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Actually I've seen plenty of related applet issues being mentioned here over the last few weeks, usually related to the cache and all mentioning this started to happen since recently released JVM updates. I suggest you do some searches for these posts, perhaps some of the threads contain useful information for you.
Seems like the problem is related to the latest Firefox release (3.6.14), the second time you start a specific applet. Have you experienced this with any other browsers ? Can you find any applets that starts two times in a row with this specific version of Firefox ? ;-)1 person found this helpful
I have absolutely the same issue since Update 24.
I think that is is the same issue as discussed in thread: Getting access denied java.io.FilePermission since update 24
There is no solution at present. Seems to be Oracle thinks that backward compatibility is not essential for customers.
Yes, it seems to be a problem we the latest firefox update (3.6.14). We can reproduce it on several machines and with different applets. The first call is OK, the second leads to:
Mabe a new firefox caching Problem?
http://support.mozilla.com/en-US/questions/7882881 person found this helpful
Mozilla stopped pushing updates, status at: https://support.mozilla.com/en-US/forums/contributors/705144
The related mozilla bugs:
We've encountered the same problem
exception: Permission denied: null.
java.lang.SecurityException: Permission denied: null
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.SecurityException: Permission denied: null
But seems to me, that the issue is related to combination of Java6 update 24 and Firefox 3.6.14. We tested on two stations, first FF3.6.14, java6u24, second FF3.6.14, java6u23. On the first station we got exception, but on the second java works fine. After reinstaling java on the first stations to verstion 6u23, everything works fine.
We've encountered the same problem with FF 3.6.14 and JRE 1.6.0_21. The exception occurs after closing and reopening applets html page.
This issue is corrected in Firefox's new version 3.6.15: