In your client's classpath, you have an incorrect version of JBoss jar. Remove the existing JBoss related jars from the client's classpath and place the jbossall-client.jar (which is under %JBOSS_HOME%/client folder) in the client's classpath. Basically, the jars on the client side should be the same as what you have on the server where the EJB is deployed. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4131821#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...