There are many testscases showing usage of ejb3 webservice endpoints in the jbossws testsuite, just take a look.
JSR109 is actually not supported with CXF, but that's most probably not an issue for you, as you'd use jaxws for the ejb3 endpoints.
Thanks a lot for your quick reply.
I need one more help. iam a bit confused over selecting WS Stack in JBoss. iam suggesting Metro Stack, but our architect is suggesting CXF. I have seen many WS Stack comparision charts. According to my opinion, metro will be providing more features than that of Native or CXF. Can you please suggest me in this regard.