Classloading issue with a CDI extension which use a library provided by the Application Server

I've developed a CDI extension which provides some functionality for Infinispan. If I use the provided version of Infinispan I've got the following exception http://pastebin.com/F0sUsFHX.

If I add the following dependencies to the Infinispan module all works fine.

• org.jboss.interceptor
• org.javassist