Did you find any solution to the above problem ? I am getting a similar exception while starting the server, with Jbossws-cxf. (i am using jboss eap 5.1.0 and trying to install jbossws-cxf 3.4.0 GA.
if you're a customer of a JBoss Platform product (JBoss Enterprise Application Platform EAP or JBoss SOA Platform) please got through your subscription channel / support contact and you'll get the proper update or patch for you. You're not supposed to manually change the productized JBossWS version in there and other community versions are likely not going to work. The bug mentioned here has been fixed in EAP 5.1.1 anyway.