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This exception has no message.
java.lang.NullPointerException: 	at UtilityMethods$1.getColumnClass(UtilityMethods.java:321)	at javax.swing.JTable.getColumnClass(JTable.java:1695)	at javax.swing.JTable.getCellRenderer(JTable.java:3512)	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:994)	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:917)	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:858)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:39)	at javax.swing.JComponent.paintComponent(JComponent.java:395)	at javax.swing.JComponent.paint(JComponent.java:687)	at javax.swing.JComponent.paintChildren(JComponent.java:498)	at javax.swing.JComponent.paint(JComponent.java:696)	at javax.swing.JViewport.paint(JViewport.java:668)	at javax.swing.JComponent.paintChildren(JComponent.java:498)	at javax.swing.JComponent.paint(JComponent.java:696)	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:23)	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:54)	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:91)	at java.awt.Container.paint(Container.java:960)	at javax.swing.JComponent.paintChildren(JComponent.java:510)	at javax.swing.JComponent.paint(JComponent.java:696)	at javax.swing.JComponent.paintChildren(JComponent.java:498)	at javax.swing.JComponent.paint(JComponent.java:696)	at javax.swing.JComponent.paintChildren(JComponent.java:498)	at javax.swing.JComponent.paint(JComponent.java:696)	at javax.swing.JLayeredPane.paint(JLayeredPane.java:546)	at javax.swing.JComponent.paintChildren(JComponent.java:498)	at javax.swing.JComponent.paint(JComponent.java:669)	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:23)	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:54)	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:91)	at java.awt.Container.paint(Container.java:960)	at javax.swing.JFrame.update(JFrame.java:329)	at sun.awt.RepaintArea.update(RepaintArea.java:337)	at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:200)	at java.awt.Component.dispatchEventImpl(Component.java:2663)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Window.dispatchEventImpl(Window.java:914)	at java.awt.Component.dispatchEvent(Component.java:2497)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)