Hi,
Did you receive any useful replies to your query?
I am having exactly the same problem. It is an application that is written with
Swing and was recently migrated from Java 1.4 to Java 1.6 .
David
> I am getting random, not repeatable NPE's in at
> javax.swing.BufferStrategyPaintManager.prepare. I
> believe they are being caused by trying to scroll to
> the end of a textArea in a scrollPane. These NPE's
> only seem to be happening on dual core machines on
> either Windows or Linux. I believe the following
> code is the culprit but can't prove it. i'm running
> different minor updates to Java 6.
>
> protected final void scrollToEnd() {
> if ( textArea instanceof JTextArea ) {
> ((JTextArea)textArea).setCaretPosition( (
> (JTextComponent) textArea )
>
> getDocument().getLength() );
>
> crollPane.getVerticalScrollBar().setValue(scrollPane
>
> getVerticalScrollBar().getMaximum());
> }
> textArea.invalidate();
> }
> nd here is a sample of the exception.
>
> Exception in thread "AWT-EventQueue-0"
> java.lang.NullPointerException
> at
> ing.BufferStrategyPaintManager.flushAccumulatedRegion(
> BufferStrategyPaintManager.java:406)
> at
> ing.BufferStrategyPaintManager.endPaint(BufferStrategy
> PaintManager.java:370)
> at
> javax.swing.RepaintManager.endPaint(RepaintManager.jav
> a:1192)
> at
> javax.swing.JComponent._paintImmediately(JComponent.ja
> va:5076)
> at
> javax.swing.JComponent.paintImmediately(JComponent.jav
> a:4880)
> at
> ing.RepaintManager.paintDirtyRegions(RepaintManager.ja
> va:723) at
> javax.swing.RepaintManager.paintDirtyRegions(RepaintMa
> nager.java:679) at
> javax.swing.RepaintManager.seqPaintDirtyRegions(Repain
> tManager.java:659)
> at
> ing.SystemEventQueueUtilities$ComponentWorkRequest.run
> (SystemEventQueueUtilities.java:128)
> at
> java.awt.event.InvocationEvent.dispatch(InvocationEven
> t.java:209)
> at
> java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
>
> at
> .EventDispatchThread.pumpOneEventForFilters(EventDispa
> tchThread.java:273)
> at
> .EventDispatchThread.pumpEventsForFilter(EventDispatch
> Thread.java:183)
> at
> .EventDispatchThread.pumpEventsForHierarchy(EventDispa
> tchThread.java:173)
> at
> .EventDispatchThread.pumpEvents(EventDispatchThread.ja
> va:168) at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchT
> hread.java:160) at
> java.awt.EventDispatchThread.run(EventDispatchThread.j
> ava:121)
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