Java重绘区域错误

Question

这是我偶尔会遇到的错误，但它会停止UI的工作

有谁知道如何解决它？

当我们重新绘制或更新UI时，通常会发生此错误。[/ p>

     Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
            at javax.swing.plaf.synth.SynthLookAndFeel.paintRegion(Unknown Source)
            at javax.swing.plaf.synth.SynthLookAndFeel.update(Unknown Source)
            at javax.swing.plaf.synth.SynthPanelUI.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.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.JLayeredPane.paint(Unknown Source)
            at javax.swing.JComponent.paintChildren(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.paint(Unknown Source)
            at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
            at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
            at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
            at java.awt.Container.paint(Unknown Source)
            at java.awt.Window.paint(Unknown Source)
            at javax.swing.RepaintManager$3.run(Unknown Source)
            at javax.swing.RepaintManager$3.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$1000(Unknown Source)
        at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$200(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)