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Re: Null pointer exceptio

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  To: comp.lang.java.gui
On Apr 30, 10:48 pm, Lightning McQueen <mangaise...@gmail.com> wrote:
> I am trying to repaint a component that displays a buffered image when
> the component is scrolled. I get the following error:
>      [java] java.lang.NullPointerException: NullSD does not handle
> this operation
>      [java] at sun.java2d.NullSurfaceData.getRaster(Unknown Source)
>      [java] at sun.java2d.loops.OpaqueCopyAnyToArgb.Blit(Unknown
> Source)
>      [java] at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown
> Source)
>      [java] at sun.java2d.loops.MaskBlit$General.MaskBlit(Unknown
> Source)
>      [java] at sun.java2d.loops.Blit$GeneralMaskBlit.Blit(Unknown
> Source)
>      [java] at sun.java2d.pipe.AlphaPaintPipe.renderPathTile(Unknown
> Source)
>      [java] at sun.java2d.pipe.SpanShapeRenderer
> $Composite.renderBox(Unknown Source)
>      [java] at sun.java2d.pipe.SpanShapeRenderer.spanClipLoop(Unknown
> Source)
>      [java] at sun.java2d.pipe.SpanShapeRenderer.renderSpans(Unknown
> Source)
>      [java] at sun.java2d.pipe.SpanShapeRenderer.renderPath(Unknown
> Source)
>      [java] at sun.java2d.pipe.SpanShapeRenderer.fill(Unknown Source)
>      [java] at sun.java2d.pipe.ValidatePipe.fill(Unknown Source)
>      [java] at sun.java2d.SunGraphics2D.fill(Unknown Source)
>      [java] at
> i3dea.ditto.DocumentImageDisplay.paintZone(DocumentImageDisplay.java:
> 256)
>      [java] at
> i3dea.ditto.DocumentImageDisplay.paintComponent(DocumentImageDisplay.java:
> 467)
>      [java] at javax.swing.JComponent.paint(Unknown Source)
>      [java] at javax.swing.JComponent.paintChildren(Unknown Source)
>      [java] at javax.swing.JComponent.paint(Unknown Source)
>      [java] at javax.swing.JViewport.paint(Unknown Source)
>      [java] at javax.swing.JComponent.paintChildren(Unknown Source)
>      [java] at javax.swing.JComponent.paint(Unknown Source)
>      [java] at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown
> Source)
>      [java] at javax.swing.JComponent.paintDoubleBuffered(Unknown
> Source)
>      [java] at javax.swing.JComponent._paintImmediately(Unknown
> Source)
>      [java] at javax.swing.JComponent.paintImmediately(Unknown Source)
>      [java] at javax.swing.RepaintManager.paintDirtyRegions(Unknown
> Source)
>      [java] at javax.swing.SystemEventQueueUtilities
> $ComponentWorkRequest.run(Unknown Source)
>      [java] at java.awt.event.InvocationEvent.dispatch(Unknown Source)
>      [java] at java.awt.EventQueue.dispatchEvent(Unknown Source)
>      [java] at
> java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
>      [java] at
> java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
>      [java] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
>      [java] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
>      [java] at java.awt.EventDispatchThread.run(Unknown Source)
>
> Thanks
> Mangai

I think that JScrollPane does this automatically for you.

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Null pointer exception wh "Lightning McQueen" <lightning.mcqueen@THRWHITE.remove-dii-this> - 2011-04-27 15:34 +0000
  Re: Null pointer exceptio "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:34 +0000

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