jdbc source sample changes

sink-samples/jdbc-sink/README.adoc

@@ -38,7 +38,7 @@ The following instructions assume that you are running Kafka and MySql as Docker
 When you start the app, it will create a table in the database.
 See the method annotated with`PostConstruct` in the application for more details.
 
-* `java -jar target/sample-jdbc-sink-0.0.1-SNAPSHOT.jar`
+* `java -jar target/jdbc-sink-0.0.1-SNAPSHOT.jar`
 
 The application has a convenient test source that sends to the same destination on the broker where the sink consumes data from.
 This test source will send some test records every second.

source-samples/jdbc-source/src/main/java/demo/SampleJdbcSource.java

@@ -52,6 +52,7 @@ import java.util.concurrent.TimeUnit;
 public class SampleJdbcSource {
 
 	public static void main(String... args){
+
 		SpringApplication.run(SampleJdbcSource.class, args);
 	}
 

source-samples/jdbc-source/src/main/resources/application.yml

@@ -8,4 +8,6 @@ jdbc:
   query: select id, name, tag from test order by id
   triggerDelay: 5
 spring.cloud.stream.bindings.output.destination: test-data
-spring.cloud.stream.bindings.input.destination: test-data
+spring.cloud.stream.bindings.input.destination: test-data
+
+spring.cloud.stream.default.producer.partitionKeyExpression: '#{0}'