[jfreechart-dev] [ jfreechart-Bugs-3406590 ] Exception due to apparent race condition

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Bugs item #3406590, was opened at 2011-09-08 22:39
Message generated for change (Settings changed) made by mungady
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Category: None
>Group: 1.0.x
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Darren Hiebert (dhiebert)
>Assigned to: David Gilbert (mungady)
Summary: Exception due to apparent race condition

Initial Comment:
There appears to be a race condition in JFreeChart, as I keep seeing an exception thrown that seems impossible to have happened unless the values changed between the throwing of the exception and the assembling of the exception string. Here is the exception trace:

Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 1, Size: 3
	at java.util.ArrayList.rangeCheck(ArrayList.java:604)
	at java.util.ArrayList.get(ArrayList.java:382)
	at org.jfree.data.ComparableObjectSeries.getDataItem(ComparableObjectSeries.java:332)
	at org.jfree.data.xy.XYIntervalSeries.getDataItem(XYIntervalSeries.java:189)
	at org.jfree.data.xy.XYIntervalSeries.getYValue(XYIntervalSeries.java:147)
	at org.jfree.data.xy.XYIntervalSeriesCollection.getYValue(XYIntervalSeriesCollection.java:199)
	at org.jfree.chart.renderer.xy.XYBarRenderer.drawItem(XYBarRenderer.java:943)
	at org.jfree.chart.plot.XYPlot.render(XYPlot.java:3738)
	at org.jfree.chart.plot.XYPlot.draw(XYPlot.java:3310)
	at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1235)
	at org.jfree.chart.ChartPanel.paintComponent(ChartPanel.java:1668)
	at javax.swing.JComponent.paint(JComponent.java:1054)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1482)
	at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1413)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:311)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
	at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
	at java.awt.EventQueue.access$000(EventQueue.java:101)
	at java.awt.EventQueue$3.run(EventQueue.java:666)
	at java.awt.EventQueue$3.run(EventQueue.java:664)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)


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>Comment By: David Gilbert (mungady)
Date: 2011-09-27 19:16

Message:
My guess is that you are updating a dataset outside of the EDT and,
simultaneously, JFreeChart is redrawing the chart via the
ChartPanel.paintComponent() method.  JFreeChart is not thread-safe - you
should make all dataset updates on the EDT for Swing apps.

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