OK found out where to configure jboss to use HSQL as a database, its in $JBOSS_HOME/server/default/deploy/ejb3.deployer/META-INF/persistence.properties correct me if I'm wrong. But is it really necessary to change that file! I thought its enough to change the persistence.xml in the booking example from create-drop to update. But unfortunately after restarting my server I can't login with my username and password which I registered earlier. Anyone has an idea?. thanks and best regards, Mussie View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117388#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...