Unfortunatelly there are no (MySQL) jdbc drivers included. Actually the list of included jars in the Glassfish runtime library cannot be compared the ones included in the JBOSS library: they are far less!! After inlcuding the MysQL library, i succefully reverse engeneered the entities and got "not resolved" issues (e.g org.hibernate). After excluding the MysQL library and including the JBOSS runtime library they went away. I also noticed that the jars included in JBOSS runtime library do not exist (and thus not interfear?? with the ones) in the Glassfish runtime library. So i could use them without affecting then project! Is this correct? Thanks again View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177236#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...