anonymous wrote : org.jboss.util.NestedSQLException: Could not create connection; - nested | throwable: (org.jboss.resource.JBossResourceException: Apparently wrong driver class specified for URL: class: oracle.jdbc.driver.OracleDriver, url: jdbc:oracle:thin:@srv06:1521:training This error occurs when you have the connection URL incorrect (I don't remember exactly, but i think it even appears when the driver jar is not placed in the %JBOSS_HOME%\server\< serverName>\lib folder). I don't know how it starts working without changing anything. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4173864#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...