Sorry!!! This is a stupid mistake! I forget establish the dependece between my web tier and my ejb tier in Eclipse. Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4133448#4133448 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4133448