AWT EventQueue NullPointerException

[alvinsim]

Hi all,

I have a signed applet which writes text files to a specified directory in a client workstation.

When I load the applet in a web browser for the first time, there was no problem. But when I continue to load it again, it just won't load. All we see is the Java loading image. Even after waiting for 10 minutes, the applet still won't load.

Unfortunately, this doesn't happen all the time. I've tried closing the web browser and clearing all its caches and temp files but sometimes it will occur again.

The client workstation has JRE 1.6.0_16 installed.

Below is the Stack Trace from the Java Console.

basic: Loading Java Applet ...
basic: Applet initialized
basic: Removed progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@59a34
basic: Applet made visible
basic: Starting applet
basic: completed perf rollup
basic: Applet started
basic: Told clients applet is started
Exception in thread "AWT-EventQueue-6" java.lang.NullPointerException
	at java.awt.LightweightDispatcher$3.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-6" java.lang.NullPointerException
	at java.awt.LightweightDispatcher$3.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-6" java.lang.NullPointerException
	at java.awt.LightweightDispatcher$3.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[Webuser]

Could you provide us its problem code parts :( ?