The redhat folks on here cringe when anyone brings this up. You're not suppose to mix community and enterprise jboss components. Since you have to use EAP, see if there are any EAP updates that are applicable.
It's not clear where your stack trace came from, the server hosting your service, or the vendors. Regardless, the ye ole' linker error is a class loading issue. It's telling you that there's an extra library somewhere that not suppose to be there. Look for anything releated to jax-b in the WEB-INF/lib of your app and remove it