I don't have a clear understanding right now, but it seems like a packaging issue.
Did you package any *jboss* class in your ear/jar, sometimes maven do this by accident.
Do you have a small example to share?
As you use EAP I suppose you have a subscription, in that case you might open a case in the portal.
Yes it is a packaging problem.
I resolved the ClassNotFound by adding all the needed modules to the jboss-deployment-structure.xml
<module name="org.jboss.as.clustering.service" export="true" />
<module name="org.jboss.as.clustering.singleton" export="true" />
<module name="org.jboss.msc" export="true" />
You should mark the answer as "correct", makes it easier for others