--- old/src/share/classes/sun/awt/UngrabEvent.java	2011-12-02 17:47:20.897915900 +0400
+++ new/src/share/classes/sun/awt/UngrabEvent.java	2011-12-02 17:47:19.870857100 +0400
@@ -39,7 +39,9 @@
  * <p>Notice that this event is not generated on mouse click inside of the window area.
  * <p>To listen for this event, install AWTEventListener with {@value sun.awt.SunToolkit#GRAB_EVENT_MASK}
  */
+@SuppressWarnings("serial")
 public class UngrabEvent extends AWTEvent {
+
     private final static int UNGRAB_EVENT_ID = 1998;
 
     public UngrabEvent(Component source) {