Fix Checkstyle violations

spring-integration-core/src/main/java/org/springframework/integration/endpoint/ReactiveConsumer.java

@@ -139,7 +139,7 @@ public class ReactiveConsumer extends AbstractEndpoint {
 	}
 
 
-	private static class SubscribableChannelPublisherAdapter
+	private final static class SubscribableChannelPublisherAdapter
 			implements Publisher<Message<?>>, Subscriber<Message<?>>, Subscription {
 
 		private final DirectProcessor<Message<?>> delegate = DirectProcessor.create();

spring-integration-core/src/main/java/org/springframework/integration/handler/AbstractMessageHandler.java

@@ -168,7 +168,7 @@ public abstract class AbstractMessageHandler extends IntegrationObjectSupport im
 
 	@Override
 	public void onComplete() {
-		System.out.println("onComplete()");
+
 	}
 
 	protected abstract void handleMessageInternal(Message<?> message) throws Exception;