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[zengeos <zengeos@xxxxxxxxx>]

I also encountered this problem. Turning off the Icedtea plugin in
Firefox seems to have fixed it. I restarted to ensure that it stayed
fixed and things seem fine now. For me Java was taking so many resources
that I couldn't even properly restart initially.  Thanks for all the
research all.

-- 
Applets use 100% of CPU
https://bugs.launchpad.net/bugs/551328
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Status in “openjdk-6” package in Ubuntu: Confirmed

Bug description:
Using several applets I'm finding the Lucid i386 applet plugin with Firefox 3.6 is using 100% CPU from the time the applet starts. Even if the applet is stopped by closing the parent window the java process continues using 100% of the CPU.

Examples of a sites where this can be experienced:

http://www.java.com/en/download/help/testvm.xml
http://kent.w3.org/People/mimasa/test/object/java/clock
http://www.spunkyworld.com/demos/chat/index.htm