[JAVA] Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Solution    : You have to set the initial value at static value.

                 static으로 선언한 변수를 초기화 하지 않는 경우 발생합니다.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)

at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)

at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)

at javax.swing.plaf.ComponentUI.update(Unknown Source)

at javax.swing.JComponent.paintComponent(Unknown Source)

at javax.swing.JComponent.paint(Unknown Source)

at javax.swing.JComponent.paintChildren(Unknown Source)

at javax.swing.JComponent.paint(Unknown Source)

at javax.swing.JViewport.paint(Unknown Source)

at javax.swing.JComponent.paintChildren(Unknown Source)

at javax.swing.JComponent.paint(Unknown Source)

at javax.swing.JComponent.paintChildren(Unknown Source)

at javax.swing.JComponent.paint(Unknown Source)

at javax.swing.JComponent.paintToOffscreen(Unknown Source)

at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)

at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)

at javax.swing.RepaintManager.paint(Unknown Source)

at javax.swing.JComponent._paintImmediately(Unknown Source)

at javax.swing.JComponent.paintImmediately(Unknown Source)

at javax.swing.RepaintManager$4.run(Unknown Source)

at javax.swing.RepaintManager$4.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)

at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)

at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)

at javax.swing.RepaintManager.access$1300(Unknown Source)

at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)

at java.awt.event.InvocationEvent.dispatch(Unknown Source)

at java.awt.EventQueue.dispatchEventImpl(Unknown Source)

at java.awt.EventQueue.access$500(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.awt.EventQueue$3.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)