One more observation, you seem to be creating the entity manager using the entity manager factory. Maybe there might be a problem there. But that does not explain why, the simple lookup of the datasource through a jsp returns null. Try this from a very simple jsp in your application: | <% | Properties props = new Properties(); | props.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory"); | props.put(Context.PROVIDER_URL,"jnp://localhost:1099"); | props.put(Context.URL_PKG_PREFIXES,"org.jboss.naming.jnp.interfaces"); | Context ctx = new InitialContext(props); | | Object obj = ctx.lookup("java:MySqlDS"); | | System.out.println("DS is = " + obj); | | %> I am suspecting that for some reason maybe the context properties are either not being picked up right or something else is going on. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4159493#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...