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java.lang.NullPointerException: 	at javax.swing.JTable$1.getRowCount(JTable.java:422)	at javax.swing.JTable.getRowCount(JTable.java:1716)	at javax.swing.JTable.valueChanged(JTable.java:3137)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)	at javax.swing.DefaultListSelectionModel.setAnchorSelectionIndex(DefaultListSelectionModel.java:606)	at javax.swing.JTable.initializeLocalVars(JTable.java:3547)	at javax.swing.JTable.(JTable.java:370)	at javax.swing.JTable.(JTable.java:308)	at javax.swing.JTable.(JTable.java:420)	at undefined.Pilha.(Pilha.java:122)	at undefined.MainFrame$3.actionPerformed(Simuled.java:169)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)	at java.awt.Component.processMouseEvent(Component.java:5100)	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:3198)	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)