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via Coderanch by Kunal Lakhani, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at org.nit.StudentDatabase2.itemStateChanged(StudentDatabase2.java:358)	at javax.swing.AbstractButton.fireItemStateChanged(AbstractButton.java:2023)	at javax.swing.AbstractButton$Handler.itemStateChanged(AbstractButton.java:2325)	at javax.swing.DefaultButtonModel.fireItemStateChanged(DefaultButtonModel.java:440)	at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:255)	at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:272)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)	at java.awt.Component.processMouseEvent(Component.java:6216)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)	at java.awt.Component.processEvent(Component.java:5981)	at java.awt.Container.processEvent(Container.java:2041)	at java.awt.Component.dispatchEventImpl(Component.java:4583)	at java.awt.Container.dispatchEventImpl(Container.java:2099)	at java.awt.Component.dispatchEvent(Component.java:4413)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4556)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4220)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4150)	at java.awt.Container.dispatchEventImpl(Container.java:2085)	at java.awt.Window.dispatchEventImpl(Window.java:2475)	at java.awt.Component.dispatchEvent(Component.java:4413)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)