JBoss has its own implementation of JAX-RPC which fits better way in JBOSS WAS stack.
The steps I have back often were:
1. Revise http://community.jboss.org/wiki/JBossWS-JAX-RPCUserGuide documentation.
2. Create config.xml file as stated in the documentation.
3. Edit my ant script to include the generation of files with wstools (JBoss WS)
4. Remove the jars from JAX-RPC for my WAR.
5. Test and deploy.