polish

Remove unused imports

spring-messaging/src/main/java/org/springframework/messaging/simp/config/MessageBrokerRegistry.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -23,7 +23,6 @@ import org.springframework.messaging.MessageChannel;
 import org.springframework.messaging.SubscribableChannel;
 import org.springframework.messaging.simp.broker.SimpleBrokerMessageHandler;
 import org.springframework.messaging.simp.stomp.StompBrokerRelayMessageHandler;
-import org.springframework.messaging.simp.user.SimpUserRegistry;
 import org.springframework.util.Assert;
 import org.springframework.util.PathMatcher;
 

spring-messaging/src/main/java/org/springframework/messaging/simp/user/UserDestinationMessageHandler.java

@@ -17,7 +17,6 @@
 package org.springframework.messaging.simp.user;
 
 import static org.springframework.messaging.simp.SimpMessageHeaderAccessor.*;
-import static org.springframework.messaging.support.MessageHeaderAccessor.getAccessor;
 
 import java.util.Arrays;
 import java.util.List;

spring-messaging/src/main/java/org/springframework/messaging/tcp/reactor/Reactor2TcpClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -21,7 +21,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Properties;
-import java.util.concurrent.atomic.AtomicBoolean;
 
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.util.concurrent.Future;