The following exception happens when running some VM tests under N1 Grid Engine. It only happens sometimes. There is no obvious pattern. It is also not very easy to reproduce as it requires running tests under Tonga harness. Let me know what can be done to track the source of the problem.

Exception in thread "main" java.lang.NullPointerException
       at java.security.Permissions.add(Permissions.java:117)
       at java.net.URLClassLoader.getPermissions(URLClassLoader.java:495)
       at sun.misc.Launcher$AppClassLoader.getPermissions(Launcher.java:284)
       at java.security.SecureClassLoader.getProtectionDomain(SecureClassLoader.java:192)
       at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
       at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)