Clean up warnings in spring-jms

spring-jms/src/test/java/org/springframework/jms/config/MethodJmsListenerEndpointTests.java

@@ -63,8 +63,6 @@ import org.springframework.validation.annotation.Validated;
 
 import static org.junit.Assert.*;
 import static org.mockito.BDDMockito.*;
-import static org.mockito.BDDMockito.verify;
-import static org.mockito.Mockito.mock;
 
 /**
  * @author Stephane Nicoll

spring-jms/src/test/java/org/springframework/jms/core/JmsTemplateTransactedTests.java

@@ -19,7 +19,6 @@ package org.springframework.jms.core;
 import javax.jms.Session;
 
 import static org.mockito.BDDMockito.*;
-import static org.mockito.Mockito.mock;
 
 /**
  * @author Juergen Hoeller

spring-jms/src/test/java/org/springframework/jms/listener/DefaultMessageListenerContainerTests.java

@@ -87,7 +87,6 @@ public class DefaultMessageListenerContainerTests {
 		verify(execution, times(1)).nextBackOff(); // only on attempt as the second one lead to a recovery
 	}
 
-	@SuppressWarnings("unchecked")
 	private DefaultMessageListenerContainer createContainer(BackOff backOff, ConnectionFactory connectionFactory) {
 
 		Destination destination = new Destination() {};

spring-jms/src/test/java/org/springframework/jms/listener/adapter/MessagingMessageListenerAdapterTests.java

@@ -128,6 +128,7 @@ public class MessagingMessageListenerAdapterTests {
 	}
 
 
+	@SuppressWarnings("unused")
 	private static class SampleBean {
 
 		public Message<String> echo(Message<String> input) {

spring-jms/src/test/java/org/springframework/jms/support/converter/MessagingMessageConverterTests.java

@@ -32,8 +32,6 @@ import org.springframework.messaging.support.MessageBuilder;
 
 import static org.junit.Assert.*;
 import static org.mockito.BDDMockito.*;
-import static org.mockito.BDDMockito.verify;
-import static org.mockito.Mockito.mock;
 
 /**
  *