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-core/src/test/java/org/springframework/core/BridgeMethodResolverTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * 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.
@@ -1048,7 +1048,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public class GenericSqlMapIntegerDao<T extends Integer> extends GenericSqlMapDao<T> {
+	public class GenericSqlMapIntegerDao<T extends Number> extends GenericSqlMapDao<T> {
 
 		@Override
 		public void saveOrUpdate(T t) {