But POJO's called from where? Inside an EJB? Inside a Servlet? I would imagine that this is a Servlet or you are in an EJB where you have specified no transaction. Otherwise JBoss would not let you do an explict commit using this type of datasource. Could you please be more specific about the exact environment in which you are running? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3965459#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...