To reproduce (on Solaris or Linux):
* start up Java2Demo with XToolkit
* click to the Clipping tabv
* click on the Text button in the lower-left demo. The rotating rectangle becomes "J2D"
* click on the rotating J2D

The following exception is thrown:

java.lang.NullPointerException
        at sun.awt.X11.XComponentPeer.getNativeContainer(XComponentPeer.java:220)
        at sun.awt.X11.XKeyboardFocusManagerPeer.clearGlobalFocusOwner(XKeyboardFocusManagerPeer.java:75)
        at java.awt.KeyboardFocusManager._clearGlobalFocusOwner(KeyboardFocusManager.java:522)
        at java.awt.KeyboardFocusManager.clearGlobalFocusOwner(KeyboardFocusManager.java:517)
        at java.awt.Component.doAutoTransfer(Component.java:6386)
        at java.awt.Component.autoTransferFocus(Component.java:6368)
        at java.awt.Component.autoTransferFocus(Component.java:6359)
        at java.awt.Component.hide(Component.java:1198)
        at java.awt.Component.show(Component.java:1169)
        at java.awt.Component.setVisible(Component.java:1122)
        at javax.swing.JComponent.setVisible(JComponent.java:2215)
        at javax.swing.JTabbedPane.insertTab(JTabbedPane.java:598)
        at javax.swing.JTabbedPane.addTab(JTabbedPane.java:675)
        at java2d.DemoGroup.mouseClicked(DemoGroup.java:127)
        at java.awt.Component.processMouseEvent(Component.java:5310)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:2784)
        at java.awt.Component.processEvent(Component.java:5104)
        at java.awt.Container.processEvent(Container.java:1932)
        at java.awt.Component.dispatchEventImpl(Component.java:3808)
        at java.awt.Container.dispatchEventImpl(Container.java:1990)
        at java.awt.Component.dispatchEvent(Component.java:3659)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3854)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3578)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3499)
        at java.awt.Container.dispatchEventImpl(Container.java:1976)
        at java.awt.Window.dispatchEventImpl(Window.java:1638)
        at java.awt.Component.dispatchEvent(Component.java:3659)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:214)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)