Build : Jdk121k
OS : Win 95

Steps to Reproduce:

1. Launch the Java2Demo application from the demo/jfc/Java2D/java Java2Demo.
2. Select the Run Menu item from the Options menu item : Options -> Run or Options -> Background color we get a stack of exceptions , a part of which is below:
E:\jdk121j\demo\jfc\Java2D>java Java2Demo
Exception occurred during event dispatching:
java.lang.NullPointerException:
        at java.awt.Container.getWindow(Container.java:1196)
        at java.awt.LightweightDispatcher.stopListeningForOtherDrags(Container.j
ava:1938)
        at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:188
1)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1789)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1719)
        at java.awt.Container.dispatchEventImpl(Container.java:1023)
        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, C
ompiled Code)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:87)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:78)
Exception in thread "AWT-Windows" java.lang.NullPointerException:
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(WToolkit.java:137)
        at java.lang.Thread.run(Thread.java:479)

Java2D Demo RunWindow : 20 Runs, 10 second delay between tabs
java version: 1.2.1
Windows 95 4.0


Further operations leads to further breakdown and lot more exception messages.
This bug was observed from jdk121i build.