"Hilwi" wrote : | I created another ejb-jar named OpenJbs_EJB.jar now that only contains the persistence.xml with the jar-files to scan: | This need not be an EJB jar. It can be a simple jar file and in the application.xml file you can map it as a java module instead of an ejb module: | <module> | <java>OpenJbs_EJB.jar</java> | </module> | "Hilwi" wrote : | This seems not to be a very clean solution to me because the OpenJbs_EJB.jar is just a dummy. Isn't it possible to put the persistence.xml elsewhere? As far as i know, this is the only way to have multiple jars containing the entities, all belonging to a single persistence unit. In your case, you had to create the dummy jar because you are planning to use the modules across multiple applications. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4143775#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...