Build : 'H'
OS : Win32
app : best demonstrated with Java2Demo - Mix.Balls

In this particular demo there is a lightweight component: JComboBox to select sizes. When making this selection an exception gets thrown:

Java.lang.NullPointerException
        at java.awt.Container.getWindow(Container.java, Compiled Code)
        at java.awt.LightweightDispatcher.stopListeningForOtherDrags(Container.java, Compiled Code)
        at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java, Compiled Code)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java, Compiled Code)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java, Compiled Code)
        at java.awt.Container.dispatchEventImpl(Container.java, Compiled Code)
        at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java, Compiled Code)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java, Compiled Code)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java, Compiled Code)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java, Compiled Code)


Steps to repo:
   1. Launch Java2Demo as an app or as an applet
   2. Goto the Mix tab
   3. in the bouncing ball demo select a different size

   - you should now get the exception. If you don't get the exception simply reselect a different size.


This problem is still happening in jdk1.2.1-J.
brian.lichtenwalter@Eng 1999-03-09