JDK6 SwingUtilities NullPointerException when user try to open Popup Window

When user clicks first time, the popup menu displayed without any error. User clicks again approx. 4-6 times to open the same popup screen and the popup menu will be displayed with the NullPointerException error. After NullPointerException user is not able to clikc on any button. Swing GUI is hanging & not recognizing the event selected by user in GUI Window and failing with the error NullPointerException.
JVM Version (Tested with the Latest JDK version):-
jdk1.6.0_35
jdk1.6.0_37
Code:-
( (JPopupMenu)popupMenuView ).show( JTree, location.x, location.y );
Error:-
java.lang.NullPointerException
at javax.swing.SwingUtilities.getWindowAncestor(SwingUtilities.java:120)
at javax.swing.Popup.dispose(Popup.java:113)
at javax.swing.Popup.hide(Popup.java:105)
at javax.swing.ToolTipManager.hideTipWindow(ToolTipManager.java:322)
at javax.swing.ToolTipManager.mouseExited(ToolTipManager.java:555)
at java.awt.AWTEventMulticaster.mouseExited(AWTEventMulticaster.java:293)
at java.awt.AWTEventMulticaster.mouseExited(AWTEventMulticaster.java:292)
at java.awt.Component.processMouseEvent(Component.java:6303)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4356)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4218)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:641)
at java.awt.EventQueue$3.run(EventQueue.java:639)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Sounds like s concurrency issue. does your code respect Swing's single threaded rule?
http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html
db

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