Wow, I was on my co-worker's computer and he had a japanese-translated keyboard. That was why it shows up as question marks. Here is my question again (sorry!!) : Is there a way to dynamically add or remove persistence units from the persistence.xml file? My application is built on top of a system that lets end-users add or remove databases dynamically so there can theoretically be an infinite amount of datasources and persistence units. I have not found any kind of feasible way of doing this using the persistence layer. Please advise. -Confused and Bewildered- View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074640#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...