Sometimes: java.lang.SecurityException: Permission denied

Question

Hello,
we are using a lot of signed applets in our Web application (used web server: JBoss 5.1).
For example we use an applet in javascript code and call some of applet's methods. The called java methods are privileged code.
Since Update to JRE 1.6.0_24 we are getting sometimes:
Permission denied: null
java.lang.SecurityException: Permission denied: null
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Ausnahme: java.lang.SecurityException: Permission denied: null
java.net.MalformedURLException: no protocol: ./Test.jar
     at java.net.URL.<init>(Unknown Source)
     at java.net.URL.<init>(Unknown Source)
     at sun.plugin.util.GrayBoxPainter.setProgressFilter(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.setupGrayBoxPainter(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.showAppletException(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Test.jar is signed. Most of the time Test.jar can be found. The problem seems to appear in case of new JVM (and new java console).
We arent't operating on the local file system.
Are there any ideas, known problems?
Thanks in advance.

Answer 1

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.