I don't see anything here to lead me to believe this a Hibernate issue. It sounds like your datasource is configured in Websphere, I would double check those configurations, and triple check the URL. Do you have Authentication=Container? Did you try restarting dmgr? How is your application getting a handle to the datasource is this exposed through JNDI and configured in Spring? You can post more of your hibernate configuration after verifying the other stuff I just suggested, but this question may be better suited as a configuration question in the websphere forum.