Input methods inside of Swing text components throw NullPointerExceptions when enter Indic text, if you're lucky you would be able to enter some text before it happens, but once it started to throw, it doesn't seem to stop.

Exception occurred during event dispatching:
java.lang.InternalError: Cannot construct general op for MaskBlit(Lsun/java2d/SurfaceData;Lsun/java2d/SurfaceData;Ljava/awt/Composite;IIIIII[BII)V XOR mode
        at sun.java2d.loops.GraphicsPrimitive.setupGeneralBinaryOp(GraphicsPrimitive.java:230)
        at sun.java2d.loops.MaskBlit.makePrimitive(MaskBlit.java:117)
        at sun.java2d.loops.GraphicsPrimitiveMgr.locate(GraphicsPrimitiveMgr.java:196)
        at sun.java2d.loops.MaskBlit.locate(MaskBlit.java:51)
        at sun.java2d.loops.Blit$General.<init>(Blit.java:120)
        at sun.java2d.loops.Blit.makePrimitive(Blit.java:109)
        at sun.java2d.loops.GraphicsPrimitiveMgr.locate(GraphicsPrimitiveMgr.java:196)
        at sun.java2d.loops.Blit.locate(Blit.java:46)
        at sun.java2d.loops.Blit.getFromCache(Blit.java:59)
        at sun.java2d.pipe.AlphaPaintPipe.renderPathTile(AlphaPaintPipe.java:119)
        at sun.java2d.pipe.SpanShapeRenderer$Composite.renderBox(SpanShapeRenderer.java:45)
        at sun.java2d.pipe.SpanShapeRenderer.spanClipLoop(SpanShapeRenderer.java:237)
        at sun.java2d.pipe.SpanShapeRenderer.renderSpans(SpanShapeRenderer.java:220)
        at sun.java2d.pipe.SpanShapeRenderer.drawBasicStroke(SpanShapeRenderer.java:110)
        at sun.java2d.pipe.SpanShapeRenderer.draw(SpanShapeRenderer.java:73)
        at sun.java2d.pipe.PixelToShapeConverter.drawLine(PixelToShapeConverter.java:37)
        at sun.java2d.pipe.ValidatePipe.drawLine(ValidatePipe.java:30)
        at sun.java2d.SunGraphics2D.drawLine(SunGraphics2D.java:1785)
        at javax.swing.text.JTextComponent$ComposedTextCaret.paint(JTextComponent.java:3008)
        at javax.swing.plaf.basic.BasicTextUI.paintSafely(BasicTextUI.java:528)
        at javax.swing.plaf.basic.BasicTextUI.paint(BasicTextUI.java:658)
        at javax.swing.plaf.basic.BasicTextUI.update(BasicTextUI.java:637)
        at javax.swing.JComponent.paintComponent(JComponent.java:412)
        at javax.swing.JComponent.paint(JComponent.java:713)
        at javax.swing.JComponent.paintWithBuffer(JComponent.java:4221)
        at javax.swing.JComponent._paintImmediately(JComponent.java:4164)
        at javax.swing.JComponent.paintImmediately(JComponent.java:3995)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:374)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:119)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:368)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:127)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:117)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:96)
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to produce, compile and run the attached test case.

Should mention: you need to select Devanagari Input Method in order to enter Devanagari text.

minchi.tien@eng