java.lang.NullPointerException

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    • java.lang.NullPointerException at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.grabContainer(BasicPopupMenuUI.java:383) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.requestAddGrab(BasicPopupMenuUI.java:267) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.stateChanged(BasicPopupMenuUI.java:323) at javax.swing.MenuSelectionManager.fireStateChanged(MenuSelectionManager.java:161) at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:87) at javax.swing.JPopupMenu.setVisible(JPopupMenu.java:751) at javax.swing.JPopupMenu.show(JPopupMenu.java:927) at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:177) at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:927) at javax.swing.JComboBox.setPopupVisible(JComboBox.java:790) at SimpleTableDemo$1.mouseClicked(SimpleTableDemo.java:59) at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212) at java.awt.Component.processMouseEvent(Component.java:5103) at java.awt.Component.processEvent(Component.java:4897) at java.awt.Container.processEvent(Container.java:1569) at java.awt.Component.dispatchEventImpl(Component.java:3615) at java.awt.Container.dispatchEventImpl(Container.java:1627) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3207) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128) at java.awt.Container.dispatchEventImpl(Container.java:1613) at java.awt.Window.dispatchEventImpl(Window.java:1606) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.EventQueue.dispatchEvent(EventQueue.java:456) 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)
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