Merge branch 'cleanup-3.2.x' into 3.2.x

* cleanup-3.2.x:
  Fix unnecessary @SupressWarnings annotations
  Fix Javadoc warnings
  Fix unused local variable warnings
  Fix unused type compiler warnings
  Fix 'is already an instance of type' warnings

spring-context/src/main/java/org/springframework/context/event/SimpleApplicationEventMulticaster.java

@@ -87,7 +87,6 @@ public class SimpleApplicationEventMulticaster extends AbstractApplicationEventM
 			Executor executor = getTaskExecutor();
 			if (executor != null) {
 				executor.execute(new Runnable() {
-					@SuppressWarnings("unchecked")
 					public void run() {
 						listener.onApplicationEvent(event);
 					}