Decouple Paging and Sorting repositories from CrudRepository.

This way they can be combined with different variants of CrudRepositories.

This affects
`PagingAndSortingRepository`, `ReactiveSortingRepository`, `CoroutineSortingRepository`, and `RxJavaSortingRepository`.

Any repository implementing those interfaces now needs to also implement a suitable CRUD repository, or needs to manually add the methods from a CRUD repository as needed.

Closes #2537
Original pull request: #2540.

src/main/java/org/springframework/data/repository/PagingAndSortingRepository.java

@@ -20,16 +20,19 @@ import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
 
 /**
- * Extension of {@link CrudRepository} to provide additional methods to retrieve entities using the pagination and
- * sorting abstraction.
+ * Repository fragment to provide methods to retrieve entities using the pagination and sorting abstraction. In many
+ * cases this will be combined with {@link CrudRepository} or similar or with manually added methods to provide CRUD
+ * functionality.
  *
  * @author Oliver Gierke
+ * @author Jens Schauder
  * @see Sort
  * @see Pageable
  * @see Page
+ * @see CrudRepository
  */
 @NoRepositoryBean
-public interface PagingAndSortingRepository<T, ID> extends CrudRepository<T, ID> {
+public interface PagingAndSortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/reactive/ReactiveSortingRepository.java

@@ -20,20 +20,24 @@ import reactor.core.publisher.Mono;
 
 import org.springframework.data.domain.Sort;
 import org.springframework.data.repository.NoRepositoryBean;
+import org.springframework.data.repository.Repository;
 
 /**
- * Extension of {@link ReactiveCrudRepository} to provide additional methods to retrieve entities using the sorting
- * abstraction.
+ * Repository fragment to provide methods to retrieve entities using the sorting abstraction. In many cases it
+ * should be combined with {@link ReactiveCrudRepository} or a similar repository interface in order to add CRUD
+ * functionality.
  *
  * @author Mark Paluch
  * @author Christoph Strobl
+ * @author Jens Schauder
  * @since 2.0
  * @see Sort
  * @see Mono
  * @see Flux
+ * @see ReactiveCrudRepository
  */
 @NoRepositoryBean
-public interface ReactiveSortingRepository<T, ID> extends ReactiveCrudRepository<T, ID> {
+public interface ReactiveSortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/reactive/RxJava3SortingRepository.java

@@ -19,18 +19,21 @@ import io.reactivex.rxjava3.core.Flowable;
 
 import org.springframework.data.domain.Sort;
 import org.springframework.data.repository.NoRepositoryBean;
+import org.springframework.data.repository.Repository;
 
 /**
- * Extension of {@link RxJava3CrudRepository} to provide additional methods to retrieve entities using the sorting
- * abstraction.
- *
+ * Repository fragment to provide methods to retrieve entities using the sorting abstraction. In many cases this
+ * should be combined with {@link RxJava3CrudRepository} or a similar interface to provide CRUD functionality.
+ * 
  * @author Mark Paluch
+ * @author Jens Schauder
  * @since 2.4
  * @see Sort
  * @see Flowable
+ * @see RxJava3CrudRepository
  */
 @NoRepositoryBean
-public interface RxJava3SortingRepository<T, ID> extends RxJava3CrudRepository<T, ID> {
+public interface RxJava3SortingRepository<T, ID> extends Repository<T, ID> {
 
 	/**
 	 * Returns all entities sorted by the given options.

src/main/java/org/springframework/data/repository/support/DefaultRepositoryInvokerFactory.java

@@ -35,6 +35,7 @@ import org.springframework.util.Assert;
  *
  * @author Oliver Gierke
  * @author Christoph Strobl
+ * @author Jens Schauder
  * @since 1.10
  */
 public class DefaultRepositoryInvokerFactory implements RepositoryInvokerFactory {
@@ -93,7 +94,7 @@ public class DefaultRepositoryInvokerFactory implements RepositoryInvokerFactory
 	@SuppressWarnings("unchecked")
 	protected RepositoryInvoker createInvoker(RepositoryInformation information, Object repository) {
 
-		if (repository instanceof PagingAndSortingRepository) {
+		if (repository instanceof PagingAndSortingRepository && repository instanceof CrudRepository) {
 			return new PagingAndSortingRepositoryInvoker((PagingAndSortingRepository<Object, Object>) repository, information,
 					conversionService);
 		} else if (repository instanceof CrudRepository) {

src/main/java/org/springframework/data/repository/support/PagingAndSortingRepositoryInvoker.java

@@ -21,6 +21,7 @@ import java.util.Optional;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
+import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.PagingAndSortingRepository;
 import org.springframework.data.repository.core.RepositoryMetadata;
 
@@ -29,6 +30,7 @@ import org.springframework.data.repository.core.RepositoryMetadata;
  * avoid reflection overhead introduced by the superclass.
  *
  * @author Oliver Gierke
+ * @author Jens Schauder
  * @since 1.10
  */
 class PagingAndSortingRepositoryInvoker extends CrudRepositoryInvoker {
@@ -47,7 +49,7 @@ class PagingAndSortingRepositoryInvoker extends CrudRepositoryInvoker {
 	public PagingAndSortingRepositoryInvoker(PagingAndSortingRepository<Object, Object> repository,
 			RepositoryMetadata metadata, ConversionService conversionService) {
 
-		super(repository, metadata, conversionService);
+		super((CrudRepository<Object, Object>) repository, metadata, conversionService);
 
 		var crudMethods = metadata.getCrudMethods();