IllegalArgumentException: null source

[Steve Wardell]

I'm getting the following exception when using some Java applets with Firefox 1.0.6 on a 10.3 OSX machine. I've had it happen several times thou occassionally it doesn't seem to happen. Anyone seen this / any ideas? I'm using the current version of the java plugin.

java.lang.IllegalArgumentException: null source

at java.util.EventObject.<init>(EventObject.java:34)

at java.awt.AWTEvent.<init>(AWTEvent.java:226)

at java.awt.event.ComponentEvent.<init>(ComponentEvent.java:94)

at java.awt.event.WindowEvent.<init>(WindowEvent.java:174)

at java.awt.event.WindowEvent.<init>(WindowEvent.java:211)

at
java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusM
anager.java:576)

at java.awt.Component.dispatchEventImpl(Component.java:3572)

at java.awt.Container.dispatchEventImpl(Container.java:1671)

at java.awt.Window.dispatchEventImpl(Window.java:1606)

at java.awt.Component.dispatchEvent(Component.java:3543)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)

at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThrea
d.java:234)

at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.
java:184)

at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)

at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:170)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

Thanks,
Steve

[Steven Michaud]

I also see this error occasionally.  I've never seen it cause any
trouble, though.  When you see it by itself (not accompanied by other
errors), it may be entirely benign.

(I assume the error occurs when an AWTEvent object's getSource()
method returns NULL.  It seems that this isn't (usually) a fatal error
condition.)