == '-') || (b == '_'))) {
 					throw new IllegalArgumentException(
-							"Topic name can only have ASCII alphanumerics, '.', '_' and '-'");
+							"Topic name can only have ASCII alphanumerics, '.', '_' and '-', but was: '" + topicName
+									+ "'");
 				}
 			}
 		}
-		catch (UnsupportedEncodingException e) {
-			throw new AssertionError(e); // Can't happen
+		catch (UnsupportedEncodingException ex) {
+			throw new AssertionError(ex); // Can't happen
 		}
 	}
 }

spring-cloud-stream-binder-kafka-core/src/test/java/org/springframework/cloud/stream/binder/kafka/provisioning/KafkaTopicProvisionerTests.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.provisioning;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.clients.admin.AdminClient;
+import org.apache.kafka.clients.admin.AdminClientConfig;
+import org.apache.kafka.common.config.SslConfigs;
+import org.apache.kafka.common.network.SslChannelBuilder;
+import org.junit.Test;
+
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.kafka.test.utils.KafkaTestUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
+
+
+/**
+ * @author Gary Russell
+ * @since 2.0
+ *
+ */
+public class KafkaTopicProvisionerTests {
+
+	@SuppressWarnings("rawtypes")
+	@Test
+	public void bootPropertiesOverriddenExceptServers() throws Exception {
+		KafkaProperties bootConfig = new KafkaProperties();
+		bootConfig.getProperties().put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "PLAINTEXT");
+		bootConfig.setBootstrapServers(Collections.singletonList("localhost:1234"));
+		KafkaBinderConfigurationProperties binderConfig = new KafkaBinderConfigurationProperties(bootConfig);
+		binderConfig.getConfiguration().put(AdminClientConfig.SECURITY_PROTOCOL_CONFIG, "SSL");
+		ClassPathResource ts = new ClassPathResource("test.truststore.ks");
+		binderConfig.getConfiguration().put(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG, ts.getFile().getAbsolutePath());
+		binderConfig.setBrokers("localhost:9092");
+		KafkaTopicProvisioner provisioner = new KafkaTopicProvisioner(binderConfig, bootConfig);
+		AdminClient adminClient = provisioner.createAdminClient();
+		assertThat(KafkaTestUtils.getPropertyValue(adminClient, "client.selector.channelBuilder")).isInstanceOf(SslChannelBuilder.class);
+		Map configs = KafkaTestUtils.getPropertyValue(adminClient, "client.selector.channelBuilder.configs", Map.class);
+		assertThat(((List) configs.get(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG)).get(0)).isEqualTo("localhost:1234");
+		adminClient.close();
+	}
+
+	@SuppressWarnings("rawtypes")
+	@Test
+	public void bootPropertiesOverriddenIncludingServers() throws Exception {
+		KafkaProperties bootConfig = new KafkaProperties();
+		bootConfig.getProperties().put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "PLAINTEXT");
+		bootConfig.setBootstrapServers(Collections.singletonList("localhost:9092"));
+		KafkaBinderConfigurationProperties binderConfig = new KafkaBinderConfigurationProperties(bootConfig);
+		binderConfig.getConfiguration().put(AdminClientConfig.SECURITY_PROTOCOL_CONFIG, "SSL");
+		ClassPathResource ts = new ClassPathResource("test.truststore.ks");
+		binderConfig.getConfiguration().put(SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG, ts.getFile().getAbsolutePath());
+		binderConfig.setBrokers("localhost:1234");
+		KafkaTopicProvisioner provisioner = new KafkaTopicProvisioner(binderConfig, bootConfig);
+		AdminClient adminClient = provisioner.createAdminClient();
+		assertThat(KafkaTestUtils.getPropertyValue(adminClient, "client.selector.channelBuilder")).isInstanceOf(SslChannelBuilder.class);
+		Map configs = KafkaTestUtils.getPropertyValue(adminClient, "client.selector.channelBuilder.configs", Map.class);
+		assertThat(((List) configs.get(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG)).get(0)).isEqualTo("localhost:1234");
+		adminClient.close();
+	}
+
+	@Test
+	public void brokersInvalid() throws Exception {
+		KafkaProperties bootConfig = new KafkaProperties();
+		KafkaBinderConfigurationProperties binderConfig = new KafkaBinderConfigurationProperties(bootConfig);
+		binderConfig.getConfiguration().put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, "localhost:1234");
+		try {
+			new KafkaTopicProvisioner(binderConfig, bootConfig);
+			fail("Expected illegal state");
+		}
+		catch (IllegalStateException e) {
+			assertThat(e.getMessage())
+					.isEqualTo("Set binder bootstrap servers via the 'brokers' property, not 'configuration'");
+		}
+	}
+
+}

spring-cloud-stream-binder-kafka-docs/pom.xml

@@ -1,337 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <parent>
-        <groupId>org.springframework.cloud</groupId>
-        <artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
-        <version>1.1.0.M1</version>
-    </parent>
-
-    <artifactId>spring-cloud-stream-binder-kafka-docs</artifactId>
-    <name>spring-cloud-stream-binder-kafka-docs</name>
-    <description>Spring Cloud Stream Kafka Binder Docs</description>
-    <properties>
-        <main.basedir>${basedir}/..</main.basedir>
-    </properties>
-    <dependencies>
-        <dependency>
-            <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-stream-binder-kafka</artifactId>
-            <version>1.1.0.M1</version>
-        </dependency>
-    </dependencies>
-    <profiles>
-        <profile>
-            <id>full</id>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.codehaus.mojo</groupId>
-                        <artifactId>xml-maven-plugin</artifactId>
-                        <version>1.0</version>
-                        <executions>
-                            <execution>
-                                <goals>
-                                    <goal>transform</goal>
-                                </goals>
-                            </execution>
-                        </executions>
-                        <configuration>
-                            <transformationSets>
-                                <transformationSet>
-                                    <dir>${project.build.directory}/external-resources</dir>
-                                    <stylesheet>src/main/xslt/dependencyVersions.xsl</stylesheet>
-                                    <fileMappers>
-                                        <fileMapper implementation="org.codehaus.plexus.components.io.filemappers.FileExtensionMapper">
-                                            <targetExtension>.adoc</targetExtension>
-                                        </fileMapper>
-                                    </fileMappers>
-                                    <outputDir>${project.build.directory}/generated-resources</outputDir>
-                                </transformationSet>
-                            </transformationSets>
-                        </configuration>
-                    </plugin>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-javadoc-plugin</artifactId>
-                        <executions>
-                            <execution>
-                                <id>attach-javadocs</id>
-                                <goals>
-                                    <goal>jar</goal>
-                                </goals>
-                                <phase>prepare-package</phase>
-                                <configuration>
-                                    <includeDependencySources>true</includeDependencySources>
-                                    <dependencySourceIncludes>
-                                        <dependencySourceInclude>${project.groupId}:*</dependencySourceInclude>
-                                    </dependencySourceIncludes>
-                                    <attach>false</attach>
-                                    <quiet>true</quiet>
-                                    <stylesheetfile>${basedir}/src/main/javadoc/spring-javadoc.css</stylesheetfile>
-                                    <links>
-                                        <link>http://docs.spring.io/spring-framework/docs/${spring.version}/javadoc-api/</link>
-                                        <link>http://docs.spring.io/spring-shell/docs/current/api/</link>
-                                    </links>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                    <plugin>
-                        <groupId>org.asciidoctor</groupId>
-                        <artifactId>asciidoctor-maven-plugin</artifactId>
-                        <version>1.5.0</version>
-                        <executions>
-                            <execution>
-                                <id>generate-docbook</id>
-                                <phase>generate-resources</phase>
-                                <goals>
-                                    <goal>process-asciidoc</goal>
-                                </goals>
-                                <configuration>
-                                    <sourceDocumentName>index.adoc</sourceDocumentName>
-                                    <backend>docbook5</backend>
-                                    <doctype>book</doctype>
-                                    <attributes>
-                                        <docinfo>true</docinfo>
-                                        <spring-cloud-stream-binder-kafka-version>${project.version}</spring-cloud-stream-binder-kafka-version>
-                                        <spring-cloud-stream-binder-kafka-docs-version>${project.version}</spring-cloud-stream-binder-kafka-docs-version>
-                                        <github-tag>${github-tag}</github-tag>
-                                    </attributes>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                    <plugin>
-                        <groupId>com.agilejava.docbkx</groupId>
-                        <artifactId>docbkx-maven-plugin</artifactId>
-                        <version>2.0.15</version>
-                        <configuration>
-                            <sourceDirectory>${basedir}/target/generated-docs</sourceDirectory>
-                            <includes>index.xml</includes>
-                            <xincludeSupported>true</xincludeSupported>
-                            <chunkedOutput>false</chunkedOutput>
-                            <foCustomization>${basedir}/src/main/docbook/xsl/pdf.xsl</foCustomization>
-                            <useExtensions>1</useExtensions>
-                            <highlightSource>1</highlightSource>
-                            <highlightXslthlConfig>${basedir}/src/main/docbook/xsl/xslthl-config.xml</highlightXslthlConfig>
-                        </configuration>
-                        <dependencies>
-                            <dependency>
-                                <groupId>net.sf.xslthl</groupId>
-                                <artifactId>xslthl</artifactId>
-                                <version>2.1.0</version>
-                            </dependency>
-                            <dependency>
-                                <groupId>net.sf.docbook</groupId>
-                                <artifactId>docbook-xml</artifactId>
-                                <version>5.0-all</version>
-                                <classifier>resources</classifier>
-                                <type>zip</type>
-                                <scope>runtime</scope>
-                            </dependency>
-                        </dependencies>
-                        <executions>
-                            <execution>
-                                <id>html-single</id>
-                                <goals>
-                                    <goal>generate-html</goal>
-                                </goals>
-                                <phase>generate-resources</phase>
-                                <configuration>
-                                    <htmlCustomization>${basedir}/src/main/docbook/xsl/html-singlepage.xsl</htmlCustomization>
-                                    <targetDirectory>${basedir}/target/docbook/htmlsingle</targetDirectory>
-                                    <postProcess>
-                                        <copy todir="${basedir}/target/contents/reference/htmlsingle">
-                                            <fileset dir="${basedir}/target/docbook/htmlsingle">
-                                                <include name="**/*.html" />
-                                            </fileset>
-                                        </copy>
-                                        <copy todir="${basedir}/target/contents/reference/htmlsingle">
-                                            <fileset dir="${basedir}/src/main/docbook">
-                                                <include name="**/*.css" />
-                                                <include name="**/*.png" />
-                                                <include name="**/*.gif" />
-                                                <include name="**/*.jpg" />
-                                            </fileset>
-                                        </copy>
-                                        <copy todir="${basedir}/target/contents/reference/htmlsingle">
-                                            <fileset dir="${basedir}/src/main/asciidoc">
-                                                <include name="images/*.css" />
-                                                <include name="images/*.png" />
-                                                <include name="images/*.gif" />
-                                                <include name="images/*.jpg" />
-                                            </fileset>
-                                        </copy>
-                                    </postProcess>
-                                </configuration>
-                            </execution>
-                            <execution>
-                                <id>html</id>
-                                <goals>
-                                    <goal>generate-html</goal>
-                                </goals>
-                                <phase>generate-resources</phase>
-                                <configuration>
-                                    <htmlCustomization>${basedir}/src/main/docbook/xsl/html-multipage.xsl</htmlCustomization>
-                                    <targetDirectory>${basedir}/target/docbook/html</targetDirectory>
-                                    <chunkedOutput>true</chunkedOutput>
-                                    <postProcess>
-                                        <copy todir="${basedir}/target/contents/reference/html">
-                                            <fileset dir="${basedir}/target/docbook/html">
-                                                <include name="**/*.html" />
-                                            </fileset>
-                                        </copy>
-                                        <copy todir="${basedir}/target/contents/reference/html">
-                                            <fileset dir="${basedir}/src/main/docbook">
-                                                <include name="**/*.css" />
-                                                <include name="**/*.png" />
-                                                <include name="**/*.gif" />
-                                                <include name="**/*.jpg" />
-                                            </fileset>
-                                        </copy>
-                                        <copy todir="${basedir}/target/contents/reference/html">
-                                            <fileset dir="${basedir}/src/main/asciidoc">
-                                                <include name="images/*.css" />
-                                                <include name="images/*.png" />
-                                                <include name="images/*.gif" />
-                                                <include name="images/*.jpg" />
-                                            </fileset>
-                                        </copy>
-                                    </postProcess>
-                                </configuration>
-                            </execution>
-                            <execution>
-                                <id>pdf</id>
-                                <goals>
-                                    <goal>generate-pdf</goal>
-                                </goals>
-                                <phase>generate-resources</phase>
-                                <configuration>
-                                    <foCustomization>${basedir}/src/main/docbook/xsl/pdf.xsl</foCustomization>
-                                    <targetDirectory>${basedir}/target/docbook/pdf</targetDirectory>
-                                    <postProcess>
-                                        <copy todir="${basedir}/target/contents/reference">
-                                            <fileset dir="${basedir}/target/docbook">
-                                                <include name="**/*.pdf" />
-                                            </fileset>
-                                        </copy>
-                                        <move file="${basedir}/target/contents/reference/pdf/index.pdf" tofile="${basedir}/target/contents/reference/pdf/spring-cloud-stream-reference.pdf" />
-                                    </postProcess>
-                                </configuration>
-                            </execution>
-                            <execution>
-                                <id>epub</id>
-                                <goals>
-                                    <goal>generate-epub3</goal>
-                                </goals>
-                                <phase>generate-resources</phase>
-                                <configuration>
-                                    <epubCustomization>${basedir}/src/main/docbook/xsl/epub.xsl</epubCustomization>
-                                    <targetDirectory>${basedir}/target/docbook/epub</targetDirectory>
-                                    <postProcess>
-                                        <copy todir="${basedir}/target/contents/reference/epub">
-                                            <fileset dir="${basedir}/target/docbook">
-                                                <include name="**/*.epub" />
-                                            </fileset>
-                                        </copy>
-                                        <move file="${basedir}/target/contents/reference/epub/index.epub" tofile="${basedir}/target/contents/reference/epub/spring-cloud-stream-reference.epub" />
-                                    </postProcess>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-antrun-plugin</artifactId>
-                        <dependencies>
-                            <dependency>
-                                <groupId>ant-contrib</groupId>
-                                <artifactId>ant-contrib</artifactId>
-                                <version>1.0b3</version>
-                                <exclusions>
-                                    <exclusion>
-                                        <groupId>ant</groupId>
-                                        <artifactId>ant</artifactId>
-                                    </exclusion>
-                                </exclusions>
-                            </dependency>
-                            <dependency>
-                                <groupId>org.apache.ant</groupId>
-                                <artifactId>ant-nodeps</artifactId>
-                                <version>1.8.1</version>
-                            </dependency>
-                            <dependency>
-                                <groupId>org.tigris.antelope</groupId>
-                                <artifactId>antelopetasks</artifactId>
-                                <version>3.2.10</version>
-                            </dependency>
-                        </dependencies>
-                        <executions>
-                            <execution>
-                                <id>package-and-attach-docs-zip</id>
-                                <phase>package</phase>
-                                <goals>
-                                    <goal>run</goal>
-                                </goals>
-                                <configuration>
-                                    <target>
-                                        <zip destfile="${project.build.directory}/${project.artifactId}-${project.version}.zip">
-                                            <zipfileset src="${project.build.directory}/${project.artifactId}-${project.version}-javadoc.jar" prefix="api" />
-                                            <fileset dir="${project.build.directory}/contents" />
-                                        </zip>
-                                    </target>
-                                </configuration>
-                            </execution>
-                            <execution>
-                                <id>setup-maven-properties</id>
-                                <phase>validate</phase>
-                                <goals>
-                                    <goal>run</goal>
-                                </goals>
-                                <configuration>
-                                    <exportAntProperties>true</exportAntProperties>
-                                    <target>
-                                        <taskdef resource="net/sf/antcontrib/antcontrib.properties" />
-                                        <taskdef name="stringutil" classname="ise.antelope.tasks.StringUtilTask" />
-                                        <var name="version-type" value="${project.version}" />
-                                        <propertyregex property="version-type" override="true" input="${version-type}" regexp=".*\.(.*)" replace="\1" />
-                                        <propertyregex property="version-type" override="true" input="${version-type}" regexp="(M)\d+" replace="MILESTONE" />
-                                        <propertyregex property="version-type" override="true" input="${version-type}" regexp="(RC)\d+" replace="MILESTONE" />
-                                        <propertyregex property="version-type" override="true" input="${version-type}" regexp="BUILD-(.*)" replace="SNAPSHOT" />
-                                        <stringutil string="${version-type}" property="spring-boot-repo">
-                                            <lowercase />
-                                        </stringutil>
-                                        <var name="github-tag" value="v${project.version}" />
-                                        <propertyregex property="github-tag" override="true" input="${github-tag}" regexp=".*SNAPSHOT" replace="master" />
-                                    </target>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                    <plugin>
-                        <groupId>org.codehaus.mojo</groupId>
-                        <artifactId>build-helper-maven-plugin</artifactId>
-                        <executions>
-                            <execution>
-                                <id>attach-zip</id>
-                                <goals>
-                                    <goal>attach-artifact</goal>
-                                </goals>
-                                <configuration>
-                                    <artifacts>
-                                        <artifact>
-                                            <file>${project.build.directory}/${project.artifactId}-${project.version}.zip</file>
-                                            <type>zip;zip.type=docs;zip.deployed=false</type>
-                                        </artifact>
-                                    </artifacts>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
-    </profiles>
-</project>

spring-cloud-stream-binder-kafka-docs/src/main/asciidoc/overview.adoc

@@ -1,229 +0,0 @@
-[partintro]
---
-This guide describes the Apache Kafka implementation of the Spring Cloud Stream Binder.
-It contains information about its design, usage and configuration options, as well as information on how the Stream Cloud Stream concepts map into Apache Kafka specific constructs.
---
-
-== Usage
-
-For using the Apache Kafka binder, you just need to add it to your Spring Cloud Stream application, using the following Maven coordinates:
-
-[source,xml]
-----
-<dependency>
-  <groupId>org.springframework.cloud</groupId>
-  <artifactId>spring-cloud-stream-binder-kafka</artifactId>
-</dependency>
-----
-
-Alternatively, you can also use the Spring Cloud Stream Kafka Starter.
-
-[source,xml]
-----
-<dependency>
-  <groupId>org.springframework.cloud</groupId>
-  <artifactId>spring-cloud-starter-stream-kafka</artifactId>
-</dependency>
-----
-
-== Apache Kafka Binder Overview
-
-A simplified diagram of how the Apache Kafka binder operates can be seen below.
-
-.Kafka Binder
-image::kafka-binder.png[width=300,scaledwidth="50%"]
-
-The Apache Kafka Binder implementation maps each destination to an Apache Kafka topic.
-The consumer group maps directly to the same Apache Kafka concept.
-Partitioning also maps directly to Apache Kafka partitions as well.
-
-== Configuration Options
-
-This section contains the configuration options used by the Apache Kafka binder.
-
-For common configuration options and properties pertaining to binder, refer to the https://github.com/spring-cloud/spring-cloud-stream/blob/master/spring-cloud-stream-docs/src/main/asciidoc/spring-cloud-stream-overview.adoc#configuration-options[core docs].
-
-=== Kafka Binder Properties
-
-spring.cloud.stream.kafka.binder.brokers::
-  A list of brokers to which the Kafka binder will connect.
-+
-Default: `localhost`.
-spring.cloud.stream.kafka.binder.defaultBrokerPort::
-  `brokers` allows hosts specified with or without port information (e.g., `host1,host2:port2`).
-This sets the default port when no port is configured in the broker list.
-+
-Default: `9092`.
-spring.cloud.stream.kafka.binder.zkNodes::
-  A list of ZooKeeper nodes to which the Kafka binder can connect.
-+
-Default: `localhost`.
-spring.cloud.stream.kafka.binder.defaultZkPort::
-  `zkNodes` allows hosts specified with or without port information (e.g., `host1,host2:port2`).
-This sets the default port when no port is configured in the node list.
-+
-Default: `2181`.
-spring.cloud.stream.kafka.binder.configuration::
-  Key/Value map of client properties (both producers and consumer) passed to all clients created by the binder.
-Due to the fact that these properties will be used by both producers and consumers, usage should be restricted to common properties, especially security settings.
-+
-Default: Empty map.
-spring.cloud.stream.kafka.binder.headers::
-  The list of custom headers that will be transported by the binder.
-+
-Default: empty.
-spring.cloud.stream.kafka.binder.offsetUpdateTimeWindow::
-  The frequency, in milliseconds, with which offsets are saved.
-Ignored if `0`.
-+
-Default: `10000`.
-spring.cloud.stream.kafka.binder.offsetUpdateCount::
-  The frequency, in number of updates, which which consumed offsets are persisted.
-Ignored if `0`.
-Mutually exclusive with `offsetUpdateTimeWindow`.
-+
-Default: `0`.
-spring.cloud.stream.kafka.binder.requiredAcks::
-  The number of required acks on the broker.
-+
-Default: `1`.
-spring.cloud.stream.kafka.binder.minPartitionCount::
-  Effective only if `autoCreateTopics` or `autoAddPartitions` is set.
-The global minimum number of partitions that the binder will configure on topics on which it produces/consumes data.
-It can be superseded by the `partitionCount` setting of the producer or by the value of `instanceCount` * `concurrency` settings of the producer (if either is larger).
-+
-Default: `1`.
-spring.cloud.stream.kafka.binder.replicationFactor::
-  The replication factor of auto-created topics if `autoCreateTopics` is active.
-+
-Default: `1`.
-spring.cloud.stream.kafka.binder.autoCreateTopics::
-  If set to `true`, the binder will create new topics automatically.
-If set to `false`, the binder will rely on the topics being already configured.
-In the latter case, if the topics do not exist, the binder will fail to start.
-Of note, this setting is independent of the `auto.topic.create.enable` setting of the broker and it does not influence it: if the server is set to auto-create topics, they may be created as part of the metadata retrieval request, with default broker settings.
-+
-Default: `true`.
-spring.cloud.stream.kafka.binder.autoAddPartitions::
-  If set to `true`, the binder will create add new partitions if required.
-If set to `false`, the binder will rely on the partition size of the topic being already configured.
-If the partition count of the target topic is smaller than the expected value, the binder will fail to start.
-+
-Default: `false`.
-spring.cloud.stream.kafka.binder.socketBufferSize::
-  Size (in bytes) of the socket buffer to be used by the Kafka consumers.
-+
-Default: `2097152`.
-
-=== Kafka Consumer Properties
-
-The following properties are available for Kafka consumers only and
-must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.consumer.`.
-
-autoCommitOffset::
-  Whether to autocommit offsets when a message has been processed.
-If set to `false`, an `Acknowledgment` header will be available in the message headers for late acknowledgment.
-+
-Default: `true`.
-autoCommitOnError::
-  Effective only if `autoCommitOffset` is set to `true`.
-If set to `false` it suppresses auto-commits for messages that result in errors, and will commit only for successful messages, allows a stream to automatically replay from the last successfully processed message, in case of persistent failures.
-If set to `true`, it will always auto-commit (if auto-commit is enabled).
-If not set (default), it effectively has the same value as `enableDlq`, auto-committing erroneous messages if they are sent to a DLQ, and not committing them otherwise.
-+
-Default: not set.
-recoveryInterval::
-  The interval between connection recovery attempts, in milliseconds.
-+
-Default: `5000`.
-resetOffsets::
-  Whether to reset offsets on the consumer to the value provided by `startOffset`.
-+
-Default: `false`.
-startOffset::
-  The starting offset for new groups, or when `resetOffsets` is `true`.
-Allowed values: `earliest`, `latest`.
-+
-Default: null (equivalent to `earliest`).
-enableDlq::
-  When set to true, it will send enable DLQ behavior for the consumer.
-  Messages that result in errors will be forwarded to a topic named `error.<destination>.<group>`.
-  This provides an alternative option to the more common Kafka replay scenario for the case when the number of errors is relatively small and replaying the entire original topic may be too cumbersome.
-+
-Default: `false`.
-configuration::
-  Map with a key/value pair containing generic Kafka consumer properties.
-+
-Default: Empty map.
-
-=== Kafka Producer Properties
-
-The following properties are available for Kafka producers only and
-must be prefixed with `spring.cloud.stream.kafka.bindings.<channelName>.producer.`.
-
-bufferSize::
-  Upper limit, in bytes, of how much data the Kafka producer will attempt to batch before sending.
-+
-Default: `16384`.
-sync::
-  Whether the producer is synchronous.
-+
-Default: `false`.
-batchTimeout::
-  How long the producer will wait before sending in order to allow more messages to accumulate in the same batch.
-(Normally the producer does not wait at all, and simply sends all the messages that accumulated while the previous send was in progress.) A non-zero value may increase throughput at the expense of latency.
-+
-Default: `0`.
-configuration::
-  Map with a key/value pair containing generic Kafka producer properties.
-+
-Default: Empty map.
-
-[NOTE]
-====
-The Kafka binder will use the `partitionCount` setting of the producer as a hint to create a topic with the given partition count (in conjunction with the `minPartitionCount`, the maximum of the two being the value being used).
-Exercise caution when configuring both `minPartitionCount` for a binder and `partitionCount` for an application, as the larger value will be used.
-If a topic already exists with a smaller partition count and `autoAddPartitions` is disabled (the default), then the binder will fail to start.
-If a topic already exists with a smaller partition count and `autoAddPartitions` is enabled, new partitions will be added.
-If a topic already exists with a larger number of partitions than the maximum of (`minPartitionCount` and `partitionCount`), the existing partition count will be used.
-====
-
-=== Usage examples
-
-In this section, we illustrate the use of the above properties for specific scenarios.
-
-==== Example: security configuration
-
-Apache Kafka 0.9 supports secure connections between client and brokers.
-To take advantage of this feature, follow the guidelines in the http://kafka.apache.org/090/documentation.html#security_configclients[Apache Kafka Documentation] as well as the Kafka 0.9 http://docs.confluent.io/2.0.0/kafka/security.html[security guidelines from the Confluent documentation].
-Use the `spring.cloud.stream.kafka.binder.configuration` option to set security properties for all clients created by the binder.
-
-For example, for setting `security.protocol` to `SASL_SSL`, set:
-
-[source]
-----
-spring.cloud.stream.kafka.binder.configuration.security.protocol=SASL_SSL
-----
-
-All the other security properties can be set in a similar manner.
-
-When using Kerberos, follow the instructions in the http://kafka.apache.org/090/documentation.html#security_sasl_clientconfig[reference documentation] for creating and referencing the JAAS configuration.
-At the time of this release, the JAAS, and (optionally) krb5 file locations must be set for Spring Cloud Stream applications by using system properties.
-Here is an example of launching a Spring Cloud Stream application with SASL and Kerberos.
-
-[source]
-----
- java -Djava.security.auth.login.config=/path.to/kafka_client_jaas.conf -jar log.jar \\
-   --spring.cloud.stream.kafka.binder.brokers=secure.server:9092 \\
-   --spring.cloud.stream.kafka.binder.zkNodes=secure.zookeeper:2181 \\
-   --spring.cloud.stream.bindings.input.destination=stream.ticktock \\
-   --spring.cloud.stream.kafka.binder.clientConfiguration.security.protocol=SASL_PLAINTEXT
-----
-
-
-[NOTE]
-====
-Exercise caution when using the `autoCreateTopics` and `autoAddPartitions` if using Kerberos.
-Usually applications may use principals that do not have administrative rights in Kafka and Zookeeper, and relying on Spring Cloud Stream to create/modify topics may fail.
-In secure environments, we strongly recommend creating topics and managing ACLs administratively using Kafka tooling.
-====

spring-cloud-stream-binder-kafka-docs/src/main/docbook/css/highlight.css

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-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-		xmlns:xslthl="http://xslthl.sf.net"
-		xmlns:d="http://docbook.org/ns/docbook"
-		exclude-result-prefixes="xslthl d"
-		version='1.0'>
-
-	<xsl:import href="urn:docbkx:stylesheet"/>
-	<xsl:import href="common.xsl"/>
-
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/html-multipage.xsl

@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!--
-Licensed to the Apache Software Foundation (ASF) under one
-or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information
-regarding copyright ownership.  The ASF licenses this file
-to you under the Apache License, Version 2.0 (the
-"License"); you may not use this file except in compliance
-with the License.  You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing,
-software distributed under the License is distributed on an
-"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, either express or implied.  See the License for the
-specific language governing permissions and limitations
-under the License.
--->
-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-				version='1.0'>
-
-	<xsl:import href="urn:docbkx:stylesheet"/>
-	<xsl:import href="html.xsl"/>
-
-	<xsl:param name="html.stylesheet">css/manual-multipage.css</xsl:param>
-
-	<xsl:param name="chunk.section.depth">'5'</xsl:param>
-	<xsl:param name="use.id.as.filename">'1'</xsl:param>
-
-	<!-- Replace chunk-element-content from chunk-common to add firstpage class to body -->
-	<xsl:template name="chunk-element-content">
-		<xsl:param name="prev"/>
-		<xsl:param name="next"/>
-		<xsl:param name="nav.context"/>
-		<xsl:param name="content">
-			<xsl:apply-imports/>
-		</xsl:param>
-
-  		<xsl:call-template name="user.preroot"/>
-
-		<html>
-			<xsl:call-template name="html.head">
-			<xsl:with-param name="prev" select="$prev"/>
-			<xsl:with-param name="next" select="$next"/>
-			</xsl:call-template>
-			<body>
-				<xsl:if test="count($prev) = 0">
-					<xsl:attribute name="class">firstpage</xsl:attribute>
-				</xsl:if>
-				<xsl:call-template name="body.attributes"/>
-				<xsl:call-template name="user.header.navigation"/>
-				<xsl:call-template name="header.navigation">
-					<xsl:with-param name="prev" select="$prev"/>
-					<xsl:with-param name="next" select="$next"/>
-					<xsl:with-param name="nav.context" select="$nav.context"/>
-				</xsl:call-template>
-				<xsl:call-template name="user.header.content"/>
-				<xsl:copy-of select="$content"/>
-				<xsl:call-template name="user.footer.content"/>
-				<xsl:call-template name="footer.navigation">
-					<xsl:with-param name="prev" select="$prev"/>
-					<xsl:with-param name="next" select="$next"/>
-					<xsl:with-param name="nav.context" select="$nav.context"/>
-				</xsl:call-template>
-				<xsl:call-template name="user.footer.navigation"/>
-			</body>
-		</html>
-		<xsl:value-of select="$chunk.append"/>
-	</xsl:template>
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/html-singlepage.xsl

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!--
-Licensed to the Apache Software Foundation (ASF) under one
-or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information
-regarding copyright ownership.  The ASF licenses this file
-to you under the Apache License, Version 2.0 (the
-"License"); you may not use this file except in compliance
-with the License.  You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing,
-software distributed under the License is distributed on an
-"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, either express or implied.  See the License for the
-specific language governing permissions and limitations
-under the License.
--->
-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-				version='1.0'>
-
-	<xsl:import href="urn:docbkx:stylesheet"/>
-	<xsl:import href="html.xsl"/>
-
-	<xsl:param name="html.stylesheet">css/manual-singlepage.css</xsl:param>
-
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/html.xsl

@@ -1,141 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!--
-Licensed to the Apache Software Foundation (ASF) under one
-or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information
-regarding copyright ownership.  The ASF licenses this file
-to you under the Apache License, Version 2.0 (the
-"License"); you may not use this file except in compliance
-with the License.  You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing,
-software distributed under the License is distributed on an
-"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, either express or implied.  See the License for the
-specific language governing permissions and limitations
-under the License.
--->
-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-		xmlns:xslthl="http://xslthl.sf.net"
-		xmlns:d="http://docbook.org/ns/docbook"
-		exclude-result-prefixes="xslthl"
-		version='1.0'>
-
-	<xsl:import href="urn:docbkx:stylesheet/highlight.xsl"/>
-	<xsl:import href="common.xsl"/>
-
-	<!-- Only use scaling in FO -->
-	<xsl:param name="ignore.image.scaling">1</xsl:param>
-
-	<!-- Use code syntax highlighting -->
-	<xsl:param name="highlight.source">1</xsl:param>
-
-	<!-- Activate Graphics -->
-	<xsl:param name="callout.graphics" select="1" />
-	<xsl:param name="callout.defaultcolumn">120</xsl:param>
-	<xsl:param name="callout.graphics.path">images/callouts/</xsl:param>
-	<xsl:param name="callout.graphics.extension">.png</xsl:param>
-
-	<xsl:param name="table.borders.with.css" select="1"/>
-	<xsl:param name="html.stylesheet.type">text/css</xsl:param>
-
-	<xsl:param name="admonition.title.properties">text-align: left</xsl:param>
-
-	<!-- Leave image paths as relative when navigating XInclude -->
-	<xsl:param name="keep.relative.image.uris" select="1"/>
-
-	<!-- Label Chapters and Sections (numbering) -->
-	<xsl:param name="chapter.autolabel" select="1"/>
-	<xsl:param name="section.autolabel" select="1"/>
-	<xsl:param name="section.autolabel.max.depth" select="2"/>
-	<xsl:param name="section.label.includes.component.label" select="1"/>
-	<xsl:param name="table.footnote.number.format" select="'1'"/>
-
-	<!-- Remove "Chapter" from the Chapter titles... -->
-	<xsl:param name="local.l10n.xml" select="document('')"/>
-	<l:i18n xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">
-		<l:l10n language="en">
-			<l:context name="title-numbered">
-				<l:template name="chapter" text="%n.&#160;%t"/>
-				<l:template name="section" text="%n&#160;%t"/>
-			</l:context>
-		</l:l10n>
-	</l:i18n>
-
-	<!-- Syntax Highlighting -->
-	<xsl:template match='xslthl:keyword' mode="xslthl">
-		<span class="hl-keyword"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:comment' mode="xslthl">
-		<span class="hl-comment"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:oneline-comment' mode="xslthl">
-		<span class="hl-comment"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:multiline-comment' mode="xslthl">
-		<span class="hl-multiline-comment"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:tag' mode="xslthl">
-		<span class="hl-tag"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:attribute' mode="xslthl">
-		<span class="hl-attribute"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:value' mode="xslthl">
-		<span class="hl-value"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<xsl:template match='xslthl:string' mode="xslthl">
-		<span class="hl-string"><xsl:apply-templates mode="xslthl"/></span>
-	</xsl:template>
-
-	<!-- Custom Title Page -->
-	<xsl:template match="d:author" mode="titlepage.mode">
-		<xsl:if test="name(preceding-sibling::*[1]) = 'author'">
-			<xsl:text>, </xsl:text>
-		</xsl:if>
-		<span class="{name(.)}">
-			<xsl:call-template name="person.name"/>
-			<xsl:apply-templates mode="titlepage.mode" select="./contrib"/>
-		</span>
-	</xsl:template>
-	<xsl:template match="d:authorgroup" mode="titlepage.mode">
-		<div class="{name(.)}">
-			<h2>Authors</h2>
-			<xsl:apply-templates mode="titlepage.mode"/>
-		</div>
-	</xsl:template>
-
-	<!-- Title Links -->
-	<xsl:template name="anchor">
-		<xsl:param name="node" select="."/>
-		<xsl:param name="conditional" select="1"/>
-		<xsl:variable name="id">
-			<xsl:call-template name="object.id">
-				<xsl:with-param name="object" select="$node"/>
-			</xsl:call-template>
-		</xsl:variable>
-		<xsl:if test="$conditional = 0 or $node/@id or $node/@xml:id">
-			<xsl:element name="a">
-				<xsl:attribute name="name">
-					<xsl:value-of select="$id"/>
-				</xsl:attribute>
-				<xsl:attribute name="href">
-					<xsl:text>#</xsl:text>
-					<xsl:value-of select="$id"/>
-				</xsl:attribute>
-			</xsl:element>
-		</xsl:if>
-	</xsl:template>
-
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/pdf.xsl

@@ -1,582 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!--
-Licensed to the Apache Software Foundation (ASF) under one
-or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information
-regarding copyright ownership.  The ASF licenses this file
-to you under the Apache License, Version 2.0 (the
-"License"); you may not use this file except in compliance
-with the License.  You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing,
-software distributed under the License is distributed on an
-"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, either express or implied.  See the License for the
-specific language governing permissions and limitations
-under the License.
--->
-
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-				xmlns:d="http://docbook.org/ns/docbook"
-				xmlns:fo="http://www.w3.org/1999/XSL/Format"
-				xmlns:xslthl="http://xslthl.sf.net"
-				xmlns:xlink='http://www.w3.org/1999/xlink'
-				xmlns:exsl="http://exslt.org/common"
-				exclude-result-prefixes="exsl xslthl d xlink"
-				version='1.0'>
-
-	<xsl:import href="urn:docbkx:stylesheet"/>
-	<xsl:import href="urn:docbkx:stylesheet/highlight.xsl"/>
-	<xsl:import href="common.xsl"/>
-
-	<!-- Extensions -->
-	<xsl:param name="fop1.extensions" select="1"/>
-
-	<xsl:param name="paper.type" select="'A4'"/>
-	<xsl:param name="page.margin.top" select="'1cm'"/>
-	<xsl:param name="region.before.extent" select="'1cm'"/>
-	<xsl:param name="body.margin.top" select="'1.5cm'"/>
-
-	<xsl:param name="body.margin.bottom" select="'1.5cm'"/>
-	<xsl:param name="region.after.extent" select="'1cm'"/>
-	<xsl:param name="page.margin.bottom" select="'1cm'"/>
-	<xsl:param name="title.margin.left" select="'0cm'"/>
-
-	<!-- allow break across pages -->
-	<xsl:attribute-set name="formal.object.properties">
-		<xsl:attribute name="keep-together.within-column">auto</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- use color links and sensible rendering -->
-	<xsl:attribute-set name="xref.properties">
-		<xsl:attribute name="text-decoration">underline</xsl:attribute>
-		<xsl:attribute name="color">#204060</xsl:attribute>
-	</xsl:attribute-set>
-	<xsl:param name="ulink.show" select="0"></xsl:param>
-	<xsl:param name="ulink.footnotes" select="0"></xsl:param>
-
-	<!-- TITLE PAGE -->
-
-	<xsl:template name="book.titlepage.recto">
-		<fo:block>
-			<fo:table table-layout="fixed" width="175mm">
-				<fo:table-column column-width="175mm"/>
-				<fo:table-body>
-					<fo:table-row>
-						<fo:table-cell text-align="center">
-							<fo:block>
-								<fo:external-graphic src="images/logo.png" width="240px"
-									height="auto" content-width="scale-to-fit"
-									content-height="scale-to-fit"
-									content-type="content-type:image/png" text-align="center"
-								/>
-							</fo:block>
-							<fo:block font-family="Helvetica" font-size="20pt" font-weight="bold" padding="10mm">
-								<xsl:value-of select="d:info/d:title"/>
-							</fo:block>
-							<fo:block font-family="Helvetica" font-size="14pt" padding-before="2mm">
-								<xsl:value-of select="d:info/d:subtitle"/>
-							</fo:block>
-							<fo:block font-family="Helvetica" font-size="14pt" padding="2mm">
-								<xsl:value-of select="d:info/d:releaseinfo"/>
-							</fo:block>
-						</fo:table-cell>
-					</fo:table-row>
-					<fo:table-row>
-						<fo:table-cell text-align="center">
-							<fo:block font-family="Helvetica" font-size="14pt" padding="5mm">
-								<xsl:value-of select="d:info/d:pubdate"/>
-							</fo:block>
-						</fo:table-cell>
-					</fo:table-row>
-					<fo:table-row>
-						<fo:table-cell text-align="center">
-							<fo:block font-family="Helvetica" font-size="10pt" padding="10mm">
-								<xsl:for-each select="d:info/d:authorgroup/d:author">
-									<xsl:if test="position() > 1">
-										<xsl:text>, </xsl:text>
-									</xsl:if>
-									<xsl:value-of select="."/>
-								</xsl:for-each>
-							</fo:block>
-
-							<fo:block font-family="Helvetica" font-size="10pt" padding="5mm">
-								<xsl:value-of select="d:info/d:pubdate"/>
-							</fo:block>
-
-							<fo:block font-family="Helvetica" font-size="10pt" padding="5mm" padding-before="25em">
-								<xsl:text>Copyright &#xA9; </xsl:text><xsl:value-of select="d:info/d:copyright"/>
-							</fo:block>
-
-							<fo:block font-family="Helvetica" font-size="8pt" padding="1mm">
-								<xsl:value-of select="d:info/d:legalnotice"/>
-							</fo:block>
-						</fo:table-cell>
-					</fo:table-row>
-				</fo:table-body>
-			</fo:table>
-		</fo:block>
-	</xsl:template>
-
-	<!-- Prevent blank pages in output -->
-	<xsl:template name="book.titlepage.before.verso">
-	</xsl:template>
-	<xsl:template name="book.titlepage.verso">
-	</xsl:template>
-	<xsl:template name="book.titlepage.separator">
-	</xsl:template>
-
-	<!--  HEADER -->
-
-	<!-- More space in the center header for long text -->
-	<xsl:attribute-set name="header.content.properties">
-		<xsl:attribute name="font-family">
-			<xsl:value-of select="$body.font.family"/>
-		</xsl:attribute>
-		<xsl:attribute name="margin-left">-5em</xsl:attribute>
-		<xsl:attribute name="margin-right">-5em</xsl:attribute>
-		<xsl:attribute name="font-size">8pt</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:template name="header.content">
-		<xsl:param name="pageclass" select="''"/>
-		<xsl:param name="sequence" select="''"/>
-		<xsl:param name="position" select="''"/>
-		<xsl:param name="gentext-key" select="''"/>
-
-		<xsl:variable name="Version">
-			<xsl:choose>
-				<xsl:when test="//d:title">
-					<xsl:value-of select="//d:title"/><xsl:text> </xsl:text>
-				</xsl:when>
-				<xsl:otherwise>
-					<xsl:text>please define title in your docbook file!</xsl:text>
-				</xsl:otherwise>
-			</xsl:choose>
-		</xsl:variable>
-
-		<xsl:choose>
-			<xsl:when test="$sequence='blank'">
-				<xsl:choose>
-					<xsl:when test="$position='center'">
-						<xsl:value-of select="$Version"/>
-					</xsl:when>
-
-					<xsl:otherwise>
-					</xsl:otherwise>
-				</xsl:choose>
-			</xsl:when>
-
-			<xsl:when test="$pageclass='titlepage'">
-			</xsl:when>
-
-			<xsl:when test="$position='center'">
-				<xsl:value-of select="$Version"/>
-			</xsl:when>
-
-			<xsl:otherwise>
-			</xsl:otherwise>
-		</xsl:choose>
-	</xsl:template>
-
-	<!-- FOOTER-->
-	<xsl:attribute-set name="footer.content.properties">
-		<xsl:attribute name="font-family">
-			<xsl:value-of select="$body.font.family"/>
-		</xsl:attribute>
-		<xsl:attribute name="font-size">8pt</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:template name="footer.content">
-		<xsl:param name="pageclass" select="''"/>
-		<xsl:param name="sequence" select="''"/>
-		<xsl:param name="position" select="''"/>
-		<xsl:param name="gentext-key" select="''"/>
-
-		<xsl:variable name="Version">
-			<xsl:choose>
-				<xsl:when test="//d:releaseinfo">
-					<xsl:value-of select="//d:releaseinfo"/>
-				</xsl:when>
-				<xsl:otherwise>
-				</xsl:otherwise>
-			</xsl:choose>
-		</xsl:variable>
-
-		<xsl:variable name="Title">
-			<xsl:choose>
-				<xsl:when test="//d:productname">
-					<xsl:value-of select="//d:productname"/><xsl:text> </xsl:text>
-				</xsl:when>
-				<xsl:otherwise>
-					<xsl:text>please define title in your docbook file!</xsl:text>
-				</xsl:otherwise>
-			</xsl:choose>
-		</xsl:variable>
-
-		<xsl:choose>
-			<xsl:when test="$sequence='blank'">
-				<xsl:choose>
-					<xsl:when test="$double.sided != 0 and $position = 'left'">
-						<xsl:value-of select="$Version"/>
-					</xsl:when>
-
-					<xsl:when test="$double.sided = 0 and $position = 'center'">
-					</xsl:when>
-
-					<xsl:otherwise>
-						<fo:page-number/>
-					</xsl:otherwise>
-				</xsl:choose>
-			</xsl:when>
-
-			<xsl:when test="$pageclass='titlepage'">
-			</xsl:when>
-
-			<xsl:when test="$double.sided != 0 and $sequence = 'even' and $position='left'">
-				<fo:page-number/>
-			</xsl:when>
-
-			<xsl:when test="$double.sided != 0 and $sequence = 'odd' and $position='right'">
-				<fo:page-number/>
-			</xsl:when>
-
-			<xsl:when test="$double.sided = 0 and $position='right'">
-				<fo:page-number/>
-			</xsl:when>
-
-			<xsl:when test="$double.sided != 0 and $sequence = 'odd' and $position='left'">
-				<xsl:value-of select="$Version"/>
-			</xsl:when>
-
-			<xsl:when test="$double.sided != 0 and $sequence = 'even' and $position='right'">
-				<xsl:value-of select="$Version"/>
-			</xsl:when>
-
-			<xsl:when test="$double.sided = 0 and $position='left'">
-				<xsl:value-of select="$Version"/>
-			</xsl:when>
-
-			<xsl:when test="$position='center'">
-				<xsl:value-of select="$Title"/>
-			</xsl:when>
-
-			<xsl:otherwise>
-			</xsl:otherwise>
-		</xsl:choose>
-	</xsl:template>
-
-	<xsl:template match="processing-instruction('hard-pagebreak')">
-		<fo:block break-before='page'/>
-	</xsl:template>
-
-
-	<!-- PAPER & PAGE SIZE -->
-
-	<!-- Paper type, no headers on blank pages, no double sided printing -->
-	<xsl:param name="double.sided">0</xsl:param>
-	<xsl:param name="headers.on.blank.pages">0</xsl:param>
-	<xsl:param name="footers.on.blank.pages">0</xsl:param>
-
-	<!-- FONTS & STYLES -->
-
-	<xsl:param name="hyphenate">false</xsl:param>
-
-	<!-- Default Font size -->
-	<xsl:param name="body.font.family">Helvetica</xsl:param>
-	<xsl:param name="body.font.master">10</xsl:param>
-	<xsl:param name="body.font.small">8</xsl:param>
-	<xsl:param name="title.font.family">Helvetica</xsl:param>
-
-	<!-- Line height in body text -->
-	<xsl:param name="line-height">1.4</xsl:param>
-
-	<!-- Chapter title size -->
-	<xsl:attribute-set name="chapter.titlepage.recto.style">
-		<xsl:attribute name="text-align">left</xsl:attribute>
-		<xsl:attribute name="font-weight">bold</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master * 1.8"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- Why is the font-size for chapters hardcoded in the XSL FO templates?
-	Let's remove it, so this sucker can use our attribute-set only... -->
-	<xsl:template match="d:title" mode="chapter.titlepage.recto.auto.mode">
-		<fo:block xmlns:fo="http://www.w3.org/1999/XSL/Format"
-				xsl:use-attribute-sets="chapter.titlepage.recto.style">
-			<xsl:call-template name="component.title">
-			<xsl:with-param name="node" select="ancestor-or-self::d:chapter[1]"/>
-			</xsl:call-template>
-		</fo:block>
-	</xsl:template>
-
-	<!-- Sections 1, 2 and 3 titles have a small bump factor and padding -->
-	<xsl:attribute-set name="section.title.level1.properties">
-		<xsl:attribute name="space-before.optimum">0.6em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.6em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.6em</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master * 1.5"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="section.title.level2.properties">
-		<xsl:attribute name="space-before.optimum">0.4em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.4em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.4em</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master * 1.25"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="section.title.level3.properties">
-		<xsl:attribute name="space-before.optimum">0.4em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.4em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.4em</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master * 1.0"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="section.title.level4.properties">
-		<xsl:attribute name="space-before.optimum">0.3em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.3em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.3em</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master * 0.9"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-
-	<!-- TABLES -->
-
-	<!-- Some padding inside tables -->
-	<xsl:attribute-set name="table.cell.padding">
-		<xsl:attribute name="padding-left">4pt</xsl:attribute>
-		<xsl:attribute name="padding-right">4pt</xsl:attribute>
-		<xsl:attribute name="padding-top">4pt</xsl:attribute>
-		<xsl:attribute name="padding-bottom">4pt</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- Only hairlines as frame and cell borders in tables -->
-	<xsl:param name="table.frame.border.thickness">0.1pt</xsl:param>
-	<xsl:param name="table.cell.border.thickness">0.1pt</xsl:param>
-
-	<!-- LABELS -->
-
-	<!-- Label Chapters and Sections (numbering) -->
-	<xsl:param name="chapter.autolabel" select="1"/>
-	<xsl:param name="section.autolabel" select="1"/>
-	<xsl:param name="section.autolabel.max.depth" select="1"/>
-
-	<xsl:param name="section.label.includes.component.label" select="1"/>
-	<xsl:param name="table.footnote.number.format" select="'1'"/>
-
-	<!-- PROGRAMLISTINGS -->
-
-	<!-- Verbatim text formatting (programlistings) -->
-	<xsl:attribute-set name="monospace.verbatim.properties">
-		<xsl:attribute name="font-size">7pt</xsl:attribute>
-		<xsl:attribute name="wrap-option">wrap</xsl:attribute>
-		<xsl:attribute name="keep-together.within-column">1</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="verbatim.properties">
-		<xsl:attribute name="space-before.minimum">1em</xsl:attribute>
-		<xsl:attribute name="space-before.optimum">1em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-
-		<xsl:attribute name="border-color">#444444</xsl:attribute>
-		<xsl:attribute name="border-style">solid</xsl:attribute>
-		<xsl:attribute name="border-width">0.1pt</xsl:attribute>
-		<xsl:attribute name="padding-top">0.5em</xsl:attribute>
-		<xsl:attribute name="padding-left">0.5em</xsl:attribute>
-		<xsl:attribute name="padding-right">0.5em</xsl:attribute>
-		<xsl:attribute name="padding-bottom">0.5em</xsl:attribute>
-		<xsl:attribute name="margin-left">0.5em</xsl:attribute>
-		<xsl:attribute name="margin-right">0.5em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- Shade (background) programlistings -->
-	<xsl:param name="shade.verbatim">1</xsl:param>
-	<xsl:attribute-set name="shade.verbatim.style">
-		<xsl:attribute name="background-color">#F0F0F0</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="list.block.spacing">
-		<xsl:attribute name="space-before.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="example.properties">
-		<xsl:attribute name="space-before.minimum">0.5em</xsl:attribute>
-		<xsl:attribute name="space-before.optimum">0.5em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.5em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="sidebar.properties">
-		<xsl:attribute name="border-color">#444444</xsl:attribute>
-		<xsl:attribute name="border-style">solid</xsl:attribute>
-		<xsl:attribute name="border-width">0.1pt</xsl:attribute>
-		<xsl:attribute name="background-color">#F0F0F0</xsl:attribute>
-	</xsl:attribute-set>
-
-
-	<!-- TITLE INFORMATION FOR FIGURES, EXAMPLES ETC. -->
-
-	<xsl:attribute-set name="formal.title.properties" use-attribute-sets="normal.para.spacing">
-		<xsl:attribute name="font-weight">normal</xsl:attribute>
-		<xsl:attribute name="font-style">italic</xsl:attribute>
-		<xsl:attribute name="font-size">
-			<xsl:value-of select="$body.font.master"/>
-			<xsl:text>pt</xsl:text>
-		</xsl:attribute>
-		<xsl:attribute name="hyphenate">false</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-before.optimum">0.1em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0.1em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- CALLOUTS -->
-
-	<!-- don't use images for callouts -->
-	<xsl:param name="callout.graphics">0</xsl:param>
-	<xsl:param name="callout.unicode">1</xsl:param>
-
-	<!-- Place callout marks at this column in annotated areas -->
-	<xsl:param name="callout.defaultcolumn">90</xsl:param>
-
-	<!-- MISC -->
-
-	<!-- Placement of titles -->
-	<xsl:param name="formal.title.placement">
-		figure after
-		example after
-		equation before
-		table before
-		procedure before
-	</xsl:param>
-
-	<!-- Format Variable Lists as Blocks (prevents horizontal overflow) -->
-	<xsl:param name="variablelist.as.blocks">1</xsl:param>
-	<xsl:param name="body.start.indent">0pt</xsl:param>
-
-	<!-- Remove "Chapter" from the Chapter titles... -->
-	<xsl:param name="local.l10n.xml" select="document('')"/>
-	<l:i18n xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">
-		<l:l10n language="en">
-			<l:context name="title-numbered">
-				<l:template name="chapter" text="%n.&#160;%t"/>
-				<l:template name="section" text="%n&#160;%t"/>
-			</l:context>
-			<l:context name="title">
-				<l:template name="example" text="Example&#160;%n&#160;%t"/>
-			</l:context>
-		</l:l10n>
-	</l:i18n>
-
-	<!-- admon -->
-	<xsl:param name="admon.graphics" select="0"/>
-
-	<xsl:attribute-set name="nongraphical.admonition.properties">
-		<xsl:attribute name="margin-left">0.1em</xsl:attribute>
-		<xsl:attribute name="margin-right">2em</xsl:attribute>
-		<xsl:attribute name="border-left-width">.75pt</xsl:attribute>
-		<xsl:attribute name="border-left-style">solid</xsl:attribute>
-		<xsl:attribute name="border-left-color">#5c5c4f</xsl:attribute>
-		<xsl:attribute name="padding-left">0.5em</xsl:attribute>
-		<xsl:attribute name="space-before.optimum">1.5em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">1.5em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">1.5em</xsl:attribute>
-		<xsl:attribute name="space-after.optimum">1.5em</xsl:attribute>
-		<xsl:attribute name="space-after.minimum">1.5em</xsl:attribute>
-		<xsl:attribute name="space-after.maximum">1.5em</xsl:attribute>
-	</xsl:attribute-set>
-
-    <xsl:attribute-set name="admonition.title.properties">
-		<xsl:attribute name="font-size">10pt</xsl:attribute>
-		<xsl:attribute name="font-weight">bold</xsl:attribute>
-		<xsl:attribute name="hyphenate">false</xsl:attribute>
-		<xsl:attribute name="keep-with-next.within-column">always</xsl:attribute>
-		<xsl:attribute name="margin-left">0</xsl:attribute>
-	</xsl:attribute-set>
-
-	<xsl:attribute-set name="admonition.properties">
-		<xsl:attribute name="space-before.optimum">0em</xsl:attribute>
-		<xsl:attribute name="space-before.minimum">0em</xsl:attribute>
-		<xsl:attribute name="space-before.maximum">0em</xsl:attribute>
-	</xsl:attribute-set>
-
-	<!-- Asciidoc -->
-	<xsl:template match="processing-instruction('asciidoc-br')">
-		<fo:block/>
-	</xsl:template>
-
-	<xsl:template match="processing-instruction('asciidoc-hr')">
-		<fo:block space-after="1em">
-			<fo:leader leader-pattern="rule" rule-thickness="0.5pt" rule-style="solid" leader-length.minimum="100%"/>
-		</fo:block>
-	</xsl:template>
-
-  <xsl:template match="processing-instruction('asciidoc-pagebreak')">
-    <fo:block break-after='page'/>
-  </xsl:template>
-
-	<!-- SYNTAX HIGHLIGHT -->
-
-	<xsl:template match='xslthl:keyword' mode="xslthl">
-	  <fo:inline font-weight="bold" color="#7F0055"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-	<xsl:template match='xslthl:string' mode="xslthl">
-	  <fo:inline font-weight="bold" font-style="italic" color="#2A00FF"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-	<xsl:template match='xslthl:comment' mode="xslthl">
-	  <fo:inline font-style="italic" color="#3F5FBF"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-	<xsl:template match='xslthl:tag' mode="xslthl">
-	  <fo:inline font-weight="bold" color="#3F7F7F"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-	<xsl:template match='xslthl:attribute' mode="xslthl">
-	  <fo:inline font-weight="bold" color="#7F007F"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-	<xsl:template match='xslthl:value' mode="xslthl">
-	  <fo:inline font-weight="bold" color="#2A00FF"><xsl:apply-templates mode="xslthl"/></fo:inline>
-	</xsl:template>
-
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl-config.xml

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<xslthl-config>
-	<highlighter id="java" file="./xslthl/java-hl.xml" />
-	<highlighter id="groovy" file="./xslthl/java-hl.xml" />
-	<highlighter id="html" file="./xslthl/html-hl.xml" />
-	<highlighter id="ini" file="./xslthl/ini-hl.xml" />
-	<highlighter id="php" file="./xslthl/php-hl.xml" />
-	<highlighter id="c" file="./xslthl/c-hl.xml" />
-	<highlighter id="cpp" file="./xslthl/cpp-hl.xml" />
-	<highlighter id="csharp" file="./xslthl/csharp-hl.xml" />
-	<highlighter id="python" file="./xslthl/python-hl.xml" />
-	<highlighter id="ruby" file="./xslthl/ruby-hl.xml" />
-	<highlighter id="perl" file="./xslthl/perl-hl.xml" />
-	<highlighter id="javascript" file="./xslthl/javascript-hl.xml" />
-	<highlighter id="bash" file="./xslthl/bourne-hl.xml" />
-	<highlighter id="css" file="./xslthl/css-hl.xml" />
-	<highlighter id="sql" file="./xslthl/sql2003-hl.xml" />
-	<highlighter id="asciidoc" file="./xslthl/asciidoc-hl.xml" />
-	<highlighter id="properties" file="./xslthl/properties-hl.xml" />
-	<highlighter id="json" file="./xslthl/json-hl.xml" />
-	<highlighter id="yaml" file="./xslthl/yaml-hl.xml" />
-	<namespace prefix="xslthl" uri="http://xslthl.sf.net" />
-</xslthl-config>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/asciidoc-hl.xml

@@ -1,41 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for AsciiDoc files
-
--->
-<highlighters>
-  <highlighter type="multiline-comment">
-    <start>////</start>
-    <end>////</end>
-  </highlighter>
-  <highlighter type="oneline-comment">
-    <start>//</start>
-    <solitary/>
-  </highlighter>
-  <highlighter type="regex">
-    <pattern>^(={1,6} .+)$</pattern>
-    <style>heading</style>
-    <flags>MULTILINE</flags>
-  </highlighter>
-  <highlighter type="regex">
-    <pattern>^(\.[^\.\s].+)$</pattern>
-    <style>title</style>
-    <flags>MULTILINE</flags>
-  </highlighter>
-  <highlighter type="regex">
-    <pattern>^(:!?\w.*?:)</pattern>
-    <style>attribute</style>
-    <flags>MULTILINE</flags>
-  </highlighter>
-  <highlighter type="regex">
-    <pattern>^(-|\*{1,5}|\d*\.{1,5})(?= .+$)</pattern>
-    <style>bullet</style>
-    <flags>MULTILINE</flags>
-  </highlighter>
-  <highlighter type="regex">
-    <pattern>^(\[.+\])$</pattern>
-    <style>attribute</style>
-    <flags>MULTILINE</flags>
-  </highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/bourne-hl.xml

@@ -1,95 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-
-Syntax highlighting definition for SH
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2010 Mathieu Malaterre
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
--->
-<highlighters>
-	<highlighter type="oneline-comment">#</highlighter>
-	<highlighter type="heredoc">
-		<start>&lt;&lt;</start>
-		<quote>'</quote>
-		<quote>"</quote>
-		<flag>-</flag>
-		<noWhiteSpace />
-		<looseTerminator />
-	</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-		<spanNewLines />
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<pointStarts />
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<!-- reserved words -->
-		<keyword>if</keyword>
-		<keyword>then</keyword>
-		<keyword>else</keyword>
-		<keyword>elif</keyword>
-		<keyword>fi</keyword>
-		<keyword>case</keyword>
-		<keyword>esac</keyword>
-		<keyword>for</keyword>
-		<keyword>while</keyword>
-		<keyword>until</keyword>
-		<keyword>do</keyword>
-		<keyword>done</keyword>
-		<!-- built-ins -->
-		<keyword>exec</keyword>
-		<keyword>shift</keyword>
-		<keyword>exit</keyword>
-		<keyword>times</keyword>
-		<keyword>break</keyword>
-		<keyword>export</keyword>
-		<keyword>trap</keyword>
-		<keyword>continue</keyword>
-		<keyword>readonly</keyword>
-		<keyword>wait</keyword>
-		<keyword>eval</keyword>
-		<keyword>return</keyword>
-		<!-- other commands -->
-		<keyword>cd</keyword>
-		<keyword>echo</keyword>
-		<keyword>hash</keyword>
-		<keyword>pwd</keyword>
-		<keyword>read</keyword>
-		<keyword>set</keyword>
-		<keyword>test</keyword>
-		<keyword>type</keyword>
-		<keyword>ulimit</keyword>
-		<keyword>umask</keyword>
-		<keyword>unset</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/c-hl.xml

@@ -1,117 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-Syntax highlighting definition for C
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/**</start>
-		<end>*/</end>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="oneline-comment">
-		<start><![CDATA[/// ]]></start>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="oneline-comment">
-		<!-- use the online-comment highlighter to detect directives -->
-		<start>#</start>
-		<lineBreakEscape>\</lineBreakEscape>
-		<style>directive</style>
-		<solitary />
-	</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<pointStarts />
-		<exponent>e</exponent>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>f</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>auto</keyword>
-		<keyword>_Bool</keyword>
-		<keyword>break</keyword>
-		<keyword>case</keyword>
-		<keyword>char</keyword>
-		<keyword>_Complex</keyword>
-		<keyword>const</keyword>
-		<keyword>continue</keyword>
-		<keyword>default</keyword>
-		<keyword>do</keyword>
-		<keyword>double</keyword>
-		<keyword>else</keyword>
-		<keyword>enum</keyword>
-		<keyword>extern</keyword>
-		<keyword>float</keyword>
-		<keyword>for</keyword>
-		<keyword>goto</keyword>
-		<keyword>if</keyword>
-		<keyword>_Imaginary</keyword>
-		<keyword>inline</keyword>
-		<keyword>int</keyword>
-		<keyword>long</keyword>
-		<keyword>register</keyword>
-		<keyword>restrict</keyword>
-		<keyword>return</keyword>
-		<keyword>short</keyword>
-		<keyword>signed</keyword>
-		<keyword>sizeof</keyword>
-		<keyword>static</keyword>
-		<keyword>struct</keyword>
-		<keyword>switch</keyword>
-		<keyword>typedef</keyword>
-		<keyword>union</keyword>
-		<keyword>unsigned</keyword>
-		<keyword>void</keyword>
-		<keyword>volatile</keyword>
-		<keyword>while</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/cpp-hl.xml

@@ -1,151 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for C++
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/**</start>
-		<end>*/</end>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="oneline-comment">
-		<start><![CDATA[/// ]]></start>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="oneline-comment">
-		<!-- use the online-comment highlighter to detect directives -->
-		<start>#</start>
-		<lineBreakEscape>\</lineBreakEscape>
-		<style>directive</style>
-		<solitary/>
-	</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<pointStarts />
-		<exponent>e</exponent>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>f</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<!-- C keywords -->
-		<keyword>auto</keyword>
-		<keyword>_Bool</keyword>
-		<keyword>break</keyword>
-		<keyword>case</keyword>
-		<keyword>char</keyword>
-		<keyword>_Complex</keyword>
-		<keyword>const</keyword>
-		<keyword>continue</keyword>
-		<keyword>default</keyword>
-		<keyword>do</keyword>
-		<keyword>double</keyword>
-		<keyword>else</keyword>
-		<keyword>enum</keyword>
-		<keyword>extern</keyword>
-		<keyword>float</keyword>
-		<keyword>for</keyword>
-		<keyword>goto</keyword>
-		<keyword>if</keyword>
-		<keyword>_Imaginary</keyword>
-		<keyword>inline</keyword>
-		<keyword>int</keyword>
-		<keyword>long</keyword>
-		<keyword>register</keyword>
-		<keyword>restrict</keyword>
-		<keyword>return</keyword>
-		<keyword>short</keyword>
-		<keyword>signed</keyword>
-		<keyword>sizeof</keyword>
-		<keyword>static</keyword>
-		<keyword>struct</keyword>
-		<keyword>switch</keyword>
-		<keyword>typedef</keyword>
-		<keyword>union</keyword>
-		<keyword>unsigned</keyword>
-		<keyword>void</keyword>
-		<keyword>volatile</keyword>
-		<keyword>while</keyword>
-		<!-- C++ keywords -->
-		<keyword>asm</keyword>
-		<keyword>dynamic_cast</keyword>
-		<keyword>namespace</keyword>
-		<keyword>reinterpret_cast</keyword>
-		<keyword>try</keyword>
-		<keyword>bool</keyword>
-		<keyword>explicit</keyword>
-		<keyword>new</keyword>
-		<keyword>static_cast</keyword>
-		<keyword>typeid</keyword>
-		<keyword>catch</keyword>
-		<keyword>false</keyword>
-		<keyword>operator</keyword>
-		<keyword>template</keyword>
-		<keyword>typename</keyword>
-		<keyword>class</keyword>
-		<keyword>friend</keyword>
-		<keyword>private</keyword>
-		<keyword>this</keyword>
-		<keyword>using</keyword>
-		<keyword>const_cast</keyword>
-		<keyword>inline</keyword>
-		<keyword>public</keyword>
-		<keyword>throw</keyword>
-		<keyword>virtual</keyword>
-		<keyword>delete</keyword>
-		<keyword>mutable</keyword>
-		<keyword>protected</keyword>
-		<keyword>true</keyword>
-		<keyword>wchar_t</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/csharp-hl.xml

@@ -1,194 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for C#
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/**</start>
-		<end>*/</end>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="oneline-comment">
-		<start>///</start>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="annotation">
-		<!-- annotations are called (custom) "attributes" in .NET -->
-		<start>[</start>
-		<end>]</end>
-		<valueStart>(</valueStart>
-		<valueEnd>)</valueEnd>
-	</highlighter>
-	<highlighter type="oneline-comment">
-		<!-- C# supports a couple of directives -->
-		<start>#</start>
-		<lineBreakEscape>\</lineBreakEscape>
-		<style>directive</style>
-		<solitary/>
-	</highlighter>
-	<highlighter type="string">
-		<!-- strings starting with an "@" can span multiple lines -->
-		<string>@"</string>
-		<endString>"</endString>
-		<escape>\</escape>
-		<spanNewLines />
-	</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<pointStarts />
-		<exponent>e</exponent>
-		<suffix>ul</suffix>
-		<suffix>lu</suffix>
-		<suffix>u</suffix>
-		<suffix>f</suffix>
-		<suffix>d</suffix>
-		<suffix>m</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>abstract</keyword>
-		<keyword>as</keyword>
-		<keyword>base</keyword>
-		<keyword>bool</keyword>
-		<keyword>break</keyword>
-		<keyword>byte</keyword>
-		<keyword>case</keyword>
-		<keyword>catch</keyword>
-		<keyword>char</keyword>
-		<keyword>checked</keyword>
-		<keyword>class</keyword>
-		<keyword>const</keyword>
-		<keyword>continue</keyword>
-		<keyword>decimal</keyword>
-		<keyword>default</keyword>
-		<keyword>delegate</keyword>
-		<keyword>do</keyword>
-		<keyword>double</keyword>
-		<keyword>else</keyword>
-		<keyword>enum</keyword>
-		<keyword>event</keyword>
-		<keyword>explicit</keyword>
-		<keyword>extern</keyword>
-		<keyword>false</keyword>
-		<keyword>finally</keyword>
-		<keyword>fixed</keyword>
-		<keyword>float</keyword>
-		<keyword>for</keyword>
-		<keyword>foreach</keyword>
-		<keyword>goto</keyword>
-		<keyword>if</keyword>
-		<keyword>implicit</keyword>
-		<keyword>in</keyword>
-		<keyword>int</keyword>
-		<keyword>interface</keyword>
-		<keyword>internal</keyword>
-		<keyword>is</keyword>
-		<keyword>lock</keyword>
-		<keyword>long</keyword>
-		<keyword>namespace</keyword>
-		<keyword>new</keyword>
-		<keyword>null</keyword>
-		<keyword>object</keyword>
-		<keyword>operator</keyword>
-		<keyword>out</keyword>
-		<keyword>override</keyword>
-		<keyword>params</keyword>
-		<keyword>private</keyword>
-		<keyword>protected</keyword>
-		<keyword>public</keyword>
-		<keyword>readonly</keyword>
-		<keyword>ref</keyword>
-		<keyword>return</keyword>
-		<keyword>sbyte</keyword>
-		<keyword>sealed</keyword>
-		<keyword>short</keyword>
-		<keyword>sizeof</keyword>
-		<keyword>stackalloc</keyword>
-		<keyword>static</keyword>
-		<keyword>string</keyword>
-		<keyword>struct</keyword>
-		<keyword>switch</keyword>
-		<keyword>this</keyword>
-		<keyword>throw</keyword>
-		<keyword>true</keyword>
-		<keyword>try</keyword>
-		<keyword>typeof</keyword>
-		<keyword>uint</keyword>
-		<keyword>ulong</keyword>
-		<keyword>unchecked</keyword>
-		<keyword>unsafe</keyword>
-		<keyword>ushort</keyword>
-		<keyword>using</keyword>
-		<keyword>virtual</keyword>
-		<keyword>void</keyword>
-		<keyword>volatile</keyword>
-		<keyword>while</keyword>
-	</highlighter>
-	<highlighter type="keywords">
-		<!-- special words, not really keywords -->
-		<keyword>add</keyword>
-		<keyword>alias</keyword>
-		<keyword>from</keyword>
-		<keyword>get</keyword>
-		<keyword>global</keyword>
-		<keyword>group</keyword>
-		<keyword>into</keyword>
-		<keyword>join</keyword>
-		<keyword>orderby</keyword>
-		<keyword>partial</keyword>
-		<keyword>remove</keyword>
-		<keyword>select</keyword>
-		<keyword>set</keyword>
-		<keyword>value</keyword>
-		<keyword>where</keyword>
-		<keyword>yield</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/css-hl.xml

@@ -1,176 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for CSS files
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2011-2012 Martin Hujer, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Martin Hujer <mhujer at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
-Reference: http://www.w3.org/TR/CSS21/propidx.html
-
--->
-<highlighters>
-    <highlighter type="multiline-comment">
-        <start>/*</start>
-        <end>*/</end>
-    </highlighter>
-    <highlighter type="string">
-		<string>"</string>
-        <escape>\</escape>
-        <spanNewLines/>
-    </highlighter>
-    <highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-        <spanNewLines/>
-    </highlighter>
-    <highlighter type="number">
-        <point>.</point>
-        <pointStarts />
-    </highlighter>
-    <highlighter type="word">
-    	<word>@charset</word>
-    	<word>@import</word>
-    	<word>@media</word>
-    	<word>@page</word>
-    	<style>directive</style>
-    </highlighter>
-    <highlighter type="keywords">
-        <partChars>-</partChars>
-        <keyword>azimuth</keyword>
-        <keyword>background-attachment</keyword>
-        <keyword>background-color</keyword>
-        <keyword>background-image</keyword>
-        <keyword>background-position</keyword>
-        <keyword>background-repeat</keyword>
-        <keyword>background</keyword>
-        <keyword>border-collapse</keyword>
-        <keyword>border-color</keyword>
-        <keyword>border-spacing</keyword>
-        <keyword>border-style</keyword>
-        <keyword>border-top</keyword>
-        <keyword>border-right</keyword>
-        <keyword>border-bottom</keyword>
-        <keyword>border-left</keyword>
-        <keyword>border-top-color</keyword>
-        <keyword>border-right-color</keyword>
-        <keyword>border-bottom-color</keyword>
-        <keyword>border-left-color</keyword>
-        <keyword>border-top-style</keyword>
-        <keyword>border-right-style</keyword>
-        <keyword>border-bottom-style</keyword>
-        <keyword>border-left-style</keyword>
-        <keyword>border-top-width</keyword>
-        <keyword>border-right-width</keyword>
-        <keyword>border-bottom-width</keyword>
-        <keyword>border-left-width</keyword>
-        <keyword>border-width</keyword>
-        <keyword>border</keyword>
-        <keyword>bottom</keyword>
-        <keyword>caption-side</keyword>
-        <keyword>clear</keyword>
-        <keyword>clip</keyword>
-        <keyword>color</keyword>
-        <keyword>content</keyword>
-        <keyword>counter-increment</keyword>
-        <keyword>counter-reset</keyword>
-        <keyword>cue-after</keyword>
-        <keyword>cue-before</keyword>
-        <keyword>cue</keyword>
-        <keyword>cursor</keyword>
-        <keyword>direction</keyword>
-        <keyword>display</keyword>
-        <keyword>elevation</keyword>
-        <keyword>empty-cells</keyword>
-        <keyword>float</keyword>
-        <keyword>font-family</keyword>
-        <keyword>font-size</keyword>
-        <keyword>font-style</keyword>
-        <keyword>font-variant</keyword>
-        <keyword>font-weight</keyword>
-        <keyword>font</keyword>
-        <keyword>height</keyword>
-        <keyword>left</keyword>
-        <keyword>letter-spacing</keyword>
-        <keyword>line-height</keyword>
-        <keyword>list-style-image</keyword>
-        <keyword>list-style-position</keyword>
-        <keyword>list-style-type</keyword>
-        <keyword>list-style</keyword>
-        <keyword>margin-right</keyword>
-        <keyword>margin-left</keyword>
-        <keyword>margin-top</keyword>
-        <keyword>margin-bottom</keyword>
-        <keyword>margin</keyword>
-        <keyword>max-height</keyword>
-        <keyword>max-width</keyword>
-        <keyword>min-height</keyword>
-        <keyword>min-width</keyword>
-        <keyword>orphans</keyword>
-        <keyword>outline-color</keyword>
-        <keyword>outline-style</keyword>
-        <keyword>outline-width</keyword>
-        <keyword>outline</keyword>
-        <keyword>overflow</keyword>
-        <keyword>padding-top</keyword>
-        <keyword>padding-right</keyword>
-        <keyword>padding-bottom</keyword>
-        <keyword>padding-left</keyword>
-        <keyword>padding</keyword>
-        <keyword>page-break-after</keyword>
-        <keyword>page-break-before</keyword>
-        <keyword>page-break-inside</keyword>
-        <keyword>pause-after</keyword>
-        <keyword>pause-before</keyword>
-        <keyword>pause</keyword>
-        <keyword>pitch-range</keyword>
-        <keyword>pitch</keyword>
-        <keyword>play-during</keyword>
-        <keyword>position</keyword>
-        <keyword>quotes</keyword>
-        <keyword>richness</keyword>
-        <keyword>right</keyword>
-        <keyword>speak-header</keyword>
-        <keyword>speak-numeral</keyword>
-        <keyword>speak-punctuation</keyword>
-        <keyword>speak</keyword>
-        <keyword>speech-rate</keyword>
-        <keyword>stress</keyword>
-        <keyword>table-layout</keyword>
-        <keyword>text-align</keyword>
-        <keyword>text-decoration</keyword>
-        <keyword>text-indent</keyword>
-        <keyword>text-transform</keyword>
-        <keyword>top</keyword>
-        <keyword>unicode-bidi</keyword>
-        <keyword>vertical-align</keyword>
-        <keyword>visibility</keyword>
-        <keyword>voice-family</keyword>
-        <keyword>volume</keyword>
-        <keyword>white-space</keyword>
-        <keyword>widows</keyword>
-        <keyword>width</keyword>
-        <keyword>word-spacing</keyword>
-        <keyword>z-index</keyword>
-    </highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/html-hl.xml

@@ -1,122 +0,0 @@
-<?xml version='1.0'?>
-<!--
-
-  Bakalarska prace: Zvyraznovani syntaxe v XSLT
-  Michal Molhanec 2005
-
-  myxml-hl.xml - konfigurace zvyraznovace XML, ktera zvlast zvyrazni
-                 HTML elementy a XSL elementy
-
-  This file has been customized for the Asciidoctor project (http://asciidoctor.org).
--->
-<highlighters>
-  <highlighter type="xml">
-    <elementSet>
-      <style>htmltag</style>
-      <element>a</element>
-      <element>abbr</element>
-      <element>address</element>
-      <element>area</element>
-      <element>article</element>
-      <element>aside</element>
-      <element>audio</element>
-      <element>b</element>
-      <element>base</element>
-      <element>bdi</element>
-      <element>blockquote</element>
-      <element>body</element>
-      <element>br</element>
-      <element>button</element>
-      <element>caption</element>
-      <element>canvas</element>
-      <element>cite</element>
-      <element>code</element>
-      <element>command</element>
-      <element>col</element>
-      <element>colgroup</element>
-      <element>dd</element>
-      <element>del</element>
-      <element>dialog</element>
-      <element>div</element>
-      <element>dl</element>
-      <element>dt</element>
-      <element>em</element>
-      <element>embed</element>
-      <element>fieldset</element>
-      <element>figcaption</element>
-      <element>figure</element>
-      <element>font</element>
-      <element>form</element>
-      <element>footer</element>
-      <element>h1</element>
-      <element>h2</element>
-      <element>h3</element>
-      <element>h4</element>
-      <element>h5</element>
-      <element>h6</element>
-      <element>head</element>
-      <element>header</element>
-      <element>hr</element>
-      <element>html</element>
-      <element>i</element>
-      <element>iframe</element>
-      <element>img</element>
-      <element>input</element>
-      <element>ins</element>
-      <element>kbd</element>
-      <element>label</element>
-      <element>legend</element>
-      <element>li</element>
-      <element>link</element>
-      <element>map</element>
-      <element>mark</element>
-      <element>menu</element>
-      <element>menu</element>
-      <element>meta</element>
-      <element>nav</element>
-      <element>noscript</element>
-      <element>object</element>
-      <element>ol</element>
-      <element>optgroup</element>
-      <element>option</element>
-      <element>p</element>
-      <element>param</element>
-      <element>pre</element>
-      <element>q</element>
-      <element>samp</element>
-      <element>script</element>
-      <element>section</element>
-      <element>select</element>
-      <element>small</element>
-      <element>source</element>
-      <element>span</element>
-      <element>strong</element>
-      <element>style</element>
-      <element>sub</element>
-      <element>summary</element>
-      <element>sup</element>
-      <element>table</element>
-      <element>tbody</element>
-      <element>td</element>
-      <element>textarea</element>
-      <element>tfoot</element>
-      <element>th</element>
-      <element>thead</element>
-      <element>time</element>
-      <element>title</element>
-      <element>tr</element>
-      <element>track</element>
-      <element>u</element>
-      <element>ul</element>
-      <element>var</element>
-      <element>video</element>
-      <element>wbr</element>
-      <element>xmp</element>
-      <ignoreCase/>
-    </elementSet>
-    <elementPrefix>
-      <style>namespace</style>
-      <prefix>xsl:</prefix>
-    </elementPrefix>
-  </highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/ini-hl.xml

@@ -1,45 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for ini files
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="oneline-comment">;</highlighter>
-	<highlighter type="regex">
-		<!-- ini sections -->
-		<pattern>^(\[.+\]\s*)$</pattern>
-		<style>keyword</style>
-		<flags>MULTILINE</flags>
-	</highlighter>
-	<highlighter type="regex">
-		<!-- the keys in an ini section -->
-		<pattern>^(.+)(?==)</pattern>
-		<style>attribute</style>
-		<flags>MULTILINE</flags>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/java-hl.xml

@@ -1,117 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for Java
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/**</start>
-		<end>*/</end>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="annotation">
-		<start>@</start>
-		<valueStart>(</valueStart>
-		<valueEnd>)</valueEnd>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<exponent>e</exponent>
-		<suffix>f</suffix>
-		<suffix>d</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>abstract</keyword>
-		<keyword>boolean</keyword>
-		<keyword>break</keyword>
-		<keyword>byte</keyword>
-		<keyword>case</keyword>
-		<keyword>catch</keyword>
-		<keyword>char</keyword>
-		<keyword>class</keyword>
-		<keyword>const</keyword>
-		<keyword>continue</keyword>
-		<keyword>default</keyword>
-		<keyword>do</keyword>
-		<keyword>double</keyword>
-		<keyword>else</keyword>
-		<keyword>extends</keyword>
-		<keyword>final</keyword>
-		<keyword>finally</keyword>
-		<keyword>float</keyword>
-		<keyword>for</keyword>
-		<keyword>goto</keyword>
-		<keyword>if</keyword>
-		<keyword>implements</keyword>
-		<keyword>import</keyword>
-		<keyword>instanceof</keyword>
-		<keyword>int</keyword>
-		<keyword>interface</keyword>
-		<keyword>long</keyword>
-		<keyword>native</keyword>
-		<keyword>new</keyword>
-		<keyword>package</keyword>
-		<keyword>private</keyword>
-		<keyword>protected</keyword>
-		<keyword>public</keyword>
-		<keyword>return</keyword>
-		<keyword>short</keyword>
-		<keyword>static</keyword>
-		<keyword>strictfp</keyword>
-		<keyword>super</keyword>
-		<keyword>switch</keyword>
-		<keyword>synchronized</keyword>
-		<keyword>this</keyword>
-		<keyword>throw</keyword>
-		<keyword>throws</keyword>
-		<keyword>transient</keyword>
-		<keyword>try</keyword>
-		<keyword>void</keyword>
-		<keyword>volatile</keyword>
-		<keyword>while</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/javascript-hl.xml

@@ -1,147 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for JavaScript
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<exponent>e</exponent>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>break</keyword>
-		<keyword>case</keyword>
-		<keyword>catch</keyword>
-		<keyword>continue</keyword>
-		<keyword>default</keyword>
-		<keyword>delete</keyword>
-		<keyword>do</keyword>
-		<keyword>else</keyword>
-		<keyword>finally</keyword>
-		<keyword>for</keyword>
-		<keyword>function</keyword>
-		<keyword>if</keyword>
-		<keyword>in</keyword>
-		<keyword>instanceof</keyword>
-		<keyword>new</keyword>
-		<keyword>return</keyword>
-		<keyword>switch</keyword>
-		<keyword>this</keyword>
-		<keyword>throw</keyword>
-		<keyword>try</keyword>
-		<keyword>typeof</keyword>
-		<keyword>var</keyword>
-		<keyword>void</keyword>
-		<keyword>while</keyword>
-		<keyword>with</keyword>
-		<!-- future keywords -->
-		<keyword>abstract</keyword>
-		<keyword>boolean</keyword>
-		<keyword>byte</keyword>
-		<keyword>char</keyword>
-		<keyword>class</keyword>
-		<keyword>const</keyword>
-		<keyword>debugger</keyword>
-		<keyword>double</keyword>
-		<keyword>enum</keyword>
-		<keyword>export</keyword>
-		<keyword>extends</keyword>
-		<keyword>final</keyword>
-		<keyword>float</keyword>
-		<keyword>goto</keyword>
-		<keyword>implements</keyword>
-		<keyword>import</keyword>
-		<keyword>int</keyword>
-		<keyword>interface</keyword>
-		<keyword>long</keyword>
-		<keyword>native</keyword>
-		<keyword>package</keyword>
-		<keyword>private</keyword>
-		<keyword>protected</keyword>
-		<keyword>public</keyword>
-		<keyword>short</keyword>
-		<keyword>static</keyword>
-		<keyword>super</keyword>
-		<keyword>synchronized</keyword>
-		<keyword>throws</keyword>
-		<keyword>transient</keyword>
-		<keyword>volatile</keyword>
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>prototype</keyword>
-		<!-- Global Objects -->
-		<keyword>Array</keyword>
-		<keyword>Boolean</keyword>
-		<keyword>Date</keyword>
-		<keyword>Error</keyword>
-		<keyword>EvalError</keyword>
-		<keyword>Function</keyword>
-		<keyword>Math</keyword>
-		<keyword>Number</keyword>
-		<keyword>Object</keyword>
-		<keyword>RangeError</keyword>
-		<keyword>ReferenceError</keyword>
-		<keyword>RegExp</keyword>
-		<keyword>String</keyword>
-		<keyword>SyntaxError</keyword>
-		<keyword>TypeError</keyword>
-		<keyword>URIError</keyword>
-		<!-- Global functions -->
-		<keyword>decodeURI</keyword>
-		<keyword>decodeURIComponent</keyword>
-		<keyword>encodeURI</keyword>
-		<keyword>encodeURIComponent</keyword>
-		<keyword>eval</keyword>
-		<keyword>isFinite</keyword>
-		<keyword>isNaN</keyword>
-		<keyword>parseFloat</keyword>
-		<keyword>parseInt</keyword>
-		<!-- Global properties -->
-		<keyword>Infinity</keyword>
-		<keyword>NaN</keyword>
-		<keyword>undefined</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/json-hl.xml

@@ -1,37 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<highlighters>
-	<highlighter type="oneline-comment">#</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="annotation">
-		<start>@</start>
-		<valueStart>(</valueStart>
-		<valueEnd>)</valueEnd>
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<exponent>e</exponent>
-		<suffix>f</suffix>
-		<suffix>d</suffix>
-		<suffix>l</suffix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>true</keyword>
-		<keyword>false</keyword>
-	</highlighter>
-	<highlighter type="word">
-		<word>{</word>
-		<word>}</word>
-		<word>,</word>
-		<word>[</word>
-		<word>]</word>
-		<style>keyword</style>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/perl-hl.xml

@@ -1,120 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for Perl
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="oneline-comment">#</highlighter>
-	<highlighter type="heredoc">
-		<start>&lt;&lt;</start>
-		<quote>'</quote>
-		<quote>"</quote>
-		<noWhiteSpace/>
-	</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-		<spanNewLines/>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<pointStarts />
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>if</keyword>
-		<keyword>unless</keyword>
-		<keyword>while</keyword>
-		<keyword>until</keyword>
-		<keyword>foreach</keyword>
-		<keyword>else</keyword>
-		<keyword>elsif</keyword>
-		<keyword>for</keyword>
-		<keyword>when</keyword>
-		<keyword>default</keyword>
-		<keyword>given</keyword>
-		<!-- Keywords related to the control flow of your perl program  -->
-		<keyword>caller</keyword>
-		<keyword>continue</keyword>
-		<keyword>die</keyword>
-		<keyword>do</keyword>
-		<keyword>dump</keyword>
-		<keyword>eval</keyword>
-		<keyword>exit</keyword>
-		<keyword>goto</keyword>
-		<keyword>last</keyword>
-		<keyword>next</keyword>
-		<keyword>redo</keyword>
-		<keyword>return</keyword>
-		<keyword>sub</keyword>
-		<keyword>wantarray</keyword>
-		<!-- Keywords related to scoping  -->
-		<keyword>caller</keyword>
-		<keyword>import</keyword>
-		<keyword>local</keyword>
-		<keyword>my</keyword>
-		<keyword>package</keyword>
-		<keyword>use</keyword>
-		<!-- Keywords related to perl modules  -->
-		<keyword>do</keyword>
-		<keyword>import</keyword>
-		<keyword>no</keyword>
-		<keyword>package</keyword>
-		<keyword>require</keyword>
-		<keyword>use</keyword>
-		<!-- Keywords related to classes and object-orientedness  -->
-		<keyword>bless</keyword>
-		<keyword>dbmclose</keyword>
-		<keyword>dbmopen</keyword>
-		<keyword>package</keyword>
-		<keyword>ref</keyword>
-		<keyword>tie</keyword>
-		<keyword>tied</keyword>
-		<keyword>untie</keyword>
-		<keyword>use</keyword>
-		<!-- operators -->
-		<keyword>and</keyword>
-		<keyword>or</keyword>
-		<keyword>not</keyword>
-		<keyword>eq</keyword>
-		<keyword>ne</keyword>
-		<keyword>lt</keyword>
-		<keyword>gt</keyword>
-		<keyword>le</keyword>
-		<keyword>ge</keyword>
-		<keyword>cmp</keyword>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/php-hl.xml

@@ -1,154 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for PHP
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="multiline-comment">
-		<start>/**</start>
-		<end>*/</end>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="oneline-comment">
-		<start><![CDATA[/// ]]></start>
-		<style>doccomment</style>
-	</highlighter>
-	<highlighter type="multiline-comment">
-		<start>/*</start>
-		<end>*/</end>
-	</highlighter>
-	<highlighter type="oneline-comment">//</highlighter>
-	<highlighter type="oneline-comment">#</highlighter>
-	<highlighter type="string">
-		<string>"</string>
-		<escape>\</escape>
-		<spanNewLines />
-	</highlighter>
-	<highlighter type="string">
-		<string>'</string>
-		<escape>\</escape>
-		<spanNewLines />
-	</highlighter>
-	<highlighter type="heredoc">
-		<start>&lt;&lt;&lt;</start>
-	</highlighter>
-	<highlighter type="hexnumber">
-		<prefix>0x</prefix>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="number">
-		<point>.</point>
-		<exponent>e</exponent>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="keywords">
-		<keyword>and</keyword>
-		<keyword>or</keyword>
-		<keyword>xor</keyword>
-		<keyword>__FILE__</keyword>
-		<keyword>exception</keyword>
-		<keyword>__LINE__</keyword>
-		<keyword>array</keyword>
-		<keyword>as</keyword>
-		<keyword>break</keyword>
-		<keyword>case</keyword>
-		<keyword>class</keyword>
-		<keyword>const</keyword>
-		<keyword>continue</keyword>
-		<keyword>declare</keyword>
-		<keyword>default</keyword>
-		<keyword>die</keyword>
-		<keyword>do</keyword>
-		<keyword>echo</keyword>
-		<keyword>else</keyword>
-		<keyword>elseif</keyword>
-		<keyword>empty</keyword>
-		<keyword>enddeclare</keyword>
-		<keyword>endfor</keyword>
-		<keyword>endforeach</keyword>
-		<keyword>endif</keyword>
-		<keyword>endswitch</keyword>
-		<keyword>endwhile</keyword>
-		<keyword>eval</keyword>
-		<keyword>exit</keyword>
-		<keyword>extends</keyword>
-		<keyword>for</keyword>
-		<keyword>foreach</keyword>
-		<keyword>function</keyword>
-		<keyword>global</keyword>
-		<keyword>if</keyword>
-		<keyword>include</keyword>
-		<keyword>include_once</keyword>
-		<keyword>isset</keyword>
-		<keyword>list</keyword>
-		<keyword>new</keyword>
-		<keyword>print</keyword>
-		<keyword>require</keyword>
-		<keyword>require_once</keyword>
-		<keyword>return</keyword>
-		<keyword>static</keyword>
-		<keyword>switch</keyword>
-		<keyword>unset</keyword>
-		<keyword>use</keyword>
-		<keyword>var</keyword>
-		<keyword>while</keyword>
-		<keyword>__FUNCTION__</keyword>
-		<keyword>__CLASS__</keyword>
-		<keyword>__METHOD__</keyword>
-		<keyword>final</keyword>
-		<keyword>php_user_filter</keyword>
-		<keyword>interface</keyword>
-		<keyword>implements</keyword>
-		<keyword>extends</keyword>
-		<keyword>public</keyword>
-		<keyword>private</keyword>
-		<keyword>protected</keyword>
-		<keyword>abstract</keyword>
-		<keyword>clone</keyword>
-		<keyword>try</keyword>
-		<keyword>catch</keyword>
-		<keyword>throw</keyword>
-		<keyword>cfunction</keyword>
-		<keyword>old_function</keyword>
-		<keyword>true</keyword>
-		<keyword>false</keyword>
-		<!-- PHP 5.3 -->
-		<keyword>namespace</keyword>
-		<keyword>__NAMESPACE__</keyword>
-		<keyword>goto</keyword>
-		<keyword>__DIR__</keyword>
-		<ignoreCase />
-	</highlighter>
-	<highlighter type="word">
-		<!-- highlight the php open and close tags as directives -->
-		<word>?&gt;</word>
-		<word>&lt;?php</word>
-		<word>&lt;?=</word>
-		<style>directive</style>
-	</highlighter>
-</highlighters>

spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/properties-hl.xml

@@ -1,38 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-Syntax highlighting definition for Java
-
-xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
-Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
-
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-
-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
-
--->
-<highlighters>
-	<highlighter type="oneline-comment">#</highlighter>
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spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/python-hl.xml

@@ -1,100 +0,0 @@
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-Michal Molhanec <mol1111 at users.sourceforge.net>
-Jirka Kosek <kosek at users.sourceforge.net>
-Michiel Hendriks <elmuerte at users.sourceforge.net>
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spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/ruby-hl.xml

@@ -1,109 +0,0 @@
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-Michal Molhanec <mol1111 at users.sourceforge.net>
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spring-cloud-stream-binder-kafka-docs/src/main/docbook/xsl/xslthl/sql2003-hl.xml

@@ -1,565 +0,0 @@
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-    padding-bottom:3px;
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-/*
-Formatting effect styles
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-    color:green;
-    padding:0 30px 0 0;
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-    visibility:hidden;
-    overflow:hidden;
-    font-size:10px;
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-    display:block;
-    margin:3px 10px 2px 0px;
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-.deprecatedLabel, .descfrmTypeLabel, .memberNameLabel, .memberNameLink,
-.overrideSpecifyLabel, .packageHierarchyLabel, .paramLabel, .returnLabel,
-.seeLabel, .simpleTagLabel, .throwsLabel, .typeNameLabel, .typeNameLink {
-    font-weight:bold;
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spring-cloud-stream-binder-kafka-docs/src/main/xslt/dependencyVersions.xsl

@@ -1,28 +0,0 @@
-<?xml version="1.0"?>
-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-				xmlns:mvn="http://maven.apache.org/POM/4.0.0"
-				version="1.0">
-
-	<xsl:output method="text" encoding="UTF-8" indent="no"/>
-
-	<xsl:template match="/">
-		<xsl:text>|===&#xa;</xsl:text>
-		<xsl:text>| Group ID | Artifact ID | Version&#xa;</xsl:text>
-		<xsl:for-each select="//mvn:dependency">
-			<xsl:sort select="mvn:groupId"/>
-			<xsl:sort select="mvn:artifactId"/>
-			<xsl:text>&#xa;</xsl:text>
-			<xsl:text>| `</xsl:text>
-			<xsl:copy-of select="mvn:groupId"/>
-			<xsl:text>`&#xa;</xsl:text>
-			<xsl:text>| `</xsl:text>
-			<xsl:copy-of select="mvn:artifactId"/>
-			<xsl:text>`&#xa;</xsl:text>
-			<xsl:text>| </xsl:text>
-			<xsl:copy-of select="mvn:version"/>
-			<xsl:text>&#xa;</xsl:text>
-		</xsl:for-each>
-		<xsl:text>|===</xsl:text>
-	</xsl:template>
-
-</xsl:stylesheet>

spring-cloud-stream-binder-kafka-streams/pom.xml

@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
+	<packaging>jar</packaging>
+	<name>spring-cloud-stream-binder-kafka-streams</name>
+	<description>Kafka Streams Binder Implementation</description>
+
+	<parent>
+		<groupId>org.springframework.cloud</groupId>
+		<artifactId>spring-cloud-stream-binder-kafka-parent</artifactId>
+		<version>2.1.0.RC3</version>
+	</parent>
+
+	<properties>
+		<avro.version>1.8.2</avro.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream-binder-kafka-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-autoconfigure</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.kafka</groupId>
+			<artifactId>kafka-streams</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+		</dependency>
+		<!-- Added back since Kafka still depends on it, but it has been removed by Boot due to EOL -->
+		<dependency>
+			<groupId>log4j</groupId>
+			<artifactId>log4j</artifactId>
+			<version>1.2.17</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream-binder-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-autoconfigure-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<!-- Following dependencies are needed to support Kafka 1.1.0 client-->
+		<dependency>
+			<groupId>org.apache.kafka</groupId>
+			<artifactId>kafka_2.11</artifactId>
+			<version>${kafka.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.kafka</groupId>
+			<artifactId>kafka_2.11</artifactId>
+			<version>${kafka.version}</version>
+			<classifier>test</classifier>
+			<scope>test</scope>
+		</dependency>
+		<!-- Following dependencies are only provided for testing and won't be packaged with the binder apps-->
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream-schema</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.avro</groupId>
+			<artifactId>avro</artifactId>
+			<version>${avro.version}</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.avro</groupId>
+				<artifactId>avro-maven-plugin</artifactId>
+				<version>${avro.version}</version>
+				<executions>
+					<execution>
+						<phase>generate-test-sources</phase>
+						<goals>
+							<goal>schema</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>${project.basedir}/target/generated-test-sources</outputDirectory>
+							<testOutputDirectory>${project.basedir}/target/generated-test-sources</testOutputDirectory>
+							<testSourceDirectory>${project.basedir}/src/test/resources/avro</testSourceDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/GlobalKTableBinder.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.apache.kafka.streams.kstream.GlobalKTable;
+
+import org.springframework.cloud.stream.binder.AbstractBinder;
+import org.springframework.cloud.stream.binder.BinderSpecificPropertiesProvider;
+import org.springframework.cloud.stream.binder.Binding;
+import org.springframework.cloud.stream.binder.DefaultBinding;
+import org.springframework.cloud.stream.binder.ExtendedConsumerProperties;
+import org.springframework.cloud.stream.binder.ExtendedProducerProperties;
+import org.springframework.cloud.stream.binder.ExtendedPropertiesBinder;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsExtendedBindingProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsProducerProperties;
+import org.springframework.util.StringUtils;
+
+/**
+ * An {@link AbstractBinder} implementation for {@link GlobalKTable}.
+ *
+ * Provides only consumer binding for the bound {@link GlobalKTable}.
+ * Output bindings are not allowed on this binder.
+ *
+ * @author Soby Chacko
+ * @since 2.1.0
+ */
+public class GlobalKTableBinder extends
+		AbstractBinder<GlobalKTable<Object, Object>, ExtendedConsumerProperties<KafkaStreamsConsumerProperties>, ExtendedProducerProperties<KafkaStreamsProducerProperties>>
+		implements ExtendedPropertiesBinder<GlobalKTable<Object, Object>, KafkaStreamsConsumerProperties, KafkaStreamsProducerProperties> {
+
+	private final KafkaStreamsBinderConfigurationProperties binderConfigurationProperties;
+
+	private final KafkaTopicProvisioner kafkaTopicProvisioner;
+
+	private final Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers;
+
+	private KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties = new KafkaStreamsExtendedBindingProperties();
+
+	public GlobalKTableBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties, KafkaTopicProvisioner kafkaTopicProvisioner,
+							Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		this.binderConfigurationProperties = binderConfigurationProperties;
+		this.kafkaTopicProvisioner = kafkaTopicProvisioner;
+		this.kafkaStreamsDlqDispatchers = kafkaStreamsDlqDispatchers;
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	protected Binding<GlobalKTable<Object, Object>> doBindConsumer(String name, String group, GlobalKTable<Object, Object> inputTarget,
+															ExtendedConsumerProperties<KafkaStreamsConsumerProperties> properties) {
+		if (!StringUtils.hasText(group)) {
+			group = this.binderConfigurationProperties.getApplicationId();
+		}
+		KafkaStreamsBinderUtils.prepareConsumerBinding(name, group, getApplicationContext(),
+				this.kafkaTopicProvisioner,
+				this.binderConfigurationProperties, properties, this.kafkaStreamsDlqDispatchers);
+		return new DefaultBinding<>(name, group, inputTarget, null);
+	}
+
+	@Override
+	protected Binding<GlobalKTable<Object, Object>> doBindProducer(String name, GlobalKTable<Object, Object> outboundBindTarget,
+															ExtendedProducerProperties<KafkaStreamsProducerProperties> properties) {
+		throw new UnsupportedOperationException("No producer level binding is allowed for GlobalKTable");
+	}
+
+	@Override
+	public KafkaStreamsConsumerProperties getExtendedConsumerProperties(String channelName) {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedConsumerProperties(channelName);
+	}
+
+	@Override
+	public KafkaStreamsProducerProperties getExtendedProducerProperties(String channelName) {
+		throw new UnsupportedOperationException("No producer binding is allowed and therefore no properties");
+	}
+
+	@Override
+	public String getDefaultsPrefix() {
+		return this.kafkaStreamsExtendedBindingProperties.getDefaultsPrefix();
+	}
+
+	@Override
+	public Class<? extends BinderSpecificPropertiesProvider> getExtendedPropertiesEntryClass() {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedPropertiesEntryClass();
+	}
+
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/GlobalKTableBinderConfiguration.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Configuration for GlobalKTable binder.
+ *
+ * @author Soby Chacko
+ * @since 2.1.0
+ */
+@Configuration
+public class GlobalKTableBinderConfiguration {
+
+	@Bean
+	@ConditionalOnBean(name = "outerContext")
+	public static BeanFactoryPostProcessor outerContextBeanFactoryPostProcessor() {
+		return (beanFactory) -> {
+			// It is safe to call getBean("outerContext") here, because this bean is registered as first
+			// and as independent from the parent context.
+			ApplicationContext outerContext = (ApplicationContext) beanFactory.getBean("outerContext");
+			beanFactory.registerSingleton(KafkaStreamsBinderConfigurationProperties.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBinderConfigurationProperties.class));
+			beanFactory.registerSingleton(KafkaStreamsBindingInformationCatalogue.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBindingInformationCatalogue.class));
+		};
+	}
+
+	@Bean
+	public KafkaTopicProvisioner provisioningProvider(KafkaBinderConfigurationProperties binderConfigurationProperties,
+													KafkaProperties kafkaProperties) {
+		return new KafkaTopicProvisioner(binderConfigurationProperties, kafkaProperties);
+	}
+
+	@Bean
+	public GlobalKTableBinder GlobalKTableBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+									KafkaTopicProvisioner kafkaTopicProvisioner,
+									@Qualifier("kafkaStreamsDlqDispatchers") Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		return new GlobalKTableBinder(binderConfigurationProperties, kafkaTopicProvisioner, kafkaStreamsDlqDispatchers);
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/GlobalKTableBoundElementFactory.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.apache.kafka.streams.kstream.GlobalKTable;
+
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.cloud.stream.binder.ConsumerProperties;
+import org.springframework.cloud.stream.binding.AbstractBindingTargetFactory;
+import org.springframework.cloud.stream.config.BindingServiceProperties;
+import org.springframework.util.Assert;
+
+/**
+ * {@link org.springframework.cloud.stream.binding.BindingTargetFactory} for {@link GlobalKTable}
+ *
+ * Input bindings are only created as output bindings on GlobalKTable are not allowed.
+ *
+ * @author Soby Chacko
+ * @since 2.1.0
+ */
+public class GlobalKTableBoundElementFactory extends AbstractBindingTargetFactory<GlobalKTable> {
+
+	private final BindingServiceProperties bindingServiceProperties;
+
+	GlobalKTableBoundElementFactory(BindingServiceProperties bindingServiceProperties) {
+		super(GlobalKTable.class);
+		this.bindingServiceProperties = bindingServiceProperties;
+	}
+
+	@Override
+	public GlobalKTable createInput(String name) {
+		ConsumerProperties consumerProperties = this.bindingServiceProperties.getConsumerProperties(name);
+		//Always set multiplex to true in the kafka streams binder
+		consumerProperties.setMultiplex(true);
+
+		GlobalKTableBoundElementFactory.GlobalKTableWrapperHandler wrapper = new GlobalKTableBoundElementFactory.GlobalKTableWrapperHandler();
+		ProxyFactory proxyFactory = new ProxyFactory(GlobalKTableBoundElementFactory.GlobalKTableWrapper.class, GlobalKTable.class);
+		proxyFactory.addAdvice(wrapper);
+
+		return (GlobalKTable) proxyFactory.getProxy();
+	}
+
+	@Override
+	public GlobalKTable createOutput(String name) {
+		throw new UnsupportedOperationException("Outbound operations are not allowed on target type GlobalKTable");
+	}
+
+	/**
+	 * Wrapper for GlobalKTable proxy.
+	 */
+	public interface GlobalKTableWrapper {
+		void wrap(GlobalKTable<Object, Object> delegate);
+	}
+
+	private static class GlobalKTableWrapperHandler implements GlobalKTableBoundElementFactory.GlobalKTableWrapper, MethodInterceptor {
+
+		private GlobalKTable<Object, Object> delegate;
+
+		public void wrap(GlobalKTable<Object, Object> delegate) {
+			Assert.notNull(delegate, "delegate cannot be null");
+			Assert.isNull(this.delegate, "delegate already set to " + this.delegate);
+			this.delegate = delegate;
+		}
+
+		@Override
+		public Object invoke(MethodInvocation methodInvocation) throws Throwable {
+			if (methodInvocation.getMethod().getDeclaringClass().equals(GlobalKTable.class)) {
+				Assert.notNull(this.delegate, "Trying to prepareConsumerBinding " + methodInvocation
+						.getMethod() + "  but no delegate has been set.");
+				return methodInvocation.getMethod().invoke(this.delegate, methodInvocation.getArguments());
+			}
+			else if (methodInvocation.getMethod().getDeclaringClass().equals(GlobalKTableBoundElementFactory.GlobalKTableWrapper.class)) {
+				return methodInvocation.getMethod().invoke(this, methodInvocation.getArguments());
+			}
+			else {
+				throw new IllegalStateException("Only GlobalKTable method invocations are permitted");
+			}
+		}
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/InteractiveQueryService.java

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+import java.util.Optional;
+
+import org.apache.kafka.common.serialization.Serializer;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.errors.InvalidStateStoreException;
+import org.apache.kafka.streams.state.HostInfo;
+import org.apache.kafka.streams.state.QueryableStoreType;
+import org.apache.kafka.streams.state.StreamsMetadata;
+
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.util.StringUtils;
+
+/**
+ * Services pertinent to the interactive query capabilities of Kafka Streams. This class provides
+ * services such as querying for a particular store, which instance is hosting a particular store etc.
+ * This is part of the public API of the kafka streams binder and the users can inject this service in their
+ * applications to make use of it.
+ *
+ * @author Soby Chacko
+ * @author Renwei Han
+ * @since 2.1.0
+ */
+public class InteractiveQueryService {
+
+	private final KafkaStreamsRegistry kafkaStreamsRegistry;
+	private final KafkaStreamsBinderConfigurationProperties binderConfigurationProperties;
+
+	/**
+	 * Constructor for InteractiveQueryService.
+	 *
+	 * @param kafkaStreamsRegistry holding {@link KafkaStreamsRegistry}
+	 * @param binderConfigurationProperties kafka Streams binder configuration properties
+	 */
+	public InteractiveQueryService(KafkaStreamsRegistry kafkaStreamsRegistry,
+								KafkaStreamsBinderConfigurationProperties binderConfigurationProperties) {
+		this.kafkaStreamsRegistry = kafkaStreamsRegistry;
+		this.binderConfigurationProperties = binderConfigurationProperties;
+	}
+
+	/**
+	 * Retrieve and return a queryable store by name created in the application.
+	 *
+	 * @param storeName name of the queryable store
+	 * @param storeType type of the queryable store
+	 * @param <T> generic queryable store
+	 * @return queryable store.
+	 */
+	public <T> T getQueryableStore(String storeName, QueryableStoreType<T> storeType) {
+		for (KafkaStreams kafkaStream : this.kafkaStreamsRegistry.getKafkaStreams()) {
+			try {
+				T store = kafkaStream.store(storeName, storeType);
+				if (store != null) {
+					return store;
+				}
+			}
+			catch (InvalidStateStoreException ignored) {
+				//pass through
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Gets the current {@link HostInfo} that the calling kafka streams application is running on.
+	 *
+	 * Note that the end user applications must provide `applicaiton.server` as a configuration property
+	 * when calling this method. If this is not available, then null is returned.
+	 *
+	 * @return the current {@link HostInfo}
+	 */
+	public HostInfo getCurrentHostInfo() {
+		Map<String, String> configuration = this.binderConfigurationProperties.getConfiguration();
+		if (configuration.containsKey("application.server")) {
+
+			String applicationServer = configuration.get("application.server");
+			String[] splits = StringUtils.split(applicationServer, ":");
+
+			return new HostInfo(splits[0], Integer.valueOf(splits[1]));
+		}
+		return null;
+	}
+
+	/**
+	 * Gets the {@link HostInfo} where the provided store and key are hosted on. This may not be the
+	 * current host that is running the application. Kafka Streams will look through all the consumer instances
+	 * under the same application id and retrieves the proper host.
+	 *
+	 * Note that the end user applications must provide `applicaiton.server` as a configuration property
+	 * for all the application instances when calling this method. If this is not available, then null maybe returned.
+	 *
+	 * @param <K> generic type for key
+	 * @param store store name
+	 * @param key key to look for
+	 * @param serializer {@link Serializer} for the key
+	 * @return the {@link HostInfo} where the key for the provided store is hosted currently
+	 */
+	public <K> HostInfo getHostInfo(String store, K key, Serializer<K> serializer) {
+		StreamsMetadata streamsMetadata = this.kafkaStreamsRegistry.getKafkaStreams()
+				.stream()
+				.map((k) -> Optional.ofNullable(k.metadataForKey(store, key, serializer)))
+				.filter(Optional::isPresent)
+				.map(Optional::get)
+				.findFirst()
+				.orElse(null);
+		return streamsMetadata != null ? streamsMetadata.hostInfo() : null;
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KStreamBinder.java

@@ -0,0 +1,150 @@
+/*
+ * Copyright 2017-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.kafka.common.serialization.Serde;
+import org.apache.kafka.streams.kstream.KStream;
+import org.apache.kafka.streams.kstream.Produced;
+
+import org.springframework.cloud.stream.binder.AbstractBinder;
+import org.springframework.cloud.stream.binder.BinderSpecificPropertiesProvider;
+import org.springframework.cloud.stream.binder.Binding;
+import org.springframework.cloud.stream.binder.DefaultBinding;
+import org.springframework.cloud.stream.binder.ExtendedConsumerProperties;
+import org.springframework.cloud.stream.binder.ExtendedProducerProperties;
+import org.springframework.cloud.stream.binder.ExtendedPropertiesBinder;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaProducerProperties;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsExtendedBindingProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsProducerProperties;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link org.springframework.cloud.stream.binder.Binder} implementation for {@link KStream}.
+ * This implemenation extends from the {@link AbstractBinder} directly.
+ * <p>
+ * Provides both producer and consumer bindings for the bound KStream.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ */
+class KStreamBinder extends
+		AbstractBinder<KStream<Object, Object>, ExtendedConsumerProperties<KafkaStreamsConsumerProperties>, ExtendedProducerProperties<KafkaStreamsProducerProperties>>
+		implements ExtendedPropertiesBinder<KStream<Object, Object>, KafkaStreamsConsumerProperties, KafkaStreamsProducerProperties> {
+
+	private static final Log LOG = LogFactory.getLog(KStreamBinder.class);
+
+	private final KafkaTopicProvisioner kafkaTopicProvisioner;
+
+	private KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties = new KafkaStreamsExtendedBindingProperties();
+
+	private final KafkaStreamsBinderConfigurationProperties binderConfigurationProperties;
+
+	private final KafkaStreamsMessageConversionDelegate kafkaStreamsMessageConversionDelegate;
+
+	private final KafkaStreamsBindingInformationCatalogue kafkaStreamsBindingInformationCatalogue;
+
+	private final KeyValueSerdeResolver keyValueSerdeResolver;
+
+	private final Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers;
+
+	KStreamBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+				KafkaTopicProvisioner kafkaTopicProvisioner,
+				KafkaStreamsMessageConversionDelegate kafkaStreamsMessageConversionDelegate,
+				KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue,
+				KeyValueSerdeResolver keyValueSerdeResolver,
+				Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		this.binderConfigurationProperties = binderConfigurationProperties;
+		this.kafkaTopicProvisioner = kafkaTopicProvisioner;
+		this.kafkaStreamsMessageConversionDelegate = kafkaStreamsMessageConversionDelegate;
+		this.kafkaStreamsBindingInformationCatalogue = KafkaStreamsBindingInformationCatalogue;
+		this.keyValueSerdeResolver = keyValueSerdeResolver;
+		this.kafkaStreamsDlqDispatchers = kafkaStreamsDlqDispatchers;
+	}
+
+	@Override
+	protected Binding<KStream<Object, Object>> doBindConsumer(String name, String group,
+															KStream<Object, Object> inputTarget,
+															ExtendedConsumerProperties<KafkaStreamsConsumerProperties> properties) {
+		this.kafkaStreamsBindingInformationCatalogue.registerConsumerProperties(inputTarget, properties.getExtension());
+		if (!StringUtils.hasText(group)) {
+			group = this.binderConfigurationProperties.getApplicationId();
+		}
+		KafkaStreamsBinderUtils.prepareConsumerBinding(name, group, getApplicationContext(),
+				this.kafkaTopicProvisioner,
+				this.binderConfigurationProperties, properties, this.kafkaStreamsDlqDispatchers);
+
+		return new DefaultBinding<>(name, group, inputTarget, null);
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	protected Binding<KStream<Object, Object>> doBindProducer(String name, KStream<Object, Object> outboundBindTarget,
+															ExtendedProducerProperties<KafkaStreamsProducerProperties> properties) {
+		ExtendedProducerProperties<KafkaProducerProperties> extendedProducerProperties = new ExtendedProducerProperties<>(
+				new KafkaProducerProperties());
+		this.kafkaTopicProvisioner.provisionProducerDestination(name, extendedProducerProperties);
+		Serde<?> keySerde = this.keyValueSerdeResolver.getOuboundKeySerde(properties.getExtension());
+		Serde<?> valueSerde = this.keyValueSerdeResolver.getOutboundValueSerde(properties, properties.getExtension());
+		to(properties.isUseNativeEncoding(), name, outboundBindTarget, (Serde<Object>) keySerde, (Serde<Object>) valueSerde);
+		return new DefaultBinding<>(name, null, outboundBindTarget, null);
+	}
+
+	@SuppressWarnings("unchecked")
+	private void to(boolean isNativeEncoding, String name, KStream<Object, Object> outboundBindTarget,
+					Serde<Object> keySerde, Serde<Object> valueSerde) {
+		if (!isNativeEncoding) {
+			LOG.info("Native encoding is disabled for " + name + ". Outbound message conversion done by Spring Cloud Stream.");
+			this.kafkaStreamsMessageConversionDelegate.serializeOnOutbound(outboundBindTarget)
+					.to(name, Produced.with(keySerde, valueSerde));
+		}
+		else {
+			LOG.info("Native encoding is enabled for " + name + ". Outbound serialization done at the broker.");
+			outboundBindTarget.to(name, Produced.with(keySerde, valueSerde));
+		}
+	}
+
+	@Override
+	public KafkaStreamsConsumerProperties getExtendedConsumerProperties(String channelName) {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedConsumerProperties(channelName);
+	}
+
+	@Override
+	public KafkaStreamsProducerProperties getExtendedProducerProperties(String channelName) {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedProducerProperties(channelName);
+	}
+
+	public void setKafkaStreamsExtendedBindingProperties(KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties) {
+		this.kafkaStreamsExtendedBindingProperties = kafkaStreamsExtendedBindingProperties;
+	}
+
+	@Override
+	public String getDefaultsPrefix() {
+		return this.kafkaStreamsExtendedBindingProperties.getDefaultsPrefix();
+	}
+
+	@Override
+	public Class<? extends BinderSpecificPropertiesProvider> getExtendedPropertiesEntryClass() {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedPropertiesEntryClass();
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KStreamBinderConfiguration.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2017-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsExtendedBindingProperties;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+/**
+ * Configuration for KStream binder.
+ *
+ * @author Marius Bogoevici
+ * @author Gary Russell
+ * @author Soby Chacko
+ */
+@Configuration
+@Import({KafkaAutoConfiguration.class})
+public class KStreamBinderConfiguration {
+
+
+	@Bean
+	public KafkaTopicProvisioner provisioningProvider(KafkaStreamsBinderConfigurationProperties kafkaStreamsBinderConfigurationProperties,
+													KafkaProperties kafkaProperties) {
+		return new KafkaTopicProvisioner(kafkaStreamsBinderConfigurationProperties, kafkaProperties);
+	}
+
+	@Bean
+	public KStreamBinder kStreamBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+									KafkaTopicProvisioner kafkaTopicProvisioner,
+									KafkaStreamsMessageConversionDelegate KafkaStreamsMessageConversionDelegate,
+									KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue,
+									KeyValueSerdeResolver keyValueSerdeResolver,
+									KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties,
+									@Qualifier("kafkaStreamsDlqDispatchers") Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		KStreamBinder kStreamBinder = new KStreamBinder(binderConfigurationProperties, kafkaTopicProvisioner,
+				KafkaStreamsMessageConversionDelegate, KafkaStreamsBindingInformationCatalogue,
+				keyValueSerdeResolver, kafkaStreamsDlqDispatchers);
+		kStreamBinder.setKafkaStreamsExtendedBindingProperties(kafkaStreamsExtendedBindingProperties);
+		return kStreamBinder;
+	}
+
+	@Bean
+	@ConditionalOnBean(name = "outerContext")
+	public static BeanFactoryPostProcessor outerContextBeanFactoryPostProcessor() {
+		return beanFactory -> {
+
+			// It is safe to call getBean("outerContext") here, because this bean is registered as first
+			// and as independent from the parent context.
+			ApplicationContext outerContext = (ApplicationContext) beanFactory.getBean("outerContext");
+			beanFactory.registerSingleton(KafkaStreamsBinderConfigurationProperties.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBinderConfigurationProperties.class));
+			beanFactory.registerSingleton(KafkaStreamsMessageConversionDelegate.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsMessageConversionDelegate.class));
+			beanFactory.registerSingleton(KafkaStreamsBindingInformationCatalogue.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBindingInformationCatalogue.class));
+			beanFactory.registerSingleton(KeyValueSerdeResolver.class.getSimpleName(), outerContext
+					.getBean(KeyValueSerdeResolver.class));
+			beanFactory.registerSingleton(KafkaStreamsExtendedBindingProperties.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsExtendedBindingProperties.class));
+		};
+	}
+
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KStreamBoundElementFactory.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2017-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.cloud.stream.binder.ConsumerProperties;
+import org.springframework.cloud.stream.binding.AbstractBindingTargetFactory;
+import org.springframework.cloud.stream.config.BindingProperties;
+import org.springframework.cloud.stream.config.BindingServiceProperties;
+import org.springframework.util.Assert;
+
+/**
+ * {@link org.springframework.cloud.stream.binding.BindingTargetFactory} for{@link KStream}.
+ *
+ * The implementation creates proxies for both input and output binding.
+ * The actual target will be created downstream through further binding process.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ */
+class KStreamBoundElementFactory extends AbstractBindingTargetFactory<KStream> {
+
+	private final BindingServiceProperties bindingServiceProperties;
+
+	private final KafkaStreamsBindingInformationCatalogue kafkaStreamsBindingInformationCatalogue;
+
+	KStreamBoundElementFactory(BindingServiceProperties bindingServiceProperties,
+									KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue) {
+		super(KStream.class);
+		this.bindingServiceProperties = bindingServiceProperties;
+		this.kafkaStreamsBindingInformationCatalogue = KafkaStreamsBindingInformationCatalogue;
+	}
+
+	@Override
+	public KStream createInput(String name) {
+		ConsumerProperties consumerProperties = this.bindingServiceProperties.getConsumerProperties(name);
+		//Always set multiplex to true in the kafka streams binder
+		consumerProperties.setMultiplex(true);
+		return createProxyForKStream(name);
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public KStream createOutput(final String name) {
+		return createProxyForKStream(name);
+	}
+
+	private KStream createProxyForKStream(String name) {
+		KStreamWrapperHandler wrapper = new KStreamWrapperHandler();
+		ProxyFactory proxyFactory = new ProxyFactory(KStreamWrapper.class, KStream.class);
+		proxyFactory.addAdvice(wrapper);
+
+		KStream proxy = (KStream) proxyFactory.getProxy();
+
+		//Add the binding properties to the catalogue for later retrieval during further binding steps downstream.
+		BindingProperties bindingProperties = this.bindingServiceProperties.getBindingProperties(name);
+		this.kafkaStreamsBindingInformationCatalogue.registerBindingProperties(proxy, bindingProperties);
+		return proxy;
+	}
+
+	/**
+	 * Wrapper object for KStream proxy.
+	 */
+	public interface KStreamWrapper {
+
+		void wrap(KStream<Object, Object> delegate);
+
+	}
+
+	private static class KStreamWrapperHandler implements KStreamWrapper, MethodInterceptor {
+
+		private KStream<Object, Object> delegate;
+
+		public void wrap(KStream<Object, Object> delegate) {
+			Assert.notNull(delegate, "delegate cannot be null");
+			Assert.isNull(this.delegate, "delegate already set to " + this.delegate);
+			this.delegate = delegate;
+		}
+
+		@Override
+		public Object invoke(MethodInvocation methodInvocation) throws Throwable {
+			if (methodInvocation.getMethod().getDeclaringClass().equals(KStream.class)) {
+				Assert.notNull(this.delegate, "Trying to prepareConsumerBinding " + methodInvocation
+						.getMethod() + "  but no delegate has been set.");
+				return methodInvocation.getMethod().invoke(this.delegate, methodInvocation.getArguments());
+			}
+			else if (methodInvocation.getMethod().getDeclaringClass().equals(KStreamWrapper.class)) {
+				return methodInvocation.getMethod().invoke(this, methodInvocation.getArguments());
+			}
+			else {
+				throw new IllegalStateException("Only KStream method invocations are permitted");
+			}
+		}
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KStreamStreamListenerParameterAdapter.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2017-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.cloud.stream.binding.StreamListenerParameterAdapter;
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+
+/**
+ * {@link StreamListenerParameterAdapter} for KStream.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ */
+class KStreamStreamListenerParameterAdapter implements StreamListenerParameterAdapter<KStream<?, ?>, KStream<?, ?>> {
+
+	private final KafkaStreamsMessageConversionDelegate kafkaStreamsMessageConversionDelegate;
+	private final KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue;
+
+	KStreamStreamListenerParameterAdapter(KafkaStreamsMessageConversionDelegate kafkaStreamsMessageConversionDelegate,
+												KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue) {
+		this.kafkaStreamsMessageConversionDelegate = kafkaStreamsMessageConversionDelegate;
+		this.KafkaStreamsBindingInformationCatalogue = KafkaStreamsBindingInformationCatalogue;
+	}
+
+	@Override
+	public boolean supports(Class bindingTargetType, MethodParameter methodParameter) {
+		return KStream.class.isAssignableFrom(bindingTargetType)
+				&& KStream.class.isAssignableFrom(methodParameter.getParameterType());
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public KStream adapt(KStream<?, ?> bindingTarget, MethodParameter parameter) {
+		ResolvableType resolvableType = ResolvableType.forMethodParameter(parameter);
+		final Class<?> valueClass = (resolvableType.getGeneric(1).getRawClass() != null)
+				? (resolvableType.getGeneric(1).getRawClass()) : Object.class;
+		if (this.KafkaStreamsBindingInformationCatalogue.isUseNativeDecoding(bindingTarget)) {
+			return bindingTarget;
+		}
+		else {
+			return this.kafkaStreamsMessageConversionDelegate.deserializeOnInbound(valueClass, bindingTarget);
+		}
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KStreamStreamListenerResultAdapter.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.cloud.stream.binding.StreamListenerResultAdapter;
+
+/**
+ * {@link StreamListenerResultAdapter} for KStream.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ */
+class KStreamStreamListenerResultAdapter implements StreamListenerResultAdapter<KStream, KStreamBoundElementFactory.KStreamWrapper> {
+
+	@Override
+	public boolean supports(Class<?> resultType, Class<?> boundElement) {
+		return KStream.class.isAssignableFrom(resultType) && KStream.class.isAssignableFrom(boundElement);
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public Closeable adapt(KStream streamListenerResult, KStreamBoundElementFactory.KStreamWrapper boundElement) {
+		boundElement.wrap(streamListenerResult);
+		return new NoOpCloseable();
+	}
+
+	private static final class NoOpCloseable implements Closeable {
+
+		@Override
+		public void close() throws IOException {
+
+		}
+
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KTableBinder.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.apache.kafka.streams.kstream.KTable;
+
+import org.springframework.cloud.stream.binder.AbstractBinder;
+import org.springframework.cloud.stream.binder.BinderSpecificPropertiesProvider;
+import org.springframework.cloud.stream.binder.Binding;
+import org.springframework.cloud.stream.binder.DefaultBinding;
+import org.springframework.cloud.stream.binder.ExtendedConsumerProperties;
+import org.springframework.cloud.stream.binder.ExtendedProducerProperties;
+import org.springframework.cloud.stream.binder.ExtendedPropertiesBinder;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsExtendedBindingProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsProducerProperties;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link org.springframework.cloud.stream.binder.Binder} implementation for {@link KTable}.
+ * This implemenation extends from the {@link AbstractBinder} directly.
+ *
+ * Provides only consumer binding for the bound KTable as output bindings are not allowed on it.
+ *
+ * @author Soby Chacko
+ */
+class KTableBinder extends
+		AbstractBinder<KTable<Object, Object>, ExtendedConsumerProperties<KafkaStreamsConsumerProperties>, ExtendedProducerProperties<KafkaStreamsProducerProperties>>
+		implements ExtendedPropertiesBinder<KTable<Object, Object>, KafkaStreamsConsumerProperties, KafkaStreamsProducerProperties> {
+
+	private final KafkaStreamsBinderConfigurationProperties binderConfigurationProperties;
+
+	private final KafkaTopicProvisioner kafkaTopicProvisioner;
+
+	private Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers;
+
+	private KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties = new KafkaStreamsExtendedBindingProperties();
+
+	KTableBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties, KafkaTopicProvisioner kafkaTopicProvisioner,
+				Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		this.binderConfigurationProperties = binderConfigurationProperties;
+		this.kafkaTopicProvisioner = kafkaTopicProvisioner;
+		this.kafkaStreamsDlqDispatchers = kafkaStreamsDlqDispatchers;
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	protected Binding<KTable<Object, Object>> doBindConsumer(String name, String group, KTable<Object, Object> inputTarget,
+															ExtendedConsumerProperties<KafkaStreamsConsumerProperties> properties) {
+		if (!StringUtils.hasText(group)) {
+			group = this.binderConfigurationProperties.getApplicationId();
+		}
+		KafkaStreamsBinderUtils.prepareConsumerBinding(name, group, getApplicationContext(),
+				this.kafkaTopicProvisioner,
+				this.binderConfigurationProperties, properties, this.kafkaStreamsDlqDispatchers);
+		return new DefaultBinding<>(name, group, inputTarget, null);
+	}
+
+	@Override
+	protected Binding<KTable<Object, Object>> doBindProducer(String name, KTable<Object, Object> outboundBindTarget,
+															ExtendedProducerProperties<KafkaStreamsProducerProperties> properties) {
+		throw new UnsupportedOperationException("No producer level binding is allowed for KTable");
+	}
+
+	@Override
+	public KafkaStreamsConsumerProperties getExtendedConsumerProperties(String channelName) {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedConsumerProperties(channelName);
+	}
+
+	@Override
+	public KafkaStreamsProducerProperties getExtendedProducerProperties(String channelName) {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedProducerProperties(channelName);
+	}
+
+	@Override
+	public String getDefaultsPrefix() {
+		return this.kafkaStreamsExtendedBindingProperties.getDefaultsPrefix();
+	}
+
+	@Override
+	public Class<? extends BinderSpecificPropertiesProvider> getExtendedPropertiesEntryClass() {
+		return this.kafkaStreamsExtendedBindingProperties.getExtendedPropertiesEntryClass();
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KTableBinderConfiguration.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Configuration for KTable binder.
+ *
+ * @author Soby Chacko
+ */
+@SuppressWarnings("ALL")
+@Configuration
+public class KTableBinderConfiguration {
+
+	@Bean
+	@ConditionalOnBean(name = "outerContext")
+	public static BeanFactoryPostProcessor outerContextBeanFactoryPostProcessor() {
+		return (beanFactory) -> {
+			// It is safe to call getBean("outerContext") here, because this bean is registered as first
+			// and as independent from the parent context.
+			ApplicationContext outerContext = (ApplicationContext) beanFactory.getBean("outerContext");
+			beanFactory.registerSingleton(KafkaStreamsBinderConfigurationProperties.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBinderConfigurationProperties.class));
+			beanFactory.registerSingleton(KafkaStreamsBindingInformationCatalogue.class.getSimpleName(), outerContext
+					.getBean(KafkaStreamsBindingInformationCatalogue.class));
+		};
+	}
+
+	@Bean
+	public KafkaTopicProvisioner provisioningProvider(KafkaBinderConfigurationProperties binderConfigurationProperties,
+													KafkaProperties kafkaProperties) {
+		return new KafkaTopicProvisioner(binderConfigurationProperties, kafkaProperties);
+	}
+
+	@Bean
+	public KTableBinder kTableBinder(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+									KafkaTopicProvisioner kafkaTopicProvisioner,
+									@Qualifier("kafkaStreamsDlqDispatchers") Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		KTableBinder kStreamBinder = new KTableBinder(binderConfigurationProperties, kafkaTopicProvisioner, kafkaStreamsDlqDispatchers);
+		return kStreamBinder;
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KTableBoundElementFactory.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.apache.kafka.streams.kstream.KTable;
+
+import org.springframework.aop.framework.ProxyFactory;
+import org.springframework.cloud.stream.binder.ConsumerProperties;
+import org.springframework.cloud.stream.binding.AbstractBindingTargetFactory;
+import org.springframework.cloud.stream.config.BindingServiceProperties;
+import org.springframework.util.Assert;
+
+/**
+ * {@link org.springframework.cloud.stream.binding.BindingTargetFactory} for {@link KTable}
+ *
+ * Input bindings are only created as output bindings on KTable are not allowed.
+ *
+ * @author Soby Chacko
+ */
+class KTableBoundElementFactory extends AbstractBindingTargetFactory<KTable> {
+
+	private final BindingServiceProperties bindingServiceProperties;
+
+	KTableBoundElementFactory(BindingServiceProperties bindingServiceProperties) {
+		super(KTable.class);
+		this.bindingServiceProperties = bindingServiceProperties;
+	}
+
+	@Override
+	public KTable createInput(String name) {
+		ConsumerProperties consumerProperties = this.bindingServiceProperties.getConsumerProperties(name);
+		//Always set multiplex to true in the kafka streams binder
+		consumerProperties.setMultiplex(true);
+
+		KTableBoundElementFactory.KTableWrapperHandler wrapper = new KTableBoundElementFactory.KTableWrapperHandler();
+		ProxyFactory proxyFactory = new ProxyFactory(KTableBoundElementFactory.KTableWrapper.class, KTable.class);
+		proxyFactory.addAdvice(wrapper);
+
+		return (KTable) proxyFactory.getProxy();
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public KTable createOutput(final String name) {
+		throw new UnsupportedOperationException("Outbound operations are not allowed on target type KTable");
+	}
+
+	/**
+	 * Wrapper for KTable proxy.
+	 */
+	public interface KTableWrapper {
+		void wrap(KTable<Object, Object> delegate);
+	}
+
+	private static class KTableWrapperHandler implements KTableBoundElementFactory.KTableWrapper, MethodInterceptor {
+
+		private KTable<Object, Object> delegate;
+
+		public void wrap(KTable<Object, Object> delegate) {
+			Assert.notNull(delegate, "delegate cannot be null");
+			Assert.isNull(this.delegate, "delegate already set to " + this.delegate);
+			this.delegate = delegate;
+		}
+
+		@Override
+		public Object invoke(MethodInvocation methodInvocation) throws Throwable {
+			if (methodInvocation.getMethod().getDeclaringClass().equals(KTable.class)) {
+				Assert.notNull(this.delegate, "Trying to prepareConsumerBinding " + methodInvocation
+						.getMethod() + "  but no delegate has been set.");
+				return methodInvocation.getMethod().invoke(this.delegate, methodInvocation.getArguments());
+			}
+			else if (methodInvocation.getMethod().getDeclaringClass().equals(KTableBoundElementFactory.KTableWrapper.class)) {
+				return methodInvocation.getMethod().invoke(this, methodInvocation.getArguments());
+			}
+			else {
+				throw new IllegalStateException("Only KTable method invocations are permitted");
+			}
+		}
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsApplicationSupportAutoConfiguration.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import org.apache.kafka.streams.kstream.TimeWindows;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsApplicationSupportProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Application support configuration for Kafka Streams binder.
+ *
+ * @author Soby Chacko
+ */
+@Configuration
+@EnableConfigurationProperties(KafkaStreamsApplicationSupportProperties.class)
+public class KafkaStreamsApplicationSupportAutoConfiguration {
+
+	@Bean
+	@ConditionalOnProperty("spring.cloud.stream.kafka.streams.timeWindow.length")
+	public TimeWindows configuredTimeWindow(KafkaStreamsApplicationSupportProperties processorProperties) {
+		return processorProperties.getTimeWindow().getAdvanceBy() > 0
+				? TimeWindows.of(processorProperties.getTimeWindow().getLength()).advanceBy(processorProperties.getTimeWindow().getAdvanceBy())
+				: TimeWindows.of(processorProperties.getTimeWindow().getLength());
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsBinderSupportAutoConfiguration.java

@@ -0,0 +1,284 @@
+/*
+ * Copyright 2017-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.stream.Collectors;
+
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.errors.LogAndContinueExceptionHandler;
+import org.apache.kafka.streams.errors.LogAndFailExceptionHandler;
+
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.stream.binder.BinderConfiguration;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsExtendedBindingProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.serde.CompositeNonNativeSerde;
+import org.springframework.cloud.stream.binding.BindingService;
+import org.springframework.cloud.stream.binding.StreamListenerResultAdapter;
+import org.springframework.cloud.stream.config.BinderProperties;
+import org.springframework.cloud.stream.config.BindingServiceConfiguration;
+import org.springframework.cloud.stream.config.BindingServiceProperties;
+import org.springframework.cloud.stream.converter.CompositeMessageConverterFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.kafka.config.KafkaStreamsConfiguration;
+import org.springframework.kafka.core.CleanupConfig;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * Kafka Streams binder configuration.
+ *
+ * @author Marius Bogoevici
+ * @author Soby Chacko
+ * @author Gary Russell
+ */
+@EnableConfigurationProperties(KafkaStreamsExtendedBindingProperties.class)
+@ConditionalOnBean(BindingService.class)
+@AutoConfigureAfter(BindingServiceConfiguration.class)
+public class KafkaStreamsBinderSupportAutoConfiguration {
+
+	private static final String KSTREAM_BINDER_TYPE = "kstream";
+	private static final String KTABLE_BINDER_TYPE = "ktable";
+	private static final String GLOBALKTABLE_BINDER_TYPE = "globalktable";
+
+	@Bean
+	@ConfigurationProperties(prefix = "spring.cloud.stream.kafka.streams.binder")
+	public KafkaStreamsBinderConfigurationProperties binderConfigurationProperties(KafkaProperties kafkaProperties,
+																				ConfigurableEnvironment environment,
+																				BindingServiceProperties bindingServiceProperties) {
+		final Map<String, BinderConfiguration> binderConfigurations = getBinderConfigurations(bindingServiceProperties);
+		for (Map.Entry<String, BinderConfiguration> entry : binderConfigurations.entrySet()) {
+			final BinderConfiguration binderConfiguration = entry.getValue();
+			final String binderType = binderConfiguration.getBinderType();
+			if (binderType.equals(KSTREAM_BINDER_TYPE) ||
+					binderType.equals(KTABLE_BINDER_TYPE) ||
+					binderType.equals(GLOBALKTABLE_BINDER_TYPE)) {
+				Map<String, Object> binderProperties = new HashMap<>();
+				this.flatten(null, binderConfiguration.getProperties(), binderProperties);
+				environment.getPropertySources().addFirst(new MapPropertySource("kafkaStreamsBinderEnv", binderProperties));
+			}
+		}
+		return new KafkaStreamsBinderConfigurationProperties(kafkaProperties);
+	}
+
+	//TODO: Lifted from core - good candidate for exposing as a utility method in core.
+	private static Map<String, BinderConfiguration> getBinderConfigurations(BindingServiceProperties bindingServiceProperties) {
+
+		Map<String, BinderConfiguration> binderConfigurations = new HashMap<>();
+		Map<String, BinderProperties> declaredBinders = bindingServiceProperties.getBinders();
+
+		for (Map.Entry<String, BinderProperties> binderEntry : declaredBinders.entrySet()) {
+			BinderProperties binderProperties = binderEntry.getValue();
+			binderConfigurations.put(binderEntry.getKey(),
+					new BinderConfiguration(binderProperties.getType(), binderProperties.getEnvironment(),
+							binderProperties.isInheritEnvironment(), binderProperties.isDefaultCandidate()));
+		}
+		return binderConfigurations;
+	}
+
+	//TODO: Lifted from core - good candidate for exposing as a utility method in core.
+	@SuppressWarnings("unchecked")
+	private void flatten(String propertyName, Object value, Map<String, Object> flattenedProperties) {
+		if (value instanceof Map) {
+			((Map<Object, Object>) value)
+					.forEach((k, v) -> flatten((propertyName != null ? propertyName + "." : "") + k, v, flattenedProperties));
+		}
+		else {
+			flattenedProperties.put(propertyName, value.toString());
+		}
+	}
+
+	@Bean
+	public KafkaStreamsConfiguration kafkaStreamsConfiguration(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+															Environment environment) {
+		KafkaProperties kafkaProperties = binderConfigurationProperties.getKafkaProperties();
+		Map<String, Object> streamsProperties = kafkaProperties.buildStreamsProperties();
+		if (kafkaProperties.getStreams().getApplicationId() == null) {
+			String applicationName = environment.getProperty("spring.application.name");
+			if (applicationName != null) {
+				streamsProperties.put(StreamsConfig.APPLICATION_ID_CONFIG, applicationName);
+			}
+		}
+		return new KafkaStreamsConfiguration(streamsProperties);
+	}
+
+	@Bean("streamConfigGlobalProperties")
+	public Map<String, Object> streamConfigGlobalProperties(KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+															KafkaStreamsConfiguration kafkaStreamsConfiguration) {
+
+		Properties properties = kafkaStreamsConfiguration.asProperties();
+		// Override Spring Boot bootstrap server setting if left to default with the value
+		// configured in the binder
+		if (ObjectUtils.isEmpty(properties.get(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG))) {
+			properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, binderConfigurationProperties.getKafkaConnectionString());
+		}
+		else {
+			Object bootstrapServerConfig = properties.get(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG);
+			if (bootstrapServerConfig instanceof String) {
+				@SuppressWarnings("unchecked")
+				String bootStrapServers = (String) properties
+						.get(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG);
+				if (bootStrapServers.equals("localhost:9092")) {
+					properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, binderConfigurationProperties.getKafkaConnectionString());
+				}
+			}
+		}
+
+		String binderProvidedApplicationId = binderConfigurationProperties.getApplicationId();
+		if (StringUtils.hasText(binderProvidedApplicationId)) {
+			properties.put(StreamsConfig.APPLICATION_ID_CONFIG, binderProvidedApplicationId);
+		}
+
+		properties.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.ByteArraySerde.class.getName());
+		properties.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.ByteArraySerde.class.getName());
+
+		if (binderConfigurationProperties.getSerdeError() == KafkaStreamsBinderConfigurationProperties.SerdeError.logAndContinue) {
+			properties.put(StreamsConfig.DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG,
+					LogAndContinueExceptionHandler.class.getName());
+		}
+		else if (binderConfigurationProperties.getSerdeError() == KafkaStreamsBinderConfigurationProperties.SerdeError.logAndFail) {
+			properties.put(StreamsConfig.DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG,
+					LogAndFailExceptionHandler.class.getName());
+		}
+		else if (binderConfigurationProperties.getSerdeError() == KafkaStreamsBinderConfigurationProperties.SerdeError.sendToDlq) {
+			properties.put(StreamsConfig.DEFAULT_DESERIALIZATION_EXCEPTION_HANDLER_CLASS_CONFIG,
+					SendToDlqAndContinue.class.getName());
+		}
+
+		if (!ObjectUtils.isEmpty(binderConfigurationProperties.getConfiguration())) {
+			properties.putAll(binderConfigurationProperties.getConfiguration());
+		}
+		return properties.entrySet().stream().collect(
+				Collectors.toMap((e) -> String.valueOf(e.getKey()), Map.Entry::getValue));
+	}
+
+	@Bean
+	public KStreamStreamListenerResultAdapter kstreamStreamListenerResultAdapter() {
+		return new KStreamStreamListenerResultAdapter();
+	}
+
+	@Bean
+	public KStreamStreamListenerParameterAdapter kstreamStreamListenerParameterAdapter(
+			KafkaStreamsMessageConversionDelegate kstreamBoundMessageConversionDelegate, KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue) {
+		return new KStreamStreamListenerParameterAdapter(kstreamBoundMessageConversionDelegate, KafkaStreamsBindingInformationCatalogue);
+	}
+
+	@Bean
+	public KafkaStreamsStreamListenerSetupMethodOrchestrator kafkaStreamsStreamListenerSetupMethodOrchestrator(
+			BindingServiceProperties bindingServiceProperties,
+			KafkaStreamsExtendedBindingProperties kafkaStreamsExtendedBindingProperties,
+			KeyValueSerdeResolver keyValueSerdeResolver,
+			KafkaStreamsBindingInformationCatalogue kafkaStreamsBindingInformationCatalogue,
+			KStreamStreamListenerParameterAdapter kafkaStreamListenerParameterAdapter,
+			Collection<StreamListenerResultAdapter> streamListenerResultAdapters,
+			ObjectProvider<CleanupConfig> cleanupConfig) {
+		return new KafkaStreamsStreamListenerSetupMethodOrchestrator(bindingServiceProperties,
+				kafkaStreamsExtendedBindingProperties, keyValueSerdeResolver, kafkaStreamsBindingInformationCatalogue,
+				kafkaStreamListenerParameterAdapter, streamListenerResultAdapters,
+				cleanupConfig.getIfUnique());
+	}
+
+	@Bean
+	public KafkaStreamsMessageConversionDelegate messageConversionDelegate(CompositeMessageConverterFactory compositeMessageConverterFactory,
+																		SendToDlqAndContinue sendToDlqAndContinue,
+																		KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue,
+																		KafkaStreamsBinderConfigurationProperties binderConfigurationProperties) {
+		return new KafkaStreamsMessageConversionDelegate(compositeMessageConverterFactory, sendToDlqAndContinue,
+				KafkaStreamsBindingInformationCatalogue, binderConfigurationProperties);
+	}
+
+	@Bean
+	public CompositeNonNativeSerde compositeNonNativeSerde(CompositeMessageConverterFactory compositeMessageConverterFactory) {
+		return new CompositeNonNativeSerde(compositeMessageConverterFactory);
+	}
+
+	@Bean
+	public KStreamBoundElementFactory kStreamBoundElementFactory(BindingServiceProperties bindingServiceProperties,
+																	KafkaStreamsBindingInformationCatalogue KafkaStreamsBindingInformationCatalogue) {
+		return new KStreamBoundElementFactory(bindingServiceProperties,
+				KafkaStreamsBindingInformationCatalogue);
+	}
+
+	@Bean
+	public KTableBoundElementFactory kTableBoundElementFactory(BindingServiceProperties bindingServiceProperties) {
+		return new KTableBoundElementFactory(bindingServiceProperties);
+	}
+
+	@Bean
+	public GlobalKTableBoundElementFactory globalKTableBoundElementFactory(BindingServiceProperties bindingServiceProperties) {
+		return new GlobalKTableBoundElementFactory(bindingServiceProperties);
+	}
+
+	@Bean
+	public SendToDlqAndContinue sendToDlqAndContinue() {
+		return new SendToDlqAndContinue();
+	}
+
+	@Bean
+	public KafkaStreamsBindingInformationCatalogue kafkaStreamsBindingInformationCatalogue() {
+		return new KafkaStreamsBindingInformationCatalogue();
+	}
+
+	@Bean
+	@SuppressWarnings("unchecked")
+	public KeyValueSerdeResolver keyValueSerdeResolver(@Qualifier("streamConfigGlobalProperties") Object streamConfigGlobalProperties,
+													KafkaStreamsBinderConfigurationProperties kafkaStreamsBinderConfigurationProperties) {
+		return new KeyValueSerdeResolver((Map<String, Object>) streamConfigGlobalProperties, kafkaStreamsBinderConfigurationProperties);
+	}
+
+	@Bean
+	public QueryableStoreRegistry queryableStoreTypeRegistry(KafkaStreamsRegistry kafkaStreamsRegistry) {
+		return new QueryableStoreRegistry(kafkaStreamsRegistry);
+	}
+
+	@Bean
+	public InteractiveQueryService interactiveQueryServices(KafkaStreamsRegistry kafkaStreamsRegistry,
+															KafkaStreamsBinderConfigurationProperties binderConfigurationProperties) {
+		return new InteractiveQueryService(kafkaStreamsRegistry, binderConfigurationProperties);
+	}
+
+	@Bean
+	public KafkaStreamsRegistry kafkaStreamsRegistry() {
+		return new KafkaStreamsRegistry();
+	}
+
+	@Bean
+	public StreamsBuilderFactoryManager streamsBuilderFactoryManager(KafkaStreamsBindingInformationCatalogue kafkaStreamsBindingInformationCatalogue,
+																	KafkaStreamsRegistry kafkaStreamsRegistry) {
+		return new StreamsBuilderFactoryManager(kafkaStreamsBindingInformationCatalogue, kafkaStreamsRegistry);
+	}
+
+	@Bean("kafkaStreamsDlqDispatchers")
+	public Map<String, KafkaStreamsDlqDispatch> dlqDispatchers() {
+		return new HashMap<>();
+	}
+
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsBinderUtils.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.Map;
+
+import org.springframework.cloud.stream.binder.ExtendedConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsConsumerProperties;
+import org.springframework.context.ApplicationContext;
+import org.springframework.util.StringUtils;
+
+/**
+ * Common methods used by various Kafka Streams types across the binders.
+ *
+ * @author Soby Chacko
+ */
+final class KafkaStreamsBinderUtils {
+
+	private KafkaStreamsBinderUtils() {
+
+	}
+
+	static void prepareConsumerBinding(String name, String group, ApplicationContext context,
+											KafkaTopicProvisioner kafkaTopicProvisioner,
+											KafkaStreamsBinderConfigurationProperties binderConfigurationProperties,
+											ExtendedConsumerProperties<KafkaStreamsConsumerProperties> properties,
+											Map<String, KafkaStreamsDlqDispatch> kafkaStreamsDlqDispatchers) {
+		ExtendedConsumerProperties<KafkaConsumerProperties> extendedConsumerProperties = new ExtendedConsumerProperties<>(
+				properties.getExtension());
+		if (binderConfigurationProperties.getSerdeError() == KafkaStreamsBinderConfigurationProperties.SerdeError.sendToDlq) {
+			extendedConsumerProperties.getExtension().setEnableDlq(true);
+		}
+
+		String[] inputTopics = StringUtils.commaDelimitedListToStringArray(name);
+		for (String inputTopic : inputTopics) {
+			kafkaTopicProvisioner.provisionConsumerDestination(inputTopic, group, extendedConsumerProperties);
+		}
+
+		if (extendedConsumerProperties.getExtension().isEnableDlq()) {
+			KafkaStreamsDlqDispatch kafkaStreamsDlqDispatch = !StringUtils.isEmpty(extendedConsumerProperties.getExtension().getDlqName()) ?
+					new KafkaStreamsDlqDispatch(extendedConsumerProperties.getExtension().getDlqName(), binderConfigurationProperties,
+							extendedConsumerProperties.getExtension()) : null;
+			for (String inputTopic : inputTopics) {
+				if (StringUtils.isEmpty(extendedConsumerProperties.getExtension().getDlqName())) {
+					String dlqName = "error." + inputTopic + "." + group;
+					kafkaStreamsDlqDispatch = new KafkaStreamsDlqDispatch(dlqName, binderConfigurationProperties,
+							extendedConsumerProperties.getExtension());
+				}
+
+				SendToDlqAndContinue sendToDlqAndContinue = context.getBean(SendToDlqAndContinue.class);
+				sendToDlqAndContinue.addKStreamDlqDispatch(inputTopic, kafkaStreamsDlqDispatch);
+
+				kafkaStreamsDlqDispatchers.put(inputTopic, kafkaStreamsDlqDispatch);
+			}
+		}
+	}
+
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsBindingInformationCatalogue.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.cloud.stream.binder.ConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.streams.properties.KafkaStreamsConsumerProperties;
+import org.springframework.cloud.stream.config.BindingProperties;
+import org.springframework.kafka.config.StreamsBuilderFactoryBean;
+
+/**
+ * A catalogue that provides binding information for Kafka Streams target types such as KStream.
+ * It also keeps a catalogue for the underlying {@link StreamsBuilderFactoryBean} and
+ * {@link StreamsConfig} associated with various {@link org.springframework.cloud.stream.annotation.StreamListener}
+ * methods in the {@link org.springframework.context.ApplicationContext}.
+ *
+ * @author Soby Chacko
+ */
+class KafkaStreamsBindingInformationCatalogue {
+
+	private final Map<KStream<?, ?>, BindingProperties> bindingProperties = new ConcurrentHashMap<>();
+
+	private final Map<KStream<?, ?>, KafkaStreamsConsumerProperties> consumerProperties = new ConcurrentHashMap<>();
+
+	private final Set<StreamsBuilderFactoryBean> streamsBuilderFactoryBeans = new HashSet<>();
+
+	/**
+	 * For a given bounded {@link KStream}, retrieve it's corresponding destination
+	 * on the broker.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @return destination topic on Kafka
+	 */
+	String getDestination(KStream<?, ?> bindingTarget) {
+		BindingProperties bindingProperties = this.bindingProperties.get(bindingTarget);
+		return bindingProperties.getDestination();
+	}
+
+	/**
+	 * Is native decoding is enabled on this {@link KStream}.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @return true if native decoding is enabled, fasle otherwise.
+	 */
+	boolean isUseNativeDecoding(KStream<?, ?> bindingTarget) {
+		BindingProperties bindingProperties = this.bindingProperties.get(bindingTarget);
+		if (bindingProperties.getConsumer() == null) {
+			bindingProperties.setConsumer(new ConsumerProperties());
+		}
+		return bindingProperties.getConsumer().isUseNativeDecoding();
+	}
+
+	/**
+	 * Is DLQ enabled for this {@link KStream}.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @return true if DLQ is enabled, false otherwise.
+	 */
+	boolean isDlqEnabled(KStream<?, ?> bindingTarget) {
+		return this.consumerProperties.get(bindingTarget).isEnableDlq();
+	}
+
+	/**
+	 * Retrieve the content type associated with a given {@link KStream}.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @return content Type associated.
+	 */
+	String getContentType(KStream<?, ?> bindingTarget) {
+		BindingProperties bindingProperties = this.bindingProperties.get(bindingTarget);
+		return bindingProperties.getContentType();
+	}
+
+	/**
+	 * Register a cache for bounded KStream -> {@link BindingProperties}.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @param bindingProperties {@link BindingProperties} for this KStream
+	 */
+	void registerBindingProperties(KStream<?, ?> bindingTarget, BindingProperties bindingProperties) {
+		this.bindingProperties.put(bindingTarget, bindingProperties);
+	}
+
+	/**
+	 * Register a cache for bounded KStream -> {@link KafkaStreamsConsumerProperties}.
+	 *
+	 * @param bindingTarget binding target for KStream
+	 * @param kafkaStreamsConsumerProperties consumer properties for this KStream
+	 */
+	void registerConsumerProperties(KStream<?, ?> bindingTarget, KafkaStreamsConsumerProperties kafkaStreamsConsumerProperties) {
+		this.consumerProperties.put(bindingTarget, kafkaStreamsConsumerProperties);
+	}
+
+	/**
+	 * Adds a mapping for KStream -> {@link StreamsBuilderFactoryBean}.
+	 *
+	 * @param streamsBuilderFactoryBean provides the {@link StreamsBuilderFactoryBean} mapped to the KStream
+	 */
+	void addStreamBuilderFactory(StreamsBuilderFactoryBean streamsBuilderFactoryBean) {
+		this.streamsBuilderFactoryBeans.add(streamsBuilderFactoryBean);
+	}
+
+	Set<StreamsBuilderFactoryBean> getStreamsBuilderFactoryBeans() {
+		return this.streamsBuilderFactoryBeans;
+	}
+}

spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsDlqDispatch.java

@@ -0,0 +1,146 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.stream.binder.kafka.streams;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+
+import org.springframework.cloud.stream.binder.ExtendedProducerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaConsumerProperties;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaProducerProperties;
+import org.springframework.kafka.core.DefaultKafkaProducerFactory;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.core.ProducerFactory;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.concurrent.ListenableFuture;
+import org.springframework.util.concurrent.ListenableFutureCallback;
+
+/**
+ * Send records in error to a DLQ.
+ *
+ * @author Soby Chacko
+ * @author Rafal Zukowski
+ * @author Gary Russell
+ */
+class KafkaStreamsDlqDispatch {
+
+	private final Log logger = LogFactory.getLog(getClass());
+
+	private final KafkaTemplate<byte[], byte[]> kafkaTemplate;
+
+	private final String dlqName;
+
+	KafkaStreamsDlqDispatch(String dlqName,
+							KafkaBinderConfigurationProperties kafkaBinderConfigurationProperties,
+							KafkaConsumerProperties kafkaConsumerProperties) {
+		ProducerFactory<byte[], byte[]> producerFactory = getProducerFactory(
+				new ExtendedProducerProperties<>(kafkaConsumerProperties.getDlqProducerProperties()),
+				kafkaBinderConfigurationProperties);
+
+		this.kafkaTemplate = new KafkaTemplate<>(producerFactory);
+		this.dlqName = dlqName;
+	}
+
+	@SuppressWarnings("unchecked")
+	public void sendToDlq(byte[] key, byte[] value, int partittion) {
+		ProducerRecord<byte[], byte[]> producerRecord = new ProducerRecord<>(this.dlqName, partittion,
+				key, value, null);
+
+		StringBuilder sb = new StringBuilder().append(" a message with key='")
+				.append(toDisplayString(ObjectUtils.nullSafeToString(key))).append("'")
+				.append(" and payload='")
+				.append(toDisplayString(ObjectUtils.nullSafeToString(value)))
+				.append("'").append(" received from ")
+				.append(partittion);
+		ListenableFuture<SendResult<byte[], byte[]>> sentDlq = null;
+		try {
+			sentDlq = this.kafkaTemplate.send(producerRecord);
+			sentDlq.addCallback(new ListenableFutureCallback<SendResult<byte[], byte[]>>() {
+
+				@Override
+				public void onFailure(Throwable ex) {
+					KafkaStreamsDlqDispatch.this.logger.error(
+							"Error sending to DLQ " + sb.toString(), ex);
+				}
+
+				@Override
+				public void onSuccess(SendResult<byte[], byte[]> result) {
+					if (KafkaStreamsDlqDispatch.this.logger.isDebugEnabled()) {
+						KafkaStreamsDlqDispatch.this.logger.debug(
+								"Sent to DLQ " + sb.toString());
+					}
+				}
+			});
+		}
+		catch (Exception ex) {
+			if (sentDlq == null) {
+				KafkaStreamsDlqDispatch.this.logger.error(
+						"Error sending to DLQ " + sb.toString(), ex);
+			}
+		}
+	}
+
+	private DefaultKafkaProducerFactory<byte[], byte[]> getProducerFactory(ExtendedProducerProperties<KafkaProducerProperties> producerProperties,
+																		KafkaBinderConfigurationProperties configurationProperties) {
+		Map<String, Object> props = new HashMap<>();
+		props.put(ProducerConfig.RETRIES_CONFIG, 0);
+		props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 33554432);
+		props.put(ProducerConfig.ACKS_CONFIG, configurationProperties.getRequiredAcks());
+		Map<String, Object> mergedConfig = configurationProperties.mergedProducerConfiguration();
+		if (!ObjectUtils.isEmpty(mergedConfig)) {
+			props.putAll(mergedConfig);
+		}
+		if (ObjectUtils.isEmpty(props.get(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG))) {
+			props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, configurationProperties.getKafkaConnectionString());
+		}
+		if (ObjectUtils.isEmpty(props.get(ProducerConfig.BATCH_SIZE_CONFIG))) {
+			props.put(ProducerConfig.BATCH_SIZE_CONFIG,
+					String.valueOf(producerProperties.getExtension().getBufferSize()));
+		}
+		if (ObjectUtils.isEmpty(props.get(ProducerConfig.LINGER_MS_CONFIG))) {
+			props.put(ProducerConfig.LINGER_MS_CONFIG,
+					String.valueOf(producerProperties.getExtension().getBatchTimeout()));
+		}
+		if (ObjectUtils.isEmpty(props.get(ProducerConfig.COMPRESSION_TYPE_CONFIG))) {
+			props.put(ProducerConfig.COMPRESSION_TYPE_CONFIG,
+					producerProperties.getExtension().getCompressionType().toString());
+		}
+		if (!ObjectUtils.isEmpty(producerProperties.getExtension().getConfiguration())) {
+			props.putAll(producerProperties.getExtension().getConfiguration());
+		}
+		//Always send as byte[] on dlq (the same byte[] that the consumer received)
+		props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class);
+		props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class);
+
+		return new DefaultKafkaProducerFactory<>(props);
+	}
+
+	private String toDisplayString(String original) {
+		if (original.length() <= 50) {
+			return original;
+		}
+		return original.substring(0, 50) + "...";
+	}
+}