Exception occurred during event dispatching

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jobs239@hotmail.com - 18 Jul 2005 19:31 GMT

I sometimes get the following exception when I bring up my GUI. Line
723 of the code where it originates has the following code.

JOptionPane.showMessageDialog(comp, msg, title, err_type);

I tried putting a try catch statement around this to catch the
arrayoutofbounds exception but it doesn't seem to work. Please help me
debug this problem?

Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: 1
at
javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea(BasicTabbedPaneUI.java:535)
at
javax.swing.plaf.basic.BasicTabbedPaneUI$ScrollableTabPanel.paintComponent(BasicTabbedPaneUI.java:2960)
at javax.swing.JComponent.paint(JComponent.java:808)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JComponent.paint(JComponent.java:817)
at javax.swing.JViewport.paint(JViewport.java:722)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JComponent.paint(JComponent.java:817)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1021)
at javax.swing.JComponent.paint(JComponent.java:817)
at
javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4787)
at
javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4740)
at
javax.swing.JComponent._paintImmediately(JComponent.java:4685)
at
javax.swing.JComponent.paintImmediately(JComponent.java:4488)
at
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
at
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
at java.awt.Dialog$1.run(Dialog.java:540)
at java.awt.Dialog.show(Dialog.java:561)
at
javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:840)
at
javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:642)
at
javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:613)
at myprog.ide.AnUtility$3.run(AnUtility.java:723)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at
java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

Reply to this Message

Thomas Hawtin - 18 Jul 2005 20:39 GMT

> I sometimes get the following exception when I bring up my GUI. Line
> 723 of the code where it originates has the following code.
[quoted text clipped - 10 lines]
> javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea(BasicTabbedPaneUI.java:535)
> [...]

I suggest you look at the source for
javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea and search
bugs.sun.com.

If you still can't figure it out. Try a debugger. Write the smallest
possible example that doesn't work. If it's still unclear post back
here, with complete short example of version number.

FWIW, if it's that simple, I'd guess it's to do with working with Swing
outside of the Event Dispatch Thread (EDT).

Tom Hawtin

Signature

Unemployed English Java programmer

Reply to this Message

Roedy Green - 19 Jul 2005 01:30 GMT

>I suggest you look at the source for
>javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea and search
>bugs.sun.com.

keep in mind the big restriction that Swing is single thread. You
can't call Swing methods directly from other that the Swing thread.

All guarantees are off what will happen if you violate that rule.

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Bush crime family lost/embezzled $3 trillion from Pentagon.
Complicit Bush-friendly media keeps mum. Rumsfeld confesses on video.
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Canadian Mind Products, Roedy Green.
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Reply to this Message

Roedy Green - 19 Jul 2005 01:29 GMT

>I tried putting a try catch statement around this to catch the
>arrayoutofbounds exception but it doesn't seem to work. Please help me
>debug this problem?

Your catch will have to be in the event handler, not the code that
set up the event handler.

Normally you don't catch ArrayBoundsExceptions. You fix the bug
causing them. Catching them just sweeps the dirt under the rug.

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Reply to this Message

Nigel Wade - 20 Jul 2005 10:19 GMT

> I sometimes get the following exception when I bring up my GUI. Line
> 723 of the code where it originates has the following code.
[quoted text clipped - 8 lines]
> java.lang.ArrayIndexOutOfBoundsException: 1
> at

javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea(BasicTabbedPaneUI.java:535)

> at

javax.swing.plaf.basic.BasicTabbedPaneUI$ScrollableTabPanel.paintComponent(BasicTabbedPaneUI.java:2960)

> at javax.swing.JComponent.paint(JComponent.java:808)
> at javax.swing.JComponent.paintChildren(JComponent.java:647)
[quoted text clipped - 16 lines]
> javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
> at

javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)

> at
> java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
> at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
> at

java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)

> at

java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)

> at

java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)

> at java.awt.Dialog$1.run(Dialog.java:540)
> at java.awt.Dialog.show(Dialog.java:561)
[quoted text clipped - 9 lines]
> at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
> at

java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)

> at

java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)

> at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
> at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
> at
> java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

Intermittent Exceptions during GUI initialization can be an indication of
the fact that the GUI is being initialized in the main thread after the EDT
has started realizing it. The Exception is raised because the EDT is
attempting to display a component which is in the process of being modified
by the main thread, or has not been properly initialized yet. The reason
it's intermittent is because it's a race condition.

If this is the case you either need to re-organize the GUI creation so that
nothing is realized until the main thread has completed all its
inialization (and so the EDT is not started), or put the entire
initialization in a separate method and pass off that method to
SwingUtilities.invokeLater() and let the EDT do all the initializtion.

The latter is the preferred method.

See:
http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html#EDT

Signature

Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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Exception occurred during event dispatching

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