DATACMNS-988 - Fix Publisher to RxJava 2 conversion.

And fix some issues in JavaDoc.

Original Pull Request: #194

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

@@ -91,7 +91,7 @@ public interface ReactiveCrudRepository<T, ID extends Serializable> extends Repo
 	Mono<Boolean> exists(ID id);
 
 	/**
-	 * Returns whether an entity with the given id exists supplied by a {@link Mono}.
+	 * Returns whether an entity with the given id, supplied by a {@link Mono}, exists.
 	 *
 	 * @param id must not be {@literal null}.
 	 * @return {@literal true} if an entity with the given id exists, {@literal false} otherwise

src/main/java/org/springframework/data/repository/reactive/RxJava1CrudRepository.java

@@ -91,7 +91,7 @@ public interface RxJava1CrudRepository<T, ID extends Serializable> extends Repos
 	Single<Boolean> exists(ID id);
 
 	/**
-	 * Returns whether an entity with the given id exists supplied by a {@link Single}.
+	 * Returns whether an entity with the given id, supplied by a {@link Single}, exists.
 	 *
 	 * @param id must not be {@literal null}.
 	 * @return {@literal true} if an entity with the given id exists, {@literal false} otherwise.

src/main/java/org/springframework/data/repository/reactive/RxJava2CrudRepository.java

@@ -31,6 +31,7 @@ import org.springframework.data.repository.Repository;
  *
  * @author Mark Paluch
  * @since 2.0
+ * @see Maybe
  * @see Single
  * @see Flowable
  * @see Completable
@@ -93,7 +94,7 @@ public interface RxJava2CrudRepository<T, ID extends Serializable> extends Repos
 	Single<Boolean> exists(ID id);
 
 	/**
-	 * Returns whether an entity with the given id exists supplied by a {@link Single}.
+	 * Returns whether an entity with the given id, supplied by a {@link Single}, exists.
 	 *
 	 * @param id must not be {@literal null}.
 	 * @return {@literal true} if an entity with the given id exists, {@literal false} otherwise.

src/main/java/org/springframework/data/repository/util/ReactiveWrapperConverters.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 the original author or authors.
+ * Copyright 2016-2017 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.
@@ -722,7 +722,7 @@ public class ReactiveWrapperConverters {
 
 		@Override
 		public io.reactivex.Observable<?> convert(Publisher<?> source) {
-			return (io.reactivex.Observable<?>) REACTIVE_ADAPTER_REGISTRY.getAdapter(io.reactivex.Single.class)
+			return (io.reactivex.Observable<?>) REACTIVE_ADAPTER_REGISTRY.getAdapter(io.reactivex.Observable.class)
 					.fromPublisher(source);
 		}
 	}

src/test/java/org/springframework/data/repository/util/ReactiveWrapperConvertersUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 the original author or authors.
+ * Copyright 2016-2017 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.
@@ -175,6 +175,22 @@ public class ReactiveWrapperConvertersUnitTests {
 		assertThat(ReactiveWrapperConverters.toWrapper(foo, Publisher.class)).isInstanceOf(Publisher.class);
 	}
 
+	@Test // DATACMNS-988
+	public void toWrapperShouldConvertPublisherToRxJava2Observable() {
+
+		Flux<String> foo = Flux.just("foo");
+		assertThat(ReactiveWrapperConverters.toWrapper(foo, io.reactivex.Observable.class))
+				.isInstanceOf(io.reactivex.Observable.class);
+	}
+
+	@Test // DATACMNS-988
+	public void toWrapperShouldConvertPublisherToRxJava2Flowable() {
+
+		Flux<String> foo = Flux.just("foo");
+		assertThat(ReactiveWrapperConverters.toWrapper(foo, io.reactivex.Flowable.class))
+				.isInstanceOf(io.reactivex.Flowable.class);
+	}
+
 	@Test // DATACMNS-836
 	public void toWrapperShouldConvertMonoToFlux() {