New java plug-in on linux : jnlp applets not working

Hello my dear forum,
Here is (a part of) my configuration :
* Ubuntu 9.04
* Firefox 3.0.13
* Java Plug-in 1.6.0_14 with JRE 1.6.0_14-b08
I couldn't launch jogl applets in firefox with ubuntu since I updated the new plugin. (like this one : https://jogl-demos.dev.java.net/applettest.html)
I get this error :
java.lang.ClassCastException: sun.awt.motif.MToolkit cannot be cast to sun.awt.X11.XToolkit
     at sun.awt.X11.XEmbeddedFrame.addNotify(XEmbeddedFrame.java:53)
     at sun.plugin2.main.client.PluginEmbeddedFrame.addNotify(PluginEmbeddedFrame.java:46)
     at sun.awt.X11.XEmbeddedFrame.<init>(XEmbeddedFrame.java:43)
     at sun.awt.X11.XEmbeddedFrame.<init>(XEmbeddedFrame.java:60)
     at sun.plugin2.main.client.PluginEmbeddedFrame.<init>(PluginEmbeddedFrame.java:37)
     at sun.plugin2.main.client.PluginMain$StartAppletRunner.run(PluginMain.java:927)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
PluginMain: could not create embedded frame
Does this problem have something to do with this one : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6625747 ?
I would really appreciate if someone can help me.

poupitoupou wrote:
I thought Java was cross-platform, snirf...It is. But if one uses code that relies on a particular platform then all bets are off.
>
I wonder how many people manage to get this applet working on linux :
https://jogl-demos.dev.java.net/applettest.html
I don't know what 'working' means for this. I'm using 1.6.0_15 on Ubuntu 9.04 an all I see is 3 gear wheels that don't move.
>
Listen, you forum-reader, if you are on linux, can you test this applet and tell me if it is working ?Again - what does 'working' mean?

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