Is that becasuse I am using Context.INITIAL_CONTEXT_FACTORY with vaule of "org.jboss.security.jndi.JndiLoginInitialContextFactory", so if I dropped off jbossall-client.jar (including the classes from jnp-client.jar), it gave me error like the following: javax.ejb.CreateException,java.rmi.RemoteException javax.ejb.EJBException: Invalid invocation, check your deployment packaging ....... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4075364#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...