exception in at javax.swing.SwingGraphics.createSwingGraphics

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jobs239@hotmail.com - 19 Jul 2005 19:41 GMT

I am getting the following exception sometimes in my GUI. How can I
debug this? There is nothing from my code in the stack and the
exception is not easily reproducible. Any help will be greatly
appreciated.

java.lang.Exception: Stack trace
    at java.lang.Thread.dumpStack(Thread.java:1064)
    at
javax.swing.SwingGraphics.createSwingGraphics(SwingGraphics.java:147)
    at javax.swing.JComponent._paintImmediately(JComponent.java:4670)
    at javax.swing.JComponent.paintImmediately(JComponent.java:4488)
    at
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
    at
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
    at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
    at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
    at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
    at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
java.lang.NullPointerException
    at javax.swing.JComponent._paintImmediately(JComponent.java:4671)
    at javax.swing.JComponent.paintImmediately(JComponent.java:4488)
    at
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
    at
javax.swing.SystemEventQueueUtilities$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.pumpEvents(EventDispatchThread.java:145)
    at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
In paintImmediately null graphics

Reply to this Message

Mathias Lichtner - 19 Jul 2005 20:24 GMT

> I am getting the following exception sometimes in my GUI. How can I
> debug this? There is nothing from my code in the stack and the
> exception is not easily reproducible. Any help will be greatly
> appreciated.

[...]

> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
> at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
> at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
> In paintImmediately null graphics

last line, 'In paintImmediately null graphics', perhaps you have
modified your 'Graphics' in an overridden method like paintComponent
or modified it somewhere else?

Reply to this Message

Thomas Fritsch - 20 Jul 2005 01:18 GMT

>I am getting the following exception sometimes in my GUI. How can I
> debug this? There is nothing from my code in the stack and the
[quoted text clipped - 6 lines]
> at javax.swing.JComponent._paintImmediately(JComponent.java:4670)
> ...

Take a look at the source (in "src.zip" of your JDK installation) of
Thread.dumpStack()
/**
* Prints a stack trace of the current thread. This method is used
* only for debugging.
*/
public static void dumpStack() {
new Exception("Stack trace").printStackTrace();
}
You see, that the Exception is *not* thrown. It is just created to print a
stack trace, and the method returns normally. (May be some developer of the
SwingGraphics class has "forgotten" to remove a debugging line
"Thread.dumpStack();" before that JDK version was released.) So there is no
problem at all, and you can safely ignore it.

Of course, in your IDE-debugger you could set a breakpoint on
Thread.dumpStack() to see under which circumstances it happens. But I think
it is not worth the effort.

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exception in at javax.swing.SwingGraphics.createSwingGraphics

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