Configuration: JDK1.1.5 + Swing-Pre-1.0(2/3) + WindowsNT

From the organic look and feel, the method, deiconifyFrame() of the DesktopManager causes the following exception. It was fine with other look and feels.

Here is the line that caused the exception(frame is JInternalFrame):
frame.getDesktopPane().getDesktopManager().deiconifyFrame(frame)

java.lang.NullPointerException
        at InternalTest3.actionPerformed(InternalTest3.java:29)
        at com.sun.java.swing.AbstractButton.fireActionPerformed(AbstractButton.
java:811)
        at com.sun.java.swing.AbstractButton$ForwardActionEvents.actionPerformed
(AbstractButton.java:846)
        at com.sun.java.swing.DefaultButtonModel.fireActionPerformed(DefaultButt
onModel.java:338)
        at com.sun.java.swing.DefaultButtonModel.setPressed(DefaultButtonModel.j
ava:230)
        at com.sun.java.swing.plaf.basic.BasicButtonListener.mouseReleased(Basic
ButtonListener.java:154)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:2
35)
        at java.awt.Component.processMouseEvent(Component.java:2284)
        at java.awt.Component.processEvent(Component.java:2129)
        at java.awt.Container.processEvent(Container.java:894)
        at java.awt.Component.dispatchEventImpl(Component.java:1764)
        at java.awt.Container.dispatchEventImpl(Container.java:939)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1548
)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1457)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1392)
        at java.awt.Container.dispatchEventImpl(Container.java:926)
        at java.awt.Window.dispatchEventImpl(Window.java:443)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:63)


I attached test case and used /usr/local/java/swing-pre-1.0 to test because this build has organic look. To reproduce:
1) run attached app.
2) iconify the internal frame
3) click bottom "deiconify-two" button.
4) You will get exception.

bae-chul.kim@Eng 1998-03-04