Remove unused imports

spring-messaging/src/main/java/org/springframework/messaging/core/AbstractMessagingTemplate.java

@@ -19,8 +19,6 @@ package org.springframework.messaging.core;
 import java.util.Map;
 
 import org.springframework.messaging.Message;
-import org.springframework.messaging.MessageHeaders;
-import org.springframework.messaging.converter.MessageConversionException;
 
 /**
  * An extension of {@link AbstractMessageReceivingTemplate} that adds support for

spring-messaging/src/main/java/org/springframework/messaging/handler/DestinationPatternsMessageCondition.java

@@ -21,7 +21,6 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
-import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;

spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/SendToUser.java

@@ -22,9 +22,6 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-import org.springframework.messaging.Message;
-import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
-
 /**
  * Annotation that indicates the return value of a message-handling method should
  * be sent as a {@link org.springframework.messaging.Message} to the specified

spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/SendToMethodReturnValueHandler.java

@@ -32,7 +32,6 @@ import org.springframework.messaging.simp.user.DestinationUserNameProvider;
 import org.springframework.messaging.support.MessageHeaderInitializer;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
-import org.springframework.util.StringUtils;
 
 import java.lang.annotation.Annotation;
 import java.security.Principal;

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

@@ -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.util.AntPathMatcher;
 import org.springframework.util.Assert;
 import org.springframework.util.PathMatcher;
 

spring-messaging/src/test/java/org/springframework/messaging/simp/SimpSessionScopeTests.java

@@ -20,10 +20,9 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mockito;
-import org.springframework.beans.BeansException;
+
 import org.springframework.beans.factory.ObjectFactory;
 
-import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import static org.junit.Assert.assertThat;

spring-messaging/src/test/java/org/springframework/messaging/simp/config/MessageBrokerConfigurationTests.java

@@ -27,7 +27,7 @@ import org.junit.Before;
 import org.junit.Test;
 
 import org.mockito.Mockito;
-import org.springframework.beans.DirectFieldAccessor;
+
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;

spring-messaging/src/test/java/org/springframework/messaging/simp/stomp/StompHeaderAccessorTests.java

@@ -32,7 +32,6 @@ import org.springframework.messaging.support.MessageBuilder;
 import org.springframework.messaging.support.MessageHeaderAccessor;
 import org.springframework.util.AlternativeJdkIdGenerator;
 import org.springframework.util.LinkedMultiValueMap;
-import org.springframework.util.MimeType;
 import org.springframework.util.MimeTypeUtils;
 import org.springframework.util.MultiValueMap;
 

spring-messaging/src/test/java/org/springframework/messaging/support/MessageHeaderAccessorTests.java

@@ -23,7 +23,6 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.UUID;
 
-import org.hamcrest.CoreMatchers;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;