Hi David,
[email protected] wrote:
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 .
Typically issues like this are caused by doing something Swing-related
off the EDT. Make absolutely sure you aren't doing something like that.
For example, in the quoted email I don't see scrollToEnd() in
the stack trace which may be an indicator that it's
being called from a wrong thread.
Thanks,
Dmitri
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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