Aside from the fact that i does not found the right jars for my client project, i found another discussion. I think, this is my problem, too, isn't it?! Please correct me, if i am on the wrong way.
http://community.jboss.org/thread/173385?tstart=0
So, i think, i am using JNDI lookup in my EJB and Client Application and it is still not supported in JBoss AS 7.0.2 (which i am using)?
Best Regards
hsch