Why does running an applet within a portlet not work?

Hello,
I have an applet and I want to run this in a portlet.
I tried to load this applet into a portlet with SunONE Studio and Portlet Builder, and it works. The applet is running without problems.
Now I tried to run this applet in a portlet under WebLogic 8.1 SP3. But the applet doesn't load. There ist only a gray rectangle to see. No error message, which would help to find the problem.
To load the applet I'm using the Applet tag as follows:
<APPLET archive='"+request.getContextPath()+"/folder/myApplet.jar' code='source/applet/myapp.class' ></APPLET>
It's the same, I am using with SunOne Studio and there is the same package/directory structure in both.
Any ideas?
Is ist possible to run applets within portlets under WL 8.1?
Thank you!
Ines

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