JSlider錯誤，但不知道它來自哪裏

在我的程序中的某個點，正在生成以下錯誤。任何想法這是什麼？JSlider錯誤，但不知道它來自哪裏

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)

來源

2011-08-17 CodeGuy

我有一個想法：告訴我們你的代碼，以便我們可以知道是什麼原因導致這個錯誤 –

很多人在這裏只EXCELENT的Java/C /，彙編程序員，但沒有人是mindreader，沒有電池 – mKorbel

你需要更長的堆棧跟蹤，這些都是java類。您現在需要現在發生在您的哪些課程中。 –

我在初始化時彈出類似的間歇NPE時，將滑塊設置爲使用擴展BasicSliderUI的自定義UI。我固定他們通過在invokeLater的包裝它：

SwingUtilities.invokeLater(new Runnable(){ 
     @Override public void run() { 
      slider.setUI(new CustomSliderUI(slider)); 
     } 
    });

來源

2011-08-18 23:01:48 horfcha

JSlider錯誤，但不知道它來自哪裏

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