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Pinned topic action events are not fired in Jre 1.6 whereas working fine in jre5

‏2012-10-11T06:06:23Z |
Hello everybody,
we have migrated from WAS6 to WAS8 and hence it was required to migrate from java5 to 6.
My application is a swing based application.I am encountering a strange problem in jre6, that the swing component like dropdown,textfield are not getting clicked easily. The eventlistener for them is not getting fired and hence the fields are not editable as such. The focus also gets lost very quickly and then i have to use F2 to get it editable.
In the back ground we got the following exception as well.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.ahold.swing.SwingWorkerExecutableTask$
at java.awt.event.InvocationEvent.dispatch(
at java.awt.EventQueue.dispatchEventImpl(
at java.awt.EventQueue.access$000(
at java.awt.EventQueue$
at java.awt.EventQueue$
at sun.misc.JavaSecurityAccessWrapper.doIntersectionPrivilege(
at java.awt.EventQueue.dispatchEvent(
at java.awt.EventDispatchThread.pumpOneEventForFilters(
at java.awt.EventDispatchThread.pumpEventsForFilter(
at java.awt.EventDispatchThread.pumpEventsForHierarchy(
at java.awt.EventDispatchThread.pumpEvents(
at java.awt.EventDispatchThread.pumpEvents(

any pointers on this will be highly appreciable.