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This exception has no message.
java.lang.NullPointerException: 	at undefined.View$3.valueChanged(View.java:102)	at javax.swing.JList.fireSelectionValueChanged(JList.java:1321)	at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1335)	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.changeSelection(DefaultListSelectionModel.java:402)	at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:411)	at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:435)	at javax.swing.JList.setSelectionInterval(JList.java:1608)	at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.adjustFocusAndSelection(BasicListUI.java:1333)	at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.mousePressed(BasicListUI.java:1295)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222)	at java.awt.Component.processMouseEvent(Component.java:5097)	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:3195)	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)