java.lang.NullPointerException

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    • java.lang.NullPointerException at jd_back$1.valueChanged(jd_back.java:56) at javax.swing.JTree.fireValueChanged(JTree.java:2406) at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:2777) at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629) at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570) at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:740) at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626) at javax.swing.plaf.basic.BasicTreeUI$TreeModelHandler.treeStructureChanged(BasicTreeUI.java:2469) at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:561) at javax.swing.tree.DefaultTreeModel.reload(DefaultTreeModel.java:277) at javax.swing.tree.DefaultTreeModel.reload(DefaultTreeModel.java:194) at jd_back.updateTree(jd_back.java:109) at jd_back$command_listner.mouseClicked(jd_back.java:73) at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:208) at java.awt.Component.processMouseEvent(Component.java:5137) at java.awt.Component.processEvent(Component.java:4931) at java.awt.Container.processEvent(Container.java:1566) at java.awt.Component.dispatchEventImpl(Component.java:3639) at java.awt.Container.dispatchEventImpl(Container.java:1623) at java.awt.Component.dispatchEvent(Component.java:3480) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3174) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095) at java.awt.Container.dispatchEventImpl(Container.java:1609) at java.awt.Window.dispatchEventImpl(Window.java:1590) at java.awt.Component.dispatchEvent(Component.java:3480) at java.awt.EventQueue.dispatchEvent(EventQueue.java:450) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136) at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
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