Changed Future<Void> to Future<?>

Changed return values of Future<Void> to Future<?> in AsyncRestTemplate
and AsyncRestOperations.

spring-web/src/main/java/org/springframework/web/client/AsyncRestOperations.java

@@ -192,57 +192,63 @@ public interface AsyncRestOperations {
 	/**
 	 * Create or update a resource by PUTting the given object to the URI.
 	 * <p>URI Template variables are expanded using the given URI variables, if any.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 * @param request the Object to be PUT, may be {@code null}
 	 * @param uriVariables the variables to expand the template
 	 * @see HttpEntity
 	 */
-	Future<Void> put(String url, HttpEntity<?> request, Object... uriVariables)
+	Future<?> put(String url, HttpEntity<?> request, Object... uriVariables)
 			throws RestClientException;
 
 	/**
 	 * Creates a new resource by PUTting the given object to URI template.
 	 * <p>URI Template variables are expanded using the given map.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 * @param request the Object to be PUT, may be {@code null}
 	 * @param uriVariables the variables to expand the template
 	 * @see HttpEntity
 	 */
-	Future<Void> put(String url, HttpEntity<?> request, Map<String, ?> uriVariables)
+	Future<?> put(String url, HttpEntity<?> request, Map<String, ?> uriVariables)
 			throws RestClientException;
 
 	/**
 	 * Creates a new resource by PUTting the given object to URL.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 * @param request the Object to be PUT, may be {@code null}
 	 * @see HttpEntity
 	 */
-	Future<Void> put(URI url, HttpEntity<?> request) throws RestClientException;
+	Future<?> put(URI url, HttpEntity<?> request) throws RestClientException;
 
 	// DELETE
 
 	/**
 	 * Asynchronously delete the resources at the specified URI.
 	 * <p>URI Template variables are expanded using the given URI variables, if any.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 * @param uriVariables the variables to expand in the template
 	 */
-	Future<Void> delete(String url, Object... uriVariables) throws RestClientException;
+	Future<?> delete(String url, Object... uriVariables) throws RestClientException;
 
 	/**
 	 * Asynchronously delete the resources at the specified URI.
 	 * <p>URI Template variables are expanded using the given URI variables, if any.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 * @param uriVariables the variables to expand in the template
 	 */
-	Future<Void> delete(String url, Map<String, ?> uriVariables) throws RestClientException;
+	Future<?> delete(String url, Map<String, ?> uriVariables) throws RestClientException;
 
 	/**
 	 * Asynchronously delete the resources at the specified URI.
 	 * <p>URI Template variables are expanded using the given URI variables, if any.
+	 * <p>The Future will return a {@code null} result upon completion.
 	 * @param url the URL
 	 */
-	Future<Void> delete(URI url) throws RestClientException;
+	Future<?> delete(URI url) throws RestClientException;
 
 	// OPTIONS
 

spring-web/src/main/java/org/springframework/web/client/AsyncRestTemplate.java

@@ -304,21 +304,21 @@ public class AsyncRestTemplate extends AsyncHttpAccessor implements AsyncRestOpe
 	// PUT
 
 	@Override
-	public Future<Void> put(String url, HttpEntity<?> request, Object... uriVariables)
+	public Future<?> put(String url, HttpEntity<?> request, Object... uriVariables)
 			throws RestClientException {
 		AsyncRequestCallback requestCallback = httpEntityCallback(request);
 		return execute(url, HttpMethod.PUT, requestCallback, null, uriVariables);
 	}
 
 	@Override
-	public Future<Void> put(String url, HttpEntity<?> request,
+	public Future<?> put(String url, HttpEntity<?> request,
 			Map<String, ?> uriVariables) throws RestClientException {
 		AsyncRequestCallback requestCallback = httpEntityCallback(request);
 		return execute(url, HttpMethod.PUT, requestCallback, null, uriVariables);
 	}
 
 	@Override
-	public Future<Void> put(URI url, HttpEntity<?> request) throws RestClientException {
+	public Future<?> put(URI url, HttpEntity<?> request) throws RestClientException {
 		AsyncRequestCallback requestCallback = httpEntityCallback(request);
 		return execute(url, HttpMethod.PUT, requestCallback, null);
 	}
@@ -326,19 +326,19 @@ public class AsyncRestTemplate extends AsyncHttpAccessor implements AsyncRestOpe
 	// DELETE
 
 	@Override
-	public Future<Void> delete(String url, Object... urlVariables)
+	public Future<?> delete(String url, Object... urlVariables)
 			throws RestClientException {
 		return execute(url, HttpMethod.DELETE, null, null, urlVariables);
 	}
 
 	@Override
-	public Future<Void> delete(String url, Map<String, ?> urlVariables)
+	public Future<?> delete(String url, Map<String, ?> urlVariables)
 			throws RestClientException {
 		return execute(url, HttpMethod.DELETE, null, null, urlVariables);
 	}
 
 	@Override
-	public Future<Void> delete(URI url) throws RestClientException {
+	public Future<?> delete(URI url) throws RestClientException {
 		return execute(url, HttpMethod.DELETE, null, null);
 	}
 

spring-web/src/test/java/org/springframework/web/client/AsyncRestTemplateIntegrationTests.java

@@ -149,7 +149,7 @@ public class AsyncRestTemplateIntegrationTests extends AbstractJettyServerTestCa
 	public void put()
 			throws URISyntaxException, ExecutionException, InterruptedException {
 		HttpEntity<String> requestEntity = new HttpEntity<>(helloWorld);
-		Future<Void>
+		Future<?>
 				responseEntityFuture = template.put(baseUrl + "/{method}", requestEntity,
 				"put");
 		responseEntityFuture.get();
@@ -158,7 +158,7 @@ public class AsyncRestTemplateIntegrationTests extends AbstractJettyServerTestCa
 	@Test
 	public void delete()
 			throws URISyntaxException, ExecutionException, InterruptedException {
-		Future<Void> deletedFuture = template.delete(new URI(baseUrl + "/delete"));
+		Future<?> deletedFuture = template.delete(new URI(baseUrl + "/delete"));
 		deletedFuture.get();
 	}