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我在我的摇摆应用程序中添加了物质主题并尝试运行它，它可以工作。但我在运行它时不断收到这个异常。有人可以告诉我如何解决吗？

例外................................................. .....................................

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at org.jvnet.substance.SubstanceTableUI$TableStateListener$2.run(SubstanceTableUI.java:1951)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

代码................................................. ...................................................

   try {
        LookAndFeel look = new SubstanceDefaultLookAndFeel();
        UIManager.setLookAndFeel(look);
        SubstanceDefaultLookAndFeel.setCurrentTheme(new SubstanceBottleGreenTheme());
        SubstanceDefaultLookAndFeel.setCurrentWatermark(new SubstanceNoneWatermark());
        SubstanceDefaultLookAndFeel.setCurrentGradientPainter(new SimplisticSoftBorderReverseGradientPainter());
        new Login().setVisible(true);
   } catch (Exception e) {
        e.printStackTrace();
   }
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1 回答 1

1

确保您在事件分派线程上显式创建您的 GUI。当我没有这样做时，我在一些外观和感觉上遇到了这个问题。你可以通过在 EDT 上排队你的启动代码来做到这一点

SwingUtilities.invokeLater(new Runnable() {
  public void run() {
    // start your GUI here
  }
});

IE，

SwingUtilities.invokeLater(new Runnable() {
  public void run() {
    try {
        LookAndFeel look = new SubstanceDefaultLookAndFeel();
        UIManager.setLookAndFeel(look);
        SubstanceDefaultLookAndFeel.setCurrentTheme(new SubstanceBottleGreenTheme());
        SubstanceDefaultLookAndFeel.setCurrentWatermark(new SubstanceNoneWatermark());
        SubstanceDefaultLookAndFeel.setCurrentGradientPainter(
           new SimplisticSoftBorderReverseGradientPainter());
        new Login().setVisible(true);
    } catch (Exception e) {
        e.printStackTrace();
    }
  }
}

编辑，mKorbel 是对的——外观和感觉的变化应该在 EDT 上。代码已更改以反映这一点。对不起，错误信息。

于 2013-12-15T03:47:58.083 回答