Alright, I think I got a little bit further (I had a jboss class in my lib folder which apparently caused problems for jboss's own services, go figure...) But now my problem is that my webapp uses a datasource, but it can't find it because it seems that the web archive (which is in the .sar) is deployed before the datasource is registered. I can see the datasource in the JMX console so it gets deployed correctly (and it of course worked before I tried this .sar stuff). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4083658#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...