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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)