Tested Build : build 1.6.0-b66 and pit build
Build Location : /net/sqesvr-nfs.sfbay/global/nfs/deployment5/pit_builds

Build Location : /net/koori/onestop/jdk/1.6.0/latest
OS/Machines : DNM-011(winxp professional), windows-64(winxp professional), JITENDER(winxp home), paris2(Linux ADS3.0), jd-sqe01(linux ADS4.0), kgb(solaris10)

Problem description:
Different applets throws any of the following exception when Refresh button is pressed

(mainly on unix platforms)
java.lang.NullPointerException
at sun.plugin.viewer.MNetscapePluginObject.setParameter(Unknown Source)
at sun.plugin.viewer.MNetscapePluginObject.setFrameSize(Unknown Source)
at sun.plugin.viewer.MNetscapePluginObject.appletStateChanged(Unknown Source)
at sun.applet.AppletEventMulticaster.appletStateChanged(Unknown Source)
at sun.applet.AppletPanel.dispatchAppletEvent(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

OR
(mainly on unix platforms)
Exception in thread "AWT-EventQueue-10" java.lang.NullPointerException
at sun.awt.X11.XButtonPeer.paintText(Unknown Source)
at sun.awt.X11.XButtonPeer.paint(Unknown Source)
at sun.awt.X11.XButtonPeer.paint(Unknown Source)
at sun.awt.X11.XWindow.repaint(Unknown Source)
at sun.awt.X11.XButtonPeer.focusLost(Unknown Source)
at sun.awt.X11.XComponentPeer.handleJavaFocusEvent(Unknown Source)
at sun.awt.X11.XComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at sun.awt.X11.XWindow$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

OR
(mainly on unix platforms)
Exception in thread "AWT-EventQueue-69" java.util.NoSuchElementException
at java.util.LinkedList.getFirst(Unknown Source)
at java.awt.SequencedEvent.getFirst(Unknown Source)
at java.awt.SequencedEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Sourc

OR
(Mainly on windows)
Exception in thread "AWT-EventQueue-1" java.lang.IllegalArgumentException: null source
at java.util.EventObject.<init>(Unknown Source)
at java.awt.AWTEvent.<init>(Unknown Source)
at java.awt.event.ComponentEvent.<init>(Unknown Source)
at java.awt.event.WindowEvent.<init>(Unknown Source)
at java.awt.event.WindowEvent.<init>(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.SequencedEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Steps to reproduce:
1) Load the following applet inside the mozilla browser
http://sqeweb.sfbay.sun.com/deployment2/jitu/plug-bug/applet_communication/static_var/test3/applet_frame.html
2)Invoke Java console
3) Press Refresh button on browser repeatedly
4) Click on Java console and click back on applet window, if you notice any of the above mentioned exception on the java console then the bug is reporduced
Tested Build : build 1.6.0-b66 and pit build
Build Location : /net/sqesvr-nfs.sfbay/global/nfs/deployment5/pit_builds

Build Location : /net/koori/onestop/jdk/1.6.0/latest
OS/Machines : DNM-011(winxp professional), windows-64(winxp professional), JITENDER(winxp home), paris2(Linux ADS3.0), jd-sqe01(linux ADS4.0), kgb(solaris10)

Problem description:
Different applets throws any of the following exception when Refresh button is pressed

(mainly on unix platforms)
java.lang.NullPointerException
at sun.plugin.viewer.MNetscapePluginObject.setParameter(Unknown Source)
at sun.plugin.viewer.MNetscapePluginObject.setFrameSize(Unknown Source)
at sun.plugin.viewer.MNetscapePluginObject.appletStateChanged(Unknown Source)
at sun.applet.AppletEventMulticaster.appletStateChanged(Unknown Source)
at sun.applet.AppletPanel.dispatchAppletEvent(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

OR
(mainly on unix platforms)
Exception in thread "AWT-EventQueue-10" java.lang.NullPointerException
at sun.awt.X11.XButtonPeer.paintText(Unknown Source)
at sun.awt.X11.XButtonPeer.paint(Unknown Source)
at sun.awt.X11.XButtonPeer.paint(Unknown Source)
at sun.awt.X11.XWindow.repaint(Unknown Source)
at sun.awt.X11.XButtonPeer.focusLost(Unknown Source)
at sun.awt.X11.XComponentPeer.handleJavaFocusEvent(Unknown Source)
at sun.awt.X11.XComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at sun.awt.X11.XWindow$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

OR
(mainly on unix platforms)
Exception in thread "AWT-EventQueue-69" java.util.NoSuchElementException
at java.util.LinkedList.getFirst(Unknown Source)
at java.awt.SequencedEvent.getFirst(Unknown Source)
at java.awt.SequencedEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Sourc

OR
(Mainly on windows)
Exception in thread "AWT-EventQueue-1" java.lang.IllegalArgumentException: null source
at java.util.EventObject.<init>(Unknown Source)
at java.awt.AWTEvent.<init>(Unknown Source)
at java.awt.event.ComponentEvent.<init>(Unknown Source)
at java.awt.event.WindowEvent.<init>(Unknown Source)
at java.awt.event.WindowEvent.<init>(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.SequencedEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Steps to reproduce:
1) Load the following applet inside the mozilla browser
http://sqeweb.sfbay.sun.com/deployment2/jitu/plug-bug/applet_communication/static_var/test3/applet_frame.html
2)Invoke Java console
3) Press Refresh button on browser repeatedly
4) Click on Java console and click back on applet window, if you notice any of the above mentioned exception on the java console then the bug is reporduced