Edit: Ok - forget to sync the databases in dvd-ds.xml and persistence.xml. Now i changed following files: dvd-ds.xml, persistence.xml and jboss-beans.xml to use my postgres DB. Now i get another exception - which confuses me, because the url is correct, and the driver class too - using this jdbc url and driver in another project, which works fine there. | Caused by: org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Apparently wrong driver class specified for URL: class: org.postgresql.Driver, url: jdbc:postgresql://localhost:5432/mydb) | and before that: | Caused by: org.jboss.resource.JBossResourceException: Failed to register driver for: org.postgresql.Driver; - nested throwable: (java.lang.ClassNotFoundException: No ClassLoaders found for: org.postgresql.Driver) | Included jdbc3-postgresql.jar in WEB-INF/lib directory of dvdstore example - anything else i have to do? kind regards View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3958870#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...