I couldn't find similar topic so I am opening a new one. I have an ejb.jar. Inside it I have one stateless bean. The bean interface is putted in separate jar - ejb-interface.jar. I am using maven and it packages the both jars inside ear.jar +ear.jar +ejb.jar +ejb-interface.jar No I am trying to deploy the ear on jbos-4.2.1GA and I got the following exception:a 15:04:15,562 WARN [ServiceController] Problem starting service jboss.j2ee:service=EJB3,module=ejb.jar java.lang.NoClassDefFoundError: "The path to the interface". Why it does not find the interface? I can not find where is the problem? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080476#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...