Description Matthias Zimmermann 2011-05-05 04:12:45 EDT

PROBLEM DESCRIPTION:
Occasionally, we get a NullPointerException in AbstractTable. Unfortunately, the exception is not reproducable reliably, but we see the problem mostly while quickly switching between different tree nodes or typing text very fast.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
  at org.eclipse.scout.rt.client.ui.basic.table.AbstractTable.getFilteredRows(AbstractTable.java:1478)
  at org.eclipse.scout.rt.client.ui.basic.table.AbstractTable.getFilteredRowCount(AbstractTable.java:1498)
  at org.eclipse.scout.rt.ui.swing.basic.table.SwingTableModel.getRowCount(SwingTableModel.java:41)
  at javax.swing.JTable.getRowCount(JTable.java:2640)
  at javax.swing.JTable.getCellRect(JTable.java:2910)
  at org.eclipse.scout.rt.ui.swing.ext.JTableEx.getCellRect(JTableEx.java:295)
  at com.bsiag.swing.plaf.synth.SynthTableUI.paintCells(SynthTableUI.java:511)
  at com.bsiag.swing.plaf.synth.SynthTableUI.paint(SynthTableUI.java:300)
  at com.bsiag.swing.plaf.synth.SynthTableUI.update(SynthTableUI.java:226)
  at javax.swing.JComponent.paintComponent(JComponent.java:751)
  at javax.swing.JComponent.paint(JComponent.java:1017)
  at javax.swing.JComponent.paintChildren(JComponent.java:852)
  at javax.swing.JComponent.paint(JComponent.java:1026)
  at javax.swing.JViewport.paint(JViewport.java:747)
  at javax.swing.JComponent.paintToOffscreen(JComponent.java:5112)
  at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278)
  at javax.swing.RepaintManager.paint(RepaintManager.java:1220)
  at javax.swing.JComponent._paintImmediately(JComponent.java:5060)
  at javax.swing.JComponent.paintImmediately(JComponent.java:4870)
  at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803)
  at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
  at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
  at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
  at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

EVALUATION:
The NPE is thrown because one of the rows is null. If this is a valid case, a null-check has to be introduced.
Otherwise, we suggest checking if all operations in AbstractTable really are thread-safe (because the problem often occurs while making many very fast user inputs).
We have the impression that the problem was introduced with the "row filter cache" feature.

PROPOSED SOLUTION:
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