I am, so I am not sure what the deal is. I am trying to follow the tutorial at http://docs.jboss.org/ejb3/app-server/tutorial/stateless/stateless.html. I have created an EJB Project (which also generated a Client and and EAR project), under ejbModule I created all the src files, but when I right click on the EAR and Run As -> Run on Server and choose my 4.2.4 server and run the server I get the following error: Problem creating service jboss.j2ee:service=EJB3,module=TestWebApp.jar java.lang.classNotFoundException: Unexpected error during load of: org.jboss.tutorial.stateless.bean.CalculatorBean, msg=Bad version number in .class file ... Caused by: java.lang.UnsupportedClassVersionError: Bad version number in .class file ... I am sure that I am doing something stupid, but being that this is my first attempt at EJB 3 in eclipse (or anywhere for that matter) I don't know what I missed. Any suggestions? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140986#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...