Bug 29566 - NPEs from JTree repainting
Summary: NPEs from JTree repainting
Status: ASSIGNED
Alias: None
Product: classpath
Classification: Unclassified
Component: swing (show other bugs)
Version: 0.93
: P3 normal
Target Milestone: ---
Assignee: Roman Kennke
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-10-23 17:05 UTC by Norman Hendrich
Modified: 2006-10-23 17:18 UTC (History)
1 user (show)

See Also:
Host:
Target:
Build:
Known to work:
Known to fail:
Last reconfirmed: 2006-10-23 17:18:16

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Description Norman Hendrich 2006-10-23 17:05:44 UTC 
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)
Comment 1 Roman Kennke 2006-10-23 17:18:16 UTC 
Yeah, these are similar to the NPEs that we have seen in JTree lately. I'll look at those and fix them.