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This exception has no message.
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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI$Handler.treeNodesChanged(BasicTreeUI.java:3833)	at javax.swing.tree.DefaultTreeModel.fireTreeNodesChanged(DefaultTreeModel.java:486)	at javax.swing.tree.DefaultTreeModel.nodesChanged(DefaultTreeModel.java:348)	at javax.swing.tree.DefaultTreeModel.nodeChanged(DefaultTreeModel.java:279)	at org.apache.log4j.lf5.viewer.categoryexplorer.CategoryExplorerModel$1.run(CategoryExplorerModel.java:328)	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)	at 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.pumpEventsForHierarchy(EventDispatchThread.java:117)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)