Clean up warnings in Gradle build

spring-messaging/src/test/java/org/springframework/messaging/handler/invocation/reactive/MethodMessageHandlerTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.messaging.handler.invocation.reactive;
 
 import java.lang.reflect.Method;
@@ -70,6 +71,7 @@ public class MethodMessageHandlerTests {
 	}
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void bestMatch() throws NoSuchMethodException {
 		TestMethodMessageHandler handler = new TestMethodMessageHandler();
 		TestController controller = new TestController();
@@ -88,6 +90,7 @@ public class MethodMessageHandlerTests {
 	}
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void argumentResolution() {
 
 		ArgumentResolverConfigurer configurer = new ArgumentResolverConfigurer();
@@ -108,6 +111,7 @@ public class MethodMessageHandlerTests {
 	}
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void handleException() {
 
 		TestMethodMessageHandler handler = initMethodMessageHandler(TestController.class);
@@ -150,7 +154,6 @@ public class MethodMessageHandlerTests {
 			return delay("handleMessage");
 		}
 
-		@SuppressWarnings("rawtypes")
 		public Mono<String> handleMessageWithArgument(String payload) {
 			return delay("handleMessageWithArgument,payload=" + payload);
 		}