We should not rely on the single "server/target/etc/deployers/metadata-deployer-jboss-beans.xml" list. Deployments should be self contained with proper jboss-scanning.xml (or whatever is necessary).

This comes from development forum email. Thread starts at http://lists.jboss.org/pipermail/jboss-development/2009-June/014537.html. Also see http://lists.jboss.org/pipermail/jboss-development/2009-June/014599.html + http://lists.jboss.org/pipermail/jboss-development/2009-June/014603.html