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私のプログラムのある時点で、次のエラーが生成されています。これが何であるかについて何か考えはありますか？

  Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at javax.swing.plaf.basic.BasicSliderUI.calculateThumbLocation(Unknown Source)
        at javax.swing.plaf.basic.BasicSliderUI.calculateGeometry(Unknown Source)
        at javax.swing.plaf.basic.BasicSliderUI$Handler.componentResized(Unknown Source)
        at java.awt.Component.processComponentEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$000(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.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.awt.EventQueue$4.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)
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1 に答える 1

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BasicSliderUIを拡張したカスタムUIを使用するようにスライダーを設定すると、初期化中に同様の断続的なNPEがポップアップしました。私はそれをinvokeLaterでラップすることによってそれらを修正しました：

SwingUtilities.invokeLater(new Runnable(){
        @Override public void run() {
            slider.setUI(new CustomSliderUI(slider));
        }
    });
于 2011-08-18T23:01:48.023 に答える