I think you need to add jnp-client.jar to class path when you run the client. The file is located in jboss-home/client. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077721#4077721 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4077721