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via Coderanch by Krithika Beri, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at Main.tables(Main.java:166)	at Main$2.valueChanged(Main.java:130)	at javax.swing.JTree.fireValueChanged(Unknown Source)	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(Unknown Source)	at javax.swing.JTree.setSelectionPath(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)