I'm getting the following exception when starting all applets in demo/applets
directory simultaneously on a dual-cpu Solaris system:
[tdv@nukite:] -< /import/java/jdk1.6.0/solaris-sparc/demo/applets >
#>../../bin/appletviewer */*.html
Exception in thread "AWT-EventQueue-5" java.lang.IllegalArgumentException: null source
        at java.util.EventObject.<init>(EventObject.java:38)
        at java.awt.AWTEvent.<init>(AWTEvent.java:259)
        at java.awt.event.ComponentEvent.<init>(ComponentEvent.java:97)
        at java.awt.event.WindowEvent.<init>(WindowEvent.java:179)
        at java.awt.event.WindowEvent.<init>(WindowEvent.java:219)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:641)
        at java.awt.Component.dispatchEventImpl(Component.java:4250)
        at java.awt.Container.dispatchEventImpl(Container.java:2042)
        at java.awt.Window.dispatchEventImpl(Window.java:2299)
        at java.awt.Component.dispatchEvent(Component.java:4208)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.SentEvent.dispatch(SentEvent.java:55)
        at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:177)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

I can reproduce it probably 1 out of 3 attempts by just starting all of them
at the same time.

I can't get the same exception on Windows, but I got this one once (also a dual-cpu
system). Note that I only got it when I hit Ctrl+C while the appets were still
starting:
Exception in thread "main" java.lang.InternalError: couldn't create menu peer
        at sun.awt.windows.WMenuItemPeer.checkMenuCreation(WMenuItemPeer.java:103)
        at sun.awt.windows.WMenuItemPeer.<init>(WMenuItemPeer.java:87)
        at sun.awt.windows.WToolkit.createMenuItem(WToolkit.java:442)
        at java.awt.MenuItem.addNotify(MenuItem.java:196)
        at java.awt.Menu.addNotify(Menu.java:158)
        at java.awt.MenuBar.addNotify(MenuBar.java:122)
        at java.awt.Frame.addNotify(Frame.java:475)
        at java.awt.Window.pack(Window.java:556)
        at sun.applet.AppletViewer.<init>(AppletViewer.java:180)
        at sun.applet.StdAppletViewerFactory.createAppletViewer(AppletViewer.java:82)
        at sun.applet.AppletViewer.parse(AppletViewer.java:1122)
        at sun.applet.AppletViewer.parse(AppletViewer.java:1056)
        at sun.applet.Main.run(Main.java:138)
        at sun.applet.Main.main(Main.java:80)

I can not reproduce either of these exceptions on 5.0.