Fix outdated Javadoc.

Closes #2860

src/main/java/org/springframework/data/web/PageableArgumentResolver.java

@@ -28,8 +28,7 @@
 /**
  * Argument resolver to extract a {@link Pageable} object from a {@link NativeWebRequest} for a particular
  * {@link MethodParameter}. A {@link PageableArgumentResolver} can either resolve {@link Pageable} itself or wrap
- * another {@link PageableArgumentResolver} to post-process {@link Pageable}. {@link Pageable} resolution yields either
- * in a {@link Pageable} object or {@literal null} if {@link Pageable} cannot be resolved.
+ * another {@link PageableArgumentResolver} to post-process {@link Pageable}.
  *
  * @author Mark Paluch
  * @since 1.13

src/main/java/org/springframework/data/web/SortArgumentResolver.java

@@ -28,8 +28,7 @@
 /**
  * Argument resolver to extract a {@link Sort} object from a {@link NativeWebRequest} for a particular
  * {@link MethodParameter}. A {@link SortArgumentResolver} can either resolve {@link Sort} itself or wrap another
- * {@link SortArgumentResolver} to post-process {@link Sort}. {@link Sort} resolution yields either in a {@link Sort}
- * object or {@literal null} if {@link Sort} cannot be resolved.
+ * {@link SortArgumentResolver} to post-process {@link Sort}.
  *
  * @author Mark Paluch
  * @since 1.13
@@ -45,7 +44,7 @@ public interface SortArgumentResolver extends HandlerMethodArgumentResolver {
 	 * @param mavContainer the ModelAndViewContainer for the current request
 	 * @param webRequest the current request
 	 * @param binderFactory a factory for creating {@link WebDataBinder} instances
-	 * @return the resolved argument value, or {@code null}
+	 * @return the resolved argument value
 	 */
 	@NonNull
 	@Override

src/test/java/org/springframework/data/web/PageableHandlerMethodArgumentResolverUnitTests.java

@@ -149,7 +149,7 @@ void sizeParamIsNotNumeric() throws Exception {
 	}
 
 	@Test // DATACMNS-477
-	void returnsNullIfFallbackIsUnpagedAndNoParametersGiven() throws Exception {
+	void returnsUnpagedIfFallbackIsUnpagedAndNoParametersGiven() throws Exception {
 
 		var resolver = getResolver();
 		resolver.setFallbackPageable(Pageable.unpaged());

src/test/java/org/springframework/data/web/ReactivePageableHandlerMethodArgumentResolverUnitTests.java

@@ -132,7 +132,7 @@ void sizeParamIsNotNumeric() {
 	}
 
 	@Test // DATACMNS-1211
-	void returnsNullIfFallbackIsUnpagedAndNoParametersGiven() {
+	void returnsUnpagedIfFallbackIsUnpagedAndNoParametersGiven() {
 
 		var resolver = getReactiveResolver();
 		resolver.setFallbackPageable(Pageable.unpaged());

src/test/java/org/springframework/data/web/ReactiveSortHandlerMethodArgumentResolverUnitTests.java

@@ -55,7 +55,7 @@ void supportsSortParameter() {
 	}
 
 	@Test // DATACMNS-1211
-	void returnsNullForNoDefault() {
+	void returnsUnsortedForNoDefault() {
 		assertSupportedAndResolvedTo(getParameterOfMethod("supportedMethod"), Sort.unsorted());
 	}
 

src/test/java/org/springframework/data/web/SortDefaultUnitTests.java

@@ -69,7 +69,7 @@ void supportsSortParameter() {
 	}
 
 	@Test
-	void returnsNullForNoDefault() throws Exception {
+	void returnsUnsortedForNoDefault() throws Exception {
 		assertSupportedAndResolvedTo(getParameterOfMethod("supportedMethod"), Sort.unsorted());
 	}
 

src/test/java/org/springframework/data/web/SortHandlerMethodArgumentResolverUnitTests.java

@@ -107,7 +107,7 @@ void discoversQualifiedSortFromRequest() {
 	}
 
 	@Test
-	void returnsNullForSortParameterSetToNothing() {
+	void returnsUnsortedForSortParameterSetToNothing() {
 
 		var parameter = getParameterOfMethod("supportedMethod");