Hello Roman,
here are two more NPEs resulting from JTree repainting. I got these
while running a slide-show in Niffler under rather high system load
(heap memory almost exhausted, nominal 30 msec pause between images,
both tree and image canvas visible). Classpath cvs 2006.10.20 with
jamvm on Linux x86.
This might well be a result of the high system load with lots of
garbage-collection. Still, it shouldn't happen, and might be worth
checking:
Exception during event dispatch:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTreeUI.isLastChild(BasicTreeUI.java:1623)
at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1572)
at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:248)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:193)
at javax.swing.JComponent.paintComponent(JComponent.java:2069)
at javax.swing.JComponent.paint(JComponent.java:1834)
at javax.swing.JViewport.paintSimple(JViewport.java:794)
at javax.swing.JViewport.paintBackingStore(JViewport.java:850)
at javax.swing.JViewport.paint(JViewport.java:495)
at javax.swing.JComponent.paintChildren(JComponent.java:1969)
at javax.swing.JComponent.paint(JComponent.java:1837)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:2349)
at javax.swing.JComponent.paintImmediately2(JComponent.java:2266)
at javax.swing.JComponent.paintImmediately(JComponent.java:2105)
at javax.swing.JComponent.paintImmediately(JComponent.java:2131)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:594)
at javax.swing.RepaintManager$RepaintWorker.run(RepaintManager.java:170)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:200)
at
javax.swing.RepaintManager$RepaintWorkerEvent.dispatch(RepaintManager.java:114)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:609)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
Exception during event dispatch:
java.lang.NullPointerException
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:2332)
at javax.swing.JComponent.paint(JComponent.java:1794)
at
javax.swing.tree.DefaultTreeCellRenderer.paint(DefaultTreeCellRenderer.java:532)
at javax.swing.CellRendererPane.paintComponent(CellRendererPane.java:189)
at javax.swing.CellRendererPane.paintComponent(CellRendererPane.java:219)
at javax.swing.CellRendererPane.paintComponent(CellRendererPane.java:237)
at javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:3892)
at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1603)
at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:248)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:193)
at javax.swing.JComponent.paintComponent(JComponent.java:2069)
at javax.swing.JComponent.paint(JComponent.java:1834)
at javax.swing.JViewport.paintSimple(JViewport.java:794)
at javax.swing.JViewport.paintBackingStore(JViewport.java:861)
at javax.swing.JViewport.paint(JViewport.java:495)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:2349)
at javax.swing.JComponent.paintImmediately2(JComponent.java:2266)
at javax.swing.JComponent.paintImmediately(JComponent.java:2105)
at javax.swing.JComponent.paintImmediately(JComponent.java:2131)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:594)
at javax.swing.RepaintManager$RepaintWorker.run(RepaintManager.java:170)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:200)
at
javax.swing.RepaintManager$RepaintWorkerEvent.dispatch(RepaintManager.java:114)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:609)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
--
Summary: NPEs from JTree repainting
Product: classpath
Version: 0.93
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: swing
AssignedTo: roman at kennke dot org
ReportedBy: hendrich at informatik dot uni-hamburg dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29566
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