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() );
scrollPane.getVerticalScrollBar().setValue(scrollPane
.getVerticalScrollBar().getMaximum());
}
textArea.invalidate();
}
And here is a sample of the exception.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
javax.swing.BufferStrategyPaintManager.flushAccumulatedRegion(BufferStrategyPaintManager.java:406)
at
javax.swing.BufferStrategyPaintManager.endPaint(BufferStrategyPaintManager.java:370)
at javax.swing.RepaintManager.endPaint(RepaintManager.java:1192)
at javax.swing.JComponent._paintImmediately(JComponent.java:5076)
at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
at
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:723) at
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679) at
javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
at
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at
java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
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