[jfreechart-dev] [ jfreechart-Bugs-1779941 ] StatisticalBarRenderer NullPointerException

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Bugs item #1779941, was opened at 2007-08-22 22:18
Message generated for change (Comment added) made by nobody
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Category: General
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: David Forslund (dwforslund)
Assigned to: Nobody/Anonymous (nobody)
Summary: StatisticalBarRenderer NullPointerException

Initial Comment:
I'm getting a null pointer exception in StatisticalBarRenderer when one of a series in a category has no data.  This works fine with BoxAndWhisker plots, but not in this one.  Shouldn't it simply leave out the corresponding bar rather than giving a null pointer?

The traceback yields:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at org.jfree.chart.renderer.category.StatisticalBarRenderer.drawVerticalItem(StatisticalBarRenderer.java:351)
	at org.jfree.chart.renderer.category.StatisticalBarRenderer.drawItem(StatisticalBarRenderer.java:166)
	at org.jfree.chart.plot.CategoryPlot.render(CategoryPlot.java:2796)
	at org.jfree.chart.plot.CategoryPlot.draw(CategoryPlot.java:2613)
	at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1214)
	at org.jfree.chart.ChartPanel.paintComponent(ChartPanel.java:1270)
	at javax.swing.JComponent.paint(JComponent.java:1022)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	at javax.swing.JComponent.paint(JComponent.java:1031)
	at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
	at javax.swing.JComponent.paintChildren(JComponent.java:859)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5111)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1382)
	at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1313)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:301)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
	at javax.swing.JComponent.paint(JComponent.java:1008)
	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
	at java.awt.Container.paint(Container.java:1797)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:734)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
	at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
	at javax.swing.SystemEventQueueUtilities$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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Comment By: Nobody/Anonymous (nobody)
Date: 2007-08-23 21:10

Message:
Logged In: NO 

I added the change to check for null in the two methods for this class
(similar to the other similar renderers) and this fixes the problem.  It is
a one line change in two places.  If the meanValue is null simply return.


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Comment By: David Forslund (dwforslund)
Date: 2007-08-22 22:22

Message:
Logged In: YES 
user_id=6055
Originator: YES

Looking at the source code it isn't checking on the MeanValue.  The
BoxAndWhiskerRenderer does check on this.  I suspect this isn't the only
place where a NullPointer will occur in this class.

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https://sourceforge.net/tracker/?func=detail&atid=115494&aid=1779941&group_id=15494