Frank, I can see this point, but I have no control how the data source named and JNDI registered as they are from different products. All I can is let them tell my component what is their datasources and where are them. Now even I got these information, I have no way to inject into the EntityManagerFactory or Persistence layer. Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4137937#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...