I figured it out myself.
There were some dependency issues due to the fact I customized the jboss distribution for using jaxws-ri 2.1.4.
This caused org.jboss.switchboard.WebServiceRefResourceProvider and org.jboss.switchboard.WebServiceContextResourceProvider gone missing causing the switchboard jndi resource provider also gone missing obviously causing my blowup.
Kind regards,
Wim.