Deployers are there to deploy specific kinds of services, not necessarily related to MBeans. Most of them are surely documented at the JBoss documentation page at http://labs.jboss.com/portal/jbossas/docs. XMBeans are a special JBossian implementation of Dynamic MBeans. XMBeans always have a special XMBean-Descriptor, which can be inline in the MBean desciptor or in a separate file. Example: | <mbean code="org.jboss.logging.Log4jService" | name="jboss.system:type=Log4jService,service=Logging" | xmbean-dd="resource:xmdesc/Log4jService-xmbean.xml"> | With the additional attribute of xmbean-dd being present denominates the MBean as XMBean. As its value is not empty, the Descriptor is in the URL pointed to by the value. If it were empty, the XMBean-DD would be inline. -- Heiko W. Rupp <hrupp(a)jboss.com&gt; View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3976796#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...