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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)