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Linux プラットフォームでアプリケーションを実行すると、以下の例外がスローされ、フレーム/パネルにコンポーネントが表示されず、グレー表示された画面が表示され、コンポーネント上でマウス ポイントをクリック/移動するとコンポーネントが表示されます。また、動的テスト更新ボタンがあり、これもマウスがボタンの上に移動するたびに更新されます。

注: この同じアプリケーションは、Windows プラットフォームで正常に動作します。

INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 | Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 |     at javax.swing.plaf.basic.BasicButtonUI.getMinimumSize(BasicButtonUI.java:352)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 |     at javax.swing.JComponent.getMinimumSize(JComponent.java:1714)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 |     at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:651)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 |     at java.awt.Container.minimumSize(Container.java:1651)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.995 |     at java.awt.Container.getMinimumSize(Container.java:1636)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at javax.swing.JComponent.getMinimumSize(JComponent.java:1716)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.FlowLayout.minimumLayoutSize(FlowLayout.java:448)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.minimumSize(Container.java:1651)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.getMinimumSize(Container.java:1636)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at javax.swing.JComponent.getMinimumSize(JComponent.java:1716)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:1094)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:893)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:2052)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:2008)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:789)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.layout(Container.java:1421)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.doLayout(Container.java:1410)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validateTree(Container.java:1507)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validateTree(Container.java:1513)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validateTree(Container.java:1513)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validateTree(Container.java:1513)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validateTree(Container.java:1513)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.Container.validate(Container.java:1480)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:669)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:124)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:642)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventQueue.access$000(EventQueue.java:85)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventQueue$1.run(EventQueue.java:603)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventQueue$1.run(EventQueue.java:601)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.security.AccessController.doPrivileged(Native Method)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventQueue.dispatchEvent(EventQueue.java:612)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
INFO   | jvm 1    | main    | 2013/01/21 15:14:23.996 |     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
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1 に答える 1

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では、スタック トレースをしばらく掘り下げてみましょう。

javax.swing.plaf.basic.BasicButtonUI.getMinimumSize(BasicButtonUI.java:352) で

そこにあるコードを見てみましょう。

public Dimension getMinimumSize(JComponent c) {
    Dimension d = getPreferredSize(c);
View v = (View) c.getClientProperty(BasicHTML.propertyKey);
if (v != null) {
    d.width -= v.getPreferredSpan(View.X_AXIS) - v.getMinimumSpan(View.X_AXIS); // Line 352
}
return d;
}

わかりましたので、あなたNullPointerExceptionは which から来てgetPreferredSize(JComponent c)います を返しますnull。

最終的には、ボタンに追加のコンポーネントが含まれているか、Linux で選択されたルック アンド フィールがnull値を返すかのいずれかです (何らかの理由で、詳細が少ないため、見つけることはほぼ不可能です)。

于 2013-01-21T16:09:04.833 に答える