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This exception has no message.
java.lang.NullPointerException: 	at StudentDataTable.getColumnClass(StudentDataTable.java:51)	at javax.swing.JTable.getColumnClass(JTable.java:1752)	at javax.swing.JTable.getCellRenderer(JTable.java:3700)	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1148)	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)	at javax.swing.JComponent.paintComponent(JComponent.java:541)	at javax.swing.JComponent.paint(JComponent.java:808)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JViewport.paint(JViewport.java:722)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4787)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4740)	at javax.swing.JComponent._paintImmediately(JComponent.java:4685)	at javax.swing.JComponent.paintImmediately(JComponent.java:4488)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)	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)