Initial draft of reactive dbref support.

allow resolution of list of dbrefs.

Resolve dbref of dbref.

cycles gonna be a problem here.

remove outdated code carried forward

.mvn/wrapper/maven-wrapper.properties

@@ -1,2 +1,2 @@
-#Fri Jun 03 09:32:40 CEST 2022
-distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.5/apache-maven-3.8.5-bin.zip
+#Mon Feb 20 11:58:01 CET 2023
+distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.0/apache-maven-3.9.0-bin.zip

ci/pipeline.properties

@@ -1,16 +1,16 @@
 # Java versions
-java.main.tag=17.0.4.1_1-jdk-focal
+java.main.tag=17.0.6_10-jdk-focal
 
 # Docker container images - standard
 docker.java.main.image=harbor-repo.vmware.com/dockerhub-proxy-cache/library/eclipse-temurin:${java.main.tag}
 
 # Supported versions of MongoDB
-docker.mongodb.4.4.version=4.4.17
-docker.mongodb.5.0.version=5.0.13
-docker.mongodb.6.0.version=6.0.2
+docker.mongodb.4.4.version=4.4.18
+docker.mongodb.5.0.version=5.0.14
+docker.mongodb.6.0.version=6.0.4
 
 # Supported versions of Redis
-docker.redis.6.version=6.2.6
+docker.redis.6.version=6.2.10
 
 # Supported versions of Cassandra
 docker.cassandra.3.version=3.11.14

pom.xml

@@ -5,7 +5,7 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-mongodb-parent</artifactId>
-	<version>4.0.0</version>
+	<version>4.1.x-GH-2496-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<name>Spring Data MongoDB</name>
@@ -15,7 +15,7 @@
 	<parent>
 		<groupId>org.springframework.data.build</groupId>
 		<artifactId>spring-data-parent</artifactId>
-		<version>3.0.0</version>
+		<version>3.1.0-SNAPSHOT</version>
 	</parent>
 
 	<modules>
@@ -26,8 +26,8 @@
 	<properties>
 		<project.type>multi</project.type>
 		<dist.id>spring-data-mongodb</dist.id>
-		<springdata.commons>3.0.0</springdata.commons>
-		<mongo>4.8.0</mongo>
+		<springdata.commons>3.1.0-SNAPSHOT</springdata.commons>
+		<mongo>4.9.0</mongo>
 		<mongo.reactivestreams>${mongo}</mongo.reactivestreams>
 		<jmh.version>1.19</jmh.version>
 	</properties>
@@ -145,8 +145,8 @@
 
 	<repositories>
 		<repository>
-			<id>spring-libs-release</id>
-			<url>https://repo.spring.io/libs-release</url>
+			<id>spring-libs-snapshot</id>
+			<url>https://repo.spring.io/libs-snapshot</url>
 			<snapshots>
 				<enabled>true</enabled>
 			</snapshots>

spring-data-mongodb-benchmarks/pom.xml

@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-mongodb-parent</artifactId>
-		<version>4.0.0</version>
+		<version>4.1.x-GH-2496-SNAPSHOT</version>
 		<relativePath>../pom.xml</relativePath>
 	</parent>
 

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/core/ProjectionsBenchmark.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/core/convert/DbRefMappingBenchmark.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/core/convert/MappingMongoConverterBenchmark.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/microbenchmark/AbstractMicrobenchmark.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/microbenchmark/HttpResultsWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/microbenchmark/MongoResultsWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-benchmarks/src/main/java/org/springframework/data/mongodb/microbenchmark/ResultsWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb-distribution/pom.xml

@@ -15,7 +15,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-mongodb-parent</artifactId>
-		<version>4.0.0</version>
+		<version>4.1.x-GH-2496-SNAPSHOT</version>
 		<relativePath>../pom.xml</relativePath>
 	</parent>
 

spring-data-mongodb/pom.xml

@@ -13,7 +13,7 @@
 	<parent>
 		<groupId>org.springframework.data</groupId>
 		<artifactId>spring-data-mongodb-parent</artifactId>
-		<version>4.0.0</version>
+		<version>4.1.x-GH-2496-SNAPSHOT</version>
 		<relativePath>../pom.xml</relativePath>
 	</parent>
 
@@ -112,6 +112,13 @@
 			<optional>true</optional>
 		</dependency>
 
+		<dependency>
+			<groupId>org.mongodb</groupId>
+			<artifactId>mongodb-crypt</artifactId>
+			<version>1.6.1</version>
+			<optional>true</optional>
+		</dependency>
+
 		<dependency>
 			<groupId>io.projectreactor</groupId>
 			<artifactId>reactor-core</artifactId>

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/BindableMongoExpression.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2022 the original author or authors.
+ * Copyright 2021-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/BulkOperationException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/ClientSessionException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/CodecRegistryProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/InvalidMongoDbApiUsageException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/LazyLoadingException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoCollectionUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoDatabaseFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoDatabaseUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoExpression.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2022 the original author or authors.
+ * Copyright 2021-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoManagedTypes.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoResourceHolder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoSessionProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoTransactionException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/MongoTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.
@@ -353,7 +353,7 @@ public class MongoTransactionManager extends AbstractPlatformTransactionManager
 				debugString += String.format("causallyConsistent = %s, ", session.isCausallyConsistent());
 				debugString += String.format("txActive = %s, ", session.hasActiveTransaction());
 				debugString += String.format("txNumber = %d, ", session.getServerSession().getTransactionNumber());
-				debugString += String.format("closed = %d, ", session.getServerSession().isClosed());
+				debugString += String.format("closed = %b, ", session.getServerSession().isClosed());
 				debugString += String.format("clusterTime = %s", session.getClusterTime());
 			} else {
 				debugString += "id = n/a";

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/ReactiveMongoDatabaseFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 the original author or authors.
+ * Copyright 2016-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/ReactiveMongoDatabaseUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/ReactiveMongoResourceHolder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/ReactiveMongoTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.
@@ -361,7 +361,7 @@ public class ReactiveMongoTransactionManager extends AbstractReactiveTransaction
 				debugString += String.format("causallyConsistent = %s, ", session.isCausallyConsistent());
 				debugString += String.format("txActive = %s, ", session.hasActiveTransaction());
 				debugString += String.format("txNumber = %d, ", session.getServerSession().getTransactionNumber());
-				debugString += String.format("closed = %d, ", session.getServerSession().isClosed());
+				debugString += String.format("closed = %b, ", session.getServerSession().isClosed());
 				debugString += String.format("clusterTime = %s", session.getClusterTime());
 			} else {
 				debugString += "id = n/a";

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/SessionAwareMethodInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/SessionSynchronization.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/SpringDataMongoDB.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2022 the original author or authors.
+ * Copyright 2020-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/UncategorizedMongoDbException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/aot/LazyLoadingProxyAotProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/aot/MongoAotPredicates.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/aot/MongoManagedTypesBeanRegistrationAotProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/aot/MongoRuntimeHints.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.
@@ -62,13 +62,14 @@ class MongoRuntimeHints implements RuntimeHintsRegistrar {
 							TypeReference.of(ReactiveAfterSaveCallback.class)),
 							builder -> builder.withMembers(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
 									MemberCategory.INVOKE_PUBLIC_METHODS));
-
 		}
+
 	}
 
 	private static void registerTransactionProxyHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
 
-		if (MongoAotPredicates.isSyncClientPresent(classLoader) && ClassUtils.isPresent("org.springframework.aop.SpringProxy", classLoader)) {
+		if (MongoAotPredicates.isSyncClientPresent(classLoader)
+				&& ClassUtils.isPresent("org.springframework.aop.SpringProxy", classLoader)) {
 
 			hints.proxies().registerJdkProxy(TypeReference.of("com.mongodb.client.MongoDatabase"),
 					TypeReference.of("org.springframework.aop.SpringProxy"),
@@ -78,4 +79,5 @@ class MongoRuntimeHints implements RuntimeHintsRegistrar {
 					TypeReference.of("org.springframework.core.DecoratingProxy"));
 		}
 	}
+
 }

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractMongoClientConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractReactiveMongoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 the original author or authors.
+ * Copyright 2016-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/BeanNames.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/ConnectionStringPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/EnableMongoAuditing.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/EnableReactiveMongoAuditing.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2022 the original author or authors.
+ * Copyright 2020-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/GeoJsonConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/GridFsTemplateParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MappingMongoConverterParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoAuditingBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoAuditingRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoClientParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoConfigurationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 the original author or authors.
+ * Copyright 2016-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoCredentialPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoDbFactoryParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoJmxParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoNamespaceHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoParsingUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/MongoTemplateParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/PersistentEntitiesFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2022 the original author or authors.
+ * Copyright 2020-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/ReactiveMongoAuditingRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2022 the original author or authors.
+ * Copyright 2020-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/ReadConcernPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/ReadPreferencePropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/ServerAddressPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/StringToWriteConcernConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/UUidRepresentationPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2022 the original author or authors.
+ * Copyright 2020-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/WriteConcernPropertyEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/AggregationUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.
@@ -32,7 +32,6 @@ import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
 import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty;
 import org.springframework.data.util.Lazy;
 import org.springframework.lang.Nullable;
-import org.springframework.util.ObjectUtils;
 
 /**
  * Utility methods to map {@link org.springframework.data.mongodb.core.aggregation.Aggregation} pipeline definitions and
@@ -96,12 +95,7 @@ class AggregationUtil {
 	 * @return
 	 */
 	List<Document> createPipeline(Aggregation aggregation, AggregationOperationContext context) {
-
-		if (ObjectUtils.nullSafeEquals(context, Aggregation.DEFAULT_CONTEXT)) {
-			return aggregation.toPipeline(context);
-		}
-
-		return mapAggregationPipeline(aggregation.toPipeline(context));
+		return aggregation.toPipeline(context);
 	}
 
 	/**
@@ -112,16 +106,7 @@ class AggregationUtil {
 	 * @return
 	 */
 	Document createCommand(String collection, Aggregation aggregation, AggregationOperationContext context) {
-
-		Document command = aggregation.toDocument(collection, context);
-
-		if (!ObjectUtils.nullSafeEquals(context, Aggregation.DEFAULT_CONTEXT)) {
-			return command;
-		}
-
-		command.put("pipeline", mapAggregationPipeline(command.get("pipeline", List.class)));
-
-		return command;
+		return aggregation.toDocument(collection, context);
 	}
 
 	private List<Document> mapAggregationPipeline(List<Document> pipeline) {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/BulkOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ChangeStreamEvent.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ChangeStreamOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CollectionCallback.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CollectionOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CollectionPreparer.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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.data.mongodb.core;
+
+import org.springframework.util.Assert;
+
+import com.mongodb.client.MongoCollection;
+
+/**
+ * Interface for functional preparation of a {@link MongoCollection}.
+ *
+ * @author Mark Paluch
+ * @since 4.1
+ */
+public interface CollectionPreparer<T> {
+
+	/**
+	 * Returns a preparer that always returns its input collection.
+	 *
+	 * @return a preparer that always returns its input collection.
+	 */
+	static <T> CollectionPreparer<T> identity() {
+		return it -> it;
+	}
+
+	/**
+	 * Prepare the {@code collection}.
+	 *
+	 * @param collection the collection to prepare.
+	 * @return the prepared collection.
+	 */
+	T prepare(T collection);
+
+	/**
+	 * Returns a composed {@code CollectionPreparer} that first applies this preparer to the collection, and then applies
+	 * the {@code after} preparer to the result. If evaluation of either function throws an exception, it is relayed to
+	 * the caller of the composed function.
+	 *
+	 * @param after the collection preparer to apply after this function is applied.
+	 * @return a composed {@code CollectionPreparer} that first applies this preparer and then applies the {@code after}
+	 *         preparer.
+	 */
+	default CollectionPreparer<T> andThen(CollectionPreparer<T> after) {
+		Assert.notNull(after, "After CollectionPreparer must not be null");
+		return c -> after.prepare(prepare(c));
+	}
+
+}

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CollectionPreparerSupport.java

@@ -0,0 +1,182 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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.data.mongodb.core;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+import org.bson.Document;
+
+import com.mongodb.ReadConcern;
+import com.mongodb.ReadPreference;
+import com.mongodb.client.MongoCollection;
+
+/**
+ * Support class for delegate implementations to apply {@link ReadConcern} and {@link ReadPreference} settings upon
+ * {@link CollectionPreparer preparing a collection}.
+ *
+ * @author Mark Paluch
+ * @since 4.1
+ */
+class CollectionPreparerSupport implements ReadConcernAware, ReadPreferenceAware {
+
+	private final List<Object> sources;
+
+	private CollectionPreparerSupport(List<Object> sources) {
+		this.sources = sources;
+	}
+
+	<T> T doPrepare(T collection, Function<T, ReadConcern> concernAccessor, BiFunction<T, ReadConcern, T> concernFunction,
+			Function<T, ReadPreference> preferenceAccessor, BiFunction<T, ReadPreference, T> preferenceFunction) {
+
+		T collectionToUse = collection;
+
+		for (Object source : sources) {
+			if (source instanceof ReadConcernAware rca && rca.hasReadConcern()) {
+
+				ReadConcern concern = rca.getReadConcern();
+				if (concernAccessor.apply(collectionToUse) != concern) {
+					collectionToUse = concernFunction.apply(collectionToUse, concern);
+				}
+				break;
+			}
+		}
+
+		for (Object source : sources) {
+			if (source instanceof ReadPreferenceAware rpa && rpa.hasReadPreference()) {
+
+				ReadPreference preference = rpa.getReadPreference();
+				if (preferenceAccessor.apply(collectionToUse) != preference) {
+					collectionToUse = preferenceFunction.apply(collectionToUse, preference);
+				}
+				break;
+			}
+		}
+
+		return collectionToUse;
+	}
+
+	@Override
+	public boolean hasReadConcern() {
+
+		for (Object aware : sources) {
+			if (aware instanceof ReadConcernAware rca && rca.hasReadConcern()) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	@Override
+	public ReadConcern getReadConcern() {
+
+		for (Object aware : sources) {
+			if (aware instanceof ReadConcernAware rca && rca.hasReadConcern()) {
+				return rca.getReadConcern();
+			}
+		}
+
+		return null;
+	}
+
+	@Override
+	public boolean hasReadPreference() {
+
+		for (Object aware : sources) {
+			if (aware instanceof ReadPreferenceAware rpa && rpa.hasReadPreference()) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	@Override
+	public ReadPreference getReadPreference() {
+
+		for (Object aware : sources) {
+			if (aware instanceof ReadPreferenceAware rpa && rpa.hasReadPreference()) {
+				return rpa.getReadPreference();
+			}
+		}
+
+		return null;
+	}
+
+	static class CollectionPreparerDelegate extends CollectionPreparerSupport
+			implements CollectionPreparer<MongoCollection<Document>> {
+
+		private CollectionPreparerDelegate(List<Object> sources) {
+			super(sources);
+		}
+
+		public static CollectionPreparerDelegate of(ReadPreferenceAware... awares) {
+			return of((Object[]) awares);
+		}
+
+		public static CollectionPreparerDelegate of(Object... mixedAwares) {
+
+			if (mixedAwares.length == 1 && mixedAwares[0] instanceof CollectionPreparerDelegate) {
+				return (CollectionPreparerDelegate) mixedAwares[0];
+			}
+
+			return new CollectionPreparerDelegate(Arrays.asList(mixedAwares));
+		}
+
+		@Override
+		public MongoCollection<Document> prepare(MongoCollection<Document> collection) {
+			return doPrepare(collection, MongoCollection::getReadConcern, MongoCollection::withReadConcern,
+					MongoCollection::getReadPreference, MongoCollection::withReadPreference);
+		}
+
+	}
+
+	static class ReactiveCollectionPreparerDelegate extends CollectionPreparerSupport
+			implements CollectionPreparer<com.mongodb.reactivestreams.client.MongoCollection<Document>> {
+
+		private ReactiveCollectionPreparerDelegate(List<Object> sources) {
+			super(sources);
+		}
+
+		public static ReactiveCollectionPreparerDelegate of(ReadPreferenceAware... awares) {
+			return of((Object[]) awares);
+		}
+
+		public static ReactiveCollectionPreparerDelegate of(Object... mixedAwares) {
+
+			if (mixedAwares.length == 1 && mixedAwares[0] instanceof CollectionPreparerDelegate) {
+				return (ReactiveCollectionPreparerDelegate) mixedAwares[0];
+			}
+
+			return new ReactiveCollectionPreparerDelegate(Arrays.asList(mixedAwares));
+		}
+
+		@Override
+		public com.mongodb.reactivestreams.client.MongoCollection<Document> prepare(
+				com.mongodb.reactivestreams.client.MongoCollection<Document> collection) {
+			return doPrepare(collection, //
+					com.mongodb.reactivestreams.client.MongoCollection::getReadConcern,
+					com.mongodb.reactivestreams.client.MongoCollection::withReadConcern,
+					com.mongodb.reactivestreams.client.MongoCollection::getReadPreference,
+					com.mongodb.reactivestreams.client.MongoCollection::withReadPreference);
+		}
+
+	}
+
+}

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CountQuery.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2022 the original author or authors.
+ * Copyright 2019-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/CursorPreparer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DbCallback.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultBulkOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultIndexOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2022 the original author or authors.
+ * Copyright 2011-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultIndexOperationsProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 the original author or authors.
+ * Copyright 2016-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultReactiveIndexOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 the original author or authors.
+ * Copyright 2016-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultScriptOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2022 the original author or authors.
+ * Copyright 2014-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DefaultWriteConcernResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2022 the original author or authors.
+ * Copyright 2015-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/DocumentCallbackHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 the original author or authors.
+ * Copyright 2010-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/EncryptionAlgorithms.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2022 the original author or authors.
+ * Copyright 2021-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/EntityLifecycleEventDelegate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/EntityOperations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.
@@ -17,9 +17,11 @@ package org.springframework.data.mongodb.core;
 
 import java.util.Collection;
 import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Optional;
 
+import org.bson.BsonNull;
 import org.bson.Document;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
@@ -28,6 +30,8 @@ import org.springframework.data.mapping.IdentifierAccessor;
 import org.springframework.data.mapping.MappingException;
 import org.springframework.data.mapping.PersistentEntity;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
+import org.springframework.data.mapping.PersistentPropertyPath;
+import org.springframework.data.mapping.PropertyPath;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.mapping.model.ConvertingPropertyAccessor;
 import org.springframework.data.mongodb.core.CollectionOptions.TimeSeriesOptions;
@@ -44,9 +48,11 @@ import org.springframework.data.mongodb.core.query.Criteria;
 import org.springframework.data.mongodb.core.query.Query;
 import org.springframework.data.mongodb.core.timeseries.Granularity;
 import org.springframework.data.mongodb.core.validation.Validator;
+import org.springframework.data.mongodb.util.BsonUtils;
 import org.springframework.data.projection.EntityProjection;
 import org.springframework.data.projection.EntityProjectionIntrospector;
 import org.springframework.data.projection.ProjectionFactory;
+import org.springframework.data.projection.TargetAware;
 import org.springframework.data.util.Optionals;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
@@ -114,15 +120,19 @@ class EntityOperations {
 
 		Assert.notNull(entity, "Bean must not be null");
 
+		if (entity instanceof TargetAware targetAware) {
+			return new SimpleMappedEntity((Map<String, Object>) targetAware.getTarget(), this);
+		}
+
 		if (entity instanceof String) {
-			return new UnmappedEntity(parse(entity.toString()));
+			return new UnmappedEntity(parse(entity.toString()), this);
 		}
 
 		if (entity instanceof Map) {
-			return new SimpleMappedEntity((Map<String, Object>) entity);
+			return new SimpleMappedEntity((Map<String, Object>) entity, this);
 		}
 
-		return MappedEntity.of(entity, context);
+		return MappedEntity.of(entity, context, this);
 	}
 
 	/**
@@ -139,14 +149,14 @@ class EntityOperations {
 		Assert.notNull(conversionService, "ConversionService must not be null");
 
 		if (entity instanceof String) {
-			return new UnmappedEntity(parse(entity.toString()));
+			return new UnmappedEntity(parse(entity.toString()), this);
 		}
 
 		if (entity instanceof Map) {
-			return new SimpleMappedEntity((Map<String, Object>) entity);
+			return new SimpleMappedEntity((Map<String, Object>) entity, this);
 		}
 
-		return AdaptibleMappedEntity.of(entity, context, conversionService);
+		return AdaptibleMappedEntity.of(entity, context, conversionService, this);
 	}
 
 	/**
@@ -283,6 +293,11 @@ class EntityOperations {
 	 * @see EntityProjectionIntrospector#introspect(Class, Class)
 	 */
 	public <M, D> EntityProjection<M, D> introspectProjection(Class<M> resultType, Class<D> entityType) {
+
+		MongoPersistentEntity<?> persistentEntity = queryMapper.getMappingContext().getPersistentEntity(entityType);
+		if (persistentEntity == null && !resultType.isInterface() || ClassUtils.isAssignable(Document.class, resultType)) {
+			return (EntityProjection) EntityProjection.nonProjecting(resultType);
+		}
 		return introspector.introspect(resultType, entityType);
 	}
 
@@ -362,6 +377,7 @@ class EntityOperations {
 	 * A representation of information about an entity.
 	 *
 	 * @author Oliver Gierke
+	 * @author Christoph Strobl
 	 * @since 2.1
 	 */
 	interface Entity<T> {
@@ -380,6 +396,16 @@ class EntityOperations {
 		 */
 		Object getId();
 
+		/**
+		 * Returns the property value for {@code key}.
+		 *
+		 * @param key
+		 * @return
+		 * @since 4.1
+		 */
+		@Nullable
+		Object getPropertyValue(String key);
+
 		/**
 		 * Returns the {@link Query} to find the entity by its identifier.
 		 *
@@ -450,6 +476,15 @@ class EntityOperations {
 		 * @since 2.1.2
 		 */
 		boolean isNew();
+
+		/**
+		 * @param sortObject
+		 * @return
+		 * @since 4.1
+		 * @throws IllegalStateException if a sort key yields {@literal null}.
+		 */
+		Map<String, Object> extractKeys(Document sortObject, Class<?> sourceType);
+
 	}
 
 	/**
@@ -471,7 +506,7 @@ class EntityOperations {
 		T populateIdIfNecessary(@Nullable Object id);
 
 		/**
-		 * Initializes the version property of the of the current entity if available.
+		 * Initializes the version property of the current entity if available.
 		 *
 		 * @return the entity with the version property updated if available.
 		 */
@@ -497,9 +532,11 @@ class EntityOperations {
 	private static class UnmappedEntity<T extends Map<String, Object>> implements AdaptibleEntity<T> {
 
 		private final T map;
+		private final EntityOperations entityOperations;
 
-		protected UnmappedEntity(T map) {
+		protected UnmappedEntity(T map, EntityOperations entityOperations) {
 			this.map = map;
+			this.entityOperations = entityOperations;
 		}
 
 		@Override
@@ -509,7 +546,12 @@ class EntityOperations {
 
 		@Override
 		public Object getId() {
-			return map.get(ID_FIELD);
+			return getPropertyValue(ID_FIELD);
+		}
+
+		@Override
+		public Object getPropertyValue(String key) {
+			return map.get(key);
 		}
 
 		@Override
@@ -563,12 +605,50 @@ class EntityOperations {
 		public boolean isNew() {
 			return map.get(ID_FIELD) != null;
 		}
+
+		@Override
+		public Map<String, Object> extractKeys(Document sortObject, Class<?> sourceType) {
+
+			Map<String, Object> keyset = new LinkedHashMap<>();
+			MongoPersistentEntity<?> sourceEntity = entityOperations.context.getPersistentEntity(sourceType);
+			if (sourceEntity != null && sourceEntity.hasIdProperty()) {
+				keyset.put(sourceEntity.getRequiredIdProperty().getName(), getId());
+			} else {
+				keyset.put(ID_FIELD, getId());
+			}
+
+			for (String key : sortObject.keySet()) {
+
+				Object value = resolveValue(key, sourceEntity);
+
+				if (value == null) {
+					throw new IllegalStateException(
+							String.format("Cannot extract value for key %s because its value is null", key));
+				}
+
+				keyset.put(key, value);
+			}
+
+			return keyset;
+		}
+
+		@Nullable
+		private Object resolveValue(String key, @Nullable MongoPersistentEntity<?> sourceEntity) {
+
+			if (sourceEntity == null) {
+				return BsonUtils.resolveValue(map, key);
+			}
+			PropertyPath from = PropertyPath.from(key, sourceEntity.getTypeInformation());
+			PersistentPropertyPath<MongoPersistentProperty> persistentPropertyPath = entityOperations.context
+					.getPersistentPropertyPath(from);
+			return BsonUtils.resolveValue(map, persistentPropertyPath.toDotPath(p -> p.getFieldName()));
+		}
 	}
 
 	private static class SimpleMappedEntity<T extends Map<String, Object>> extends UnmappedEntity<T> {
 
-		protected SimpleMappedEntity(T map) {
-			super(map);
+		protected SimpleMappedEntity(T map, EntityOperations entityOperations) {
+			super(map, entityOperations);
 		}
 
 		@Override
@@ -591,23 +671,26 @@ class EntityOperations {
 		private final MongoPersistentEntity<?> entity;
 		private final IdentifierAccessor idAccessor;
 		private final PersistentPropertyAccessor<T> propertyAccessor;
+		private final EntityOperations entityOperations;
 
 		protected MappedEntity(MongoPersistentEntity<?> entity, IdentifierAccessor idAccessor,
-				PersistentPropertyAccessor<T> propertyAccessor) {
+				PersistentPropertyAccessor<T> propertyAccessor, EntityOperations entityOperations) {
 
 			this.entity = entity;
 			this.idAccessor = idAccessor;
 			this.propertyAccessor = propertyAccessor;
+			this.entityOperations = entityOperations;
 		}
 
 		private static <T> MappedEntity<T> of(T bean,
-				MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> context) {
+				MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> context,
+				EntityOperations entityOperations) {
 
 			MongoPersistentEntity<?> entity = context.getRequiredPersistentEntity(bean.getClass());
 			IdentifierAccessor identifierAccessor = entity.getIdentifierAccessor(bean);
 			PersistentPropertyAccessor<T> propertyAccessor = entity.getPropertyAccessor(bean);
 
-			return new MappedEntity<>(entity, identifierAccessor, propertyAccessor);
+			return new MappedEntity<>(entity, identifierAccessor, propertyAccessor, entityOperations);
 		}
 
 		@Override
@@ -620,6 +703,11 @@ class EntityOperations {
 			return idAccessor.getRequiredIdentifier();
 		}
 
+		@Override
+		public Object getPropertyValue(String key) {
+			return propertyAccessor.getProperty(entity.getRequiredPersistentProperty(key));
+		}
+
 		@Override
 		public Query getByIdQuery() {
 
@@ -697,6 +785,60 @@ class EntityOperations {
 		public boolean isNew() {
 			return entity.isNew(propertyAccessor.getBean());
 		}
+
+		@Override
+		public Map<String, Object> extractKeys(Document sortObject, Class<?> sourceType) {
+
+			Map<String, Object> keyset = new LinkedHashMap<>();
+			MongoPersistentEntity<?> sourceEntity = entityOperations.context.getPersistentEntity(sourceType);
+			if (sourceEntity != null && sourceEntity.hasIdProperty()) {
+				keyset.put(sourceEntity.getRequiredIdProperty().getName(), getId());
+			} else {
+				keyset.put(entity.getRequiredIdProperty().getName(), getId());
+			}
+
+			for (String key : sortObject.keySet()) {
+
+				Object value;
+				if (key.indexOf('.') != -1) {
+
+					// follow the path across nested levels.
+					// TODO: We should have a MongoDB-specific property path abstraction to allow diving into Document.
+					value = getNestedPropertyValue(key);
+				} else {
+					value = getPropertyValue(key);
+				}
+
+				if (value == null) {
+					throw new IllegalStateException(
+							String.format("Cannot extract value for key %s because its value is null", key));
+				}
+
+				keyset.put(key, value);
+			}
+
+			return keyset;
+		}
+
+		@Nullable
+		private Object getNestedPropertyValue(String key) {
+
+			String[] segments = key.split("\\.");
+			Entity<?> currentEntity = this;
+			Object currentValue = BsonNull.VALUE;
+
+			for (int i = 0; i < segments.length; i++) {
+
+				String segment = segments[i];
+				currentValue = currentEntity.getPropertyValue(segment);
+
+				if (i < segments.length - 1) {
+					currentEntity = entityOperations.forEntity(currentValue);
+				}
+			}
+
+			return currentValue != null ? currentValue : BsonNull.VALUE;
+		}
 	}
 
 	private static class AdaptibleMappedEntity<T> extends MappedEntity<T> implements AdaptibleEntity<T> {
@@ -706,9 +848,9 @@ class EntityOperations {
 		private final IdentifierAccessor identifierAccessor;
 
 		private AdaptibleMappedEntity(MongoPersistentEntity<?> entity, IdentifierAccessor identifierAccessor,
-				ConvertingPropertyAccessor<T> propertyAccessor) {
+				ConvertingPropertyAccessor<T> propertyAccessor, EntityOperations entityOperations) {
 
-			super(entity, identifierAccessor, propertyAccessor);
+			super(entity, identifierAccessor, propertyAccessor, entityOperations);
 
 			this.entity = entity;
 			this.propertyAccessor = propertyAccessor;
@@ -717,14 +859,14 @@ class EntityOperations {
 
 		private static <T> AdaptibleEntity<T> of(T bean,
 				MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> context,
-				ConversionService conversionService) {
+				ConversionService conversionService, EntityOperations entityOperations) {
 
 			MongoPersistentEntity<?> entity = context.getRequiredPersistentEntity(bean.getClass());
 			IdentifierAccessor identifierAccessor = entity.getIdentifierAccessor(bean);
 			PersistentPropertyAccessor<T> propertyAccessor = entity.getPropertyAccessor(bean);
 
 			return new AdaptibleMappedEntity<>(entity, identifierAccessor,
-					new ConvertingPropertyAccessor<>(propertyAccessor, conversionService));
+					new ConvertingPropertyAccessor<>(propertyAccessor, conversionService), entityOperations);
 		}
 
 		@Nullable
@@ -825,6 +967,14 @@ class EntityOperations {
 		 * @since 3.3
 		 */
 		TimeSeriesOptions mapTimeSeriesOptions(TimeSeriesOptions options);
+
+		/**
+		 * @return the name of the id field.
+		 * @since 4.1
+		 */
+		default String getIdKeyName() {
+			return ID_FIELD;
+		}
 	}
 
 	/**
@@ -947,6 +1097,11 @@ class EntityOperations {
 			MongoPersistentProperty persistentProperty = entity.getPersistentProperty(name);
 			return persistentProperty != null ? persistentProperty.getFieldName() : name;
 		}
+
+		@Override
+		public String getIdKeyName() {
+			return entity.getIdProperty().getName();
+		}
 	}
 
 }

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableAggregationOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableAggregationOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableFindOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.
@@ -20,6 +20,9 @@ import java.util.Optional;
 import java.util.stream.Stream;
 
 import org.springframework.dao.DataAccessException;
+import org.springframework.data.domain.KeysetScrollPosition;
+import org.springframework.data.domain.ScrollPosition;
+import org.springframework.data.domain.Window;
 import org.springframework.data.geo.GeoResults;
 import org.springframework.data.mongodb.core.query.CriteriaDefinition;
 import org.springframework.data.mongodb.core.query.NearQuery;
@@ -124,12 +127,28 @@ public interface ExecutableFindOperation {
 		Stream<T> stream();
 
 		/**
-		 * Get the number of matching elements.
-		 * <br />
-		 * This method uses an {@link com.mongodb.client.MongoCollection#countDocuments(org.bson.conversions.Bson, com.mongodb.client.model.CountOptions) aggregation
-		 * execution} even for empty {@link Query queries} which may have an impact on performance, but guarantees shard,
-		 * session and transaction compliance. In case an inaccurate count satisfies the applications needs use
-		 * {@link MongoOperations#estimatedCount(String)} for empty queries instead.
+		 * Return a window of elements either starting or resuming at
+		 * {@link org.springframework.data.domain.ScrollPosition}.
+		 * <p>
+		 * When using {@link KeysetScrollPosition}, make sure to use non-nullable
+		 * {@link org.springframework.data.domain.Sort sort properties} as MongoDB does not support criteria to reconstruct
+		 * a query result from absent document fields or {@code null} values through {@code $gt/$lt} operators.
+		 *
+		 * @param scrollPosition the scroll position.
+		 * @return a window of the resulting elements.
+		 * @since 4.1
+		 * @see org.springframework.data.domain.OffsetScrollPosition
+		 * @see org.springframework.data.domain.KeysetScrollPosition
+		 */
+		Window<T> scroll(ScrollPosition scrollPosition);
+
+		/**
+		 * Get the number of matching elements. <br />
+		 * This method uses an
+		 * {@link com.mongodb.client.MongoCollection#countDocuments(org.bson.conversions.Bson, com.mongodb.client.model.CountOptions)
+		 * aggregation execution} even for empty {@link Query queries} which may have an impact on performance, but
+		 * guarantees shard, session and transaction compliance. In case an inaccurate count satisfies the applications
+		 * needs use {@link MongoOperations#estimatedCount(String)} for empty queries instead.
 		 *
 		 * @return total number of matching elements.
 		 */

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableFindOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.
@@ -20,8 +20,9 @@ import java.util.Optional;
 import java.util.stream.Stream;
 
 import org.bson.Document;
-
 import org.springframework.dao.IncorrectResultSizeDataAccessException;
+import org.springframework.data.domain.Window;
+import org.springframework.data.domain.ScrollPosition;
 import org.springframework.data.mongodb.core.query.NearQuery;
 import org.springframework.data.mongodb.core.query.Query;
 import org.springframework.data.mongodb.core.query.SerializationUtils;
@@ -72,8 +73,8 @@ class ExecutableFindOperationSupport implements ExecutableFindOperation {
 		private final @Nullable String collection;
 		private final Query query;
 
-		ExecutableFindSupport(MongoTemplate template, Class<?> domainType, Class<T> returnType,
-				@Nullable String collection, Query query) {
+		ExecutableFindSupport(MongoTemplate template, Class<?> domainType, Class<T> returnType, @Nullable String collection,
+				Query query) {
 			this.template = template;
 			this.domainType = domainType;
 			this.returnType = returnType;
@@ -139,6 +140,11 @@ class ExecutableFindOperationSupport implements ExecutableFindOperation {
 			return doStream();
 		}
 
+		@Override
+		public Window<T> scroll(ScrollPosition scrollPosition) {
+			return template.doScroll(query.with(scrollPosition), domainType, returnType, getCollectionName());
+		}
+
 		@Override
 		public TerminatingFindNear<T> near(NearQuery nearQuery) {
 			return () -> template.geoNear(nearQuery, domainType, getCollectionName(), returnType);
@@ -168,8 +174,8 @@ class ExecutableFindOperationSupport implements ExecutableFindOperation {
 			Document queryObject = query.getQueryObject();
 			Document fieldsObject = query.getFieldsObject();
 
-			return template.doFind(getCollectionName(), queryObject, fieldsObject, domainType, returnType,
-					getCursorPreparer(query, preparer));
+			return template.doFind(template.createDelegate(query), getCollectionName(), queryObject, fieldsObject, domainType,
+					returnType, getCursorPreparer(query, preparer));
 		}
 
 		private List<T> doFindDistinct(String field) {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableInsertOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableInsertOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableMapReduceOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableMapReduceOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableRemoveOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableRemoveOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableUpdateOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ExecutableUpdateOperationSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 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.