IllegalStateException: What does it mean?

Question

Can someone explain why i could get the following error?

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Peer does not exist while invoking the increaseComponentCount() method at java.awt.Container.increaseComponentCount(Container.java:3978) at java.awt.Component.addNotify(Component.java:6917) at java.awt.Container.addNotify(Container.java:2758) at javax.swing.JComponent.addNotify(JComponent.java:4743) at java.awt.Container.addImpl(Container.java:1114) at javax.swing.CellRendererPane.addImpl(CellRendererPane.java:106) at java.awt.Container.add(Container.java:410) at javax.swing.CellRendererPane.paintComponent(CellRendererPane.java:134) at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2115) at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016) at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161) at javax.swing.JComponent.paintComponent(JComponent.java:778) at javax.swing.JComponent.paint(JComponent.java:10 54) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295) 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) a t 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.pumpEventsForFilter(EventDispatchThread.java:121) at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221) at java.security.AccessController.doPrivileged(Native Method)

Answer 1

My guess is that you have some threading issue. Are you overriding incorrectly addNotify() by any chance?

http://mindprod.com/jgloss/addnotify.html