Yes, I mean OS environmet. I have a project that contains a persistence.xml file. this file contains the database configuration including the username and password. For development, I would like to deploy this project in other machines using their owning JBoss (that is, each machine has its own AS). Instead of modifying the persistence.xml I would like to use an environment variable that defined in each machine. Thanks dyahav View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4186609#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...