The new reference guide chapter I wrote uses weblogic 10.x so I do not believe this is an issue on 10. Some things to try: Clean out the "deployed apps directory" on 10 it was @BEA_HOME/user_projects/domains/<your-domain>/servers/<your-sever>/tmp/_WL_user" directory. Make sure the server is down and then delete your application there and restart. Also try to deploy the JPA example using the weblogic 92 build. If there are issues with that you could attempt to deploy the weblogic 10 version, but you would need to change the servlet version to 2.4 in the web.xml. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120194#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...