Fix several miscellaneous compiler/Eclipse warnings

- Suppress an (intentional) AspectJ warning
 - Remove unused imports
 - Suppress a [hiding] warning
 - Fix a generics warning related to extension of final types

Issue: SPR-9431

spring-context/src/test/java/org/springframework/context/annotation/AnnotationProcessorPerformanceTests.java

@@ -17,7 +17,6 @@
 package org.springframework.context.annotation;
 
 import static org.junit.Assert.*;
-import static org.junit.Assume.assumeFalse;
 
 import javax.annotation.Resource;
 

spring-context/src/test/java/org/springframework/context/annotation/BeanMethodPolymorphismTests.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2002-2013 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.context.annotation;
 
 import static org.hamcrest.CoreMatchers.equalTo;
@@ -31,7 +47,7 @@ public class BeanMethodPolymorphismTests {
 
 	@Test
 	public void beanMethodOverloadingWithoutInheritance() {
-		@SuppressWarnings("unused")
+		@SuppressWarnings({ "unused", "hiding" })
 		@Configuration class Config {
 			@Bean String aString() { return "na"; }
 			@Bean String aString(Integer dependency) { return "na"; }

spring-context/src/test/java/org/springframework/scheduling/concurrent/ScheduledExecutorFactoryBeanTests.java

@@ -28,7 +28,6 @@ import org.springframework.tests.TestGroup;
 
 import static org.junit.Assert.*;
 import static org.mockito.BDDMockito.*;
-import static org.mockito.Mockito.*;
 
 /**
  * @author Rick Evans