I would like to deploy 2 ears on the same JBoss 3.0 server, each of them containing a different version of the same classes. The issue is that once the first ear is deployed, the second ear can not retrieve its own version the classes : it retrieves the version of the first ear. I thought jboss-app.xml was made to resolve this problem by loading the ears with 2 different class loaders and then, allowing us to use 2 different versions of the same classes. But, it doesn't seem to work. Can somebody help me ?