use jbossws-cxf-client dependency and check dependency-tree:
http://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/EAP7/view/EAP7-WS/job/eap-7x-jbossws-cxf-client-dep-tree/25/

There is more then one jaxb-api artifact in dependency tree. Although they both should provide JAXB (JSR 222) API, I would expect only the jboss one to be used.

   |  \- javax.xml.bind:jaxb-api:jar:2.2.12:compile

   +- org.jboss.spec.javax.xml.bind:jboss-jaxb-api_2.2_spec:jar:1.0.4.Final-redhat-4:compile

See whole verbose dependency tree http://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/EAP7/view/EAP7-WS/job/eap-7x-jbossws-cxf-client-dep-tree/25/artifact/jbossqe-eap-tests-ws/jbossws-cxf-client/dependency-tree-5.1.2.Final-redhat-2-using-BOM-verbose.txt