Thanks Peter. Well, my deployer is just a bit of playing around, so I won't loose much if I had to rewrite it ;-). Currently, it seems that it won't work. Updating an EAR file is impossible because the server keeps the file handle open, even if it undeployed. Anyway, the JBoss developers will have a concept of a JBoss 5 server, so I hope that someone of them reads this post. Wolfgang View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4103854#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...