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Exception in ProgressBar paint action

Posted on 2006-06-15
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Last Modified: 2008-01-09
Could anyone tell me is there a known bug in ProgressBar code in the swing package?

Im getting the following exception

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
      at javax.swing.plaf.basic.BasicProgressBarUI.updateSizes(BasicProgressBarUI.java:428)
      at javax.swing.plaf.basic.BasicProgressBarUI.getBox(BasicProgressBarUI.java:385)
      at com.sun.java.swing.plaf.windows.WindowsProgressBarUI.paintIndeterminate(WindowsProgressBarUI.java:156)
      at javax.swing.plaf.basic.BasicProgressBarUI.paint(BasicProgressBarUI.java:350)
)

If there is, could you give me a link to where it has been reported?

Thanks a mill
mcgettiu
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Question by:mcgettiu
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6 Comments
 
LVL 92

Expert Comment

by:objects
ID: 16916787
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Author Comment

by:mcgettiu
ID: 16918526
Hi objects

I saw that bug alright.....
They had a subclass of JProgressBar that overrides setIndeterminate() and isIndeterminate() - that was the root of the problem there.

I am actually just using JProgressBar so dont think that bug applies to me.

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LVL 92

Expert Comment

by:objects
ID: 16918559
so you're not doing anything exotic?
One thing to check is that you aren't updating the progress bar from a thread other than the event dispatch thread.
If you're not then probleably worth reporting as a bug.
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Author Comment

by:mcgettiu
ID: 16919160
The exception isn't thrown all the time......

If it was the case that the progress bar was being updated by a thread other than the event dispatch thread - I assume the exception would be thrown everytime???
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LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 16919171
not at all, in fact the opposite. Updating the gui from a different thread *will* result in random exceptions.
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LVL 30

Expert Comment

by:Mayank S
ID: 16920216
Yes, you should let the EDT do "its" job :)
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