I've just had the same exception using JBOSS 6.0.0.Final and a JDK 6.
The issue was the version of the JDK.
I first used OpenJDK 1.6.0_34. I had this exception when starting the application server.
I installed the Oracle JDK 6 (1.6.0_45) and the problem disappeared.
I assume it is worth trying something like this also in your case (check your JDK version as well as your JDK vendor).
I've just had the same exception using JBOSS 6.0.0.Final and a JDK 6.
The issue was the version of the JDK.
I first used OpenJDK 1.6.0_34. I had this exception when starting the application server.
I installed the Oracle JDK 6 (1.6.0_45) and the problem disappeared.
I assume it is worth trying something like this also in your case (check your JDK version as well as your JDK vendor).
hth
Olivier