java.lang.NullPointerException: This exception has no message.
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java.lang.NullPointerException:
at sun.java2d.SunGraphics2D.revalidateAll(SunGraphics2D.java:2086)
at sun.java2d.SunGraphics2D.getCompClip(SunGraphics2D.java:439)
at sun.java2d.SunGraphics2D.invalidateClip(SunGraphics2D.java:1640)
at sun.java2d.SunGraphics2D.setClip(SunGraphics2D.java:1746)
at sun.java2d.SunGraphics2D.setClip(SunGraphics2D.java:1737)
at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4804)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)
at javax.swing.JComponent._paintImmediately(JComponent.java:4692)
at javax.swing.JComponent.paintImmediately(JComponent.java:4495)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:449)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)