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  ALT key causes an error  (Read 1321 times)
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Archimedes
Guest
« Posted 2003-07-23 08:39:23 »

I got a small Jogl application running with a GLCanvas inside an AWT Frame and some Swing components sitting next to the GLCanvas (no overlapping). There's an Animator class, some java.util.TimerTask classes, etc. The key event listener I registered to the GLCanvas.

Everything works fine. Until you press the ALT key (the left or right one; doesn't matter). Then the following error stack is being reported:

java.lang.NullPointerException
     at javax.swing.SwingUtilities.getWindowAncestor(Unknown Source)
     at com.sun.java.swing.plaf.windows.WindowsRootPaneUI$AltProcessor.postProcessKeyEvent(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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)

Unfortunately I'm no Java/Swing expert (let alone Jogl/OpenGL :-) so don't have any idea what I am doing wrong.

What could I do in order to find the error/bug/... ?
Archimedes
Guest
« Reply #1 - Posted 2003-07-24 05:50:45 »

So actually all your ALT keys do work pretty well when key-listened to an AWT GlCanvas, and the above error just pops up on my silly Win2000 box.
Sigh.

Btw it's the international version of the JRE 1.4.2_X used within Europe, so maybe there's some difference in keyboard handling...?
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