Hi, This is likely due to the problem that the version of class on your client is different from server.
E.g. You call the EJB from a servlet, thus servlet is client. On your servlet, you will have some class of your EJB. If you make some changes to your EJB and redeploy your EJB, but didn't update your WAR app, your servlet will connect to the EJB expecting the old version of the class, and thus cause the Exception. You may wish to try to update both the EJB and WAR. Note that this is also common if you are using Hibernate. i.e. even though you have change some class in the mapping classes and you EJB using it has been updated, you still need to update the hibernate.sar for example. Hope this helps. Cheers. Han Ming View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3868758#3868758 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3868758 ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ JBoss-Development mailing list JBoss-Development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-development