There is a new blogpost in the diary that discusses Extenders/Interceptors http://jbossosgi.blogspot.com/2009/10/extender-pattern-vs-lifecycle.html As far as integration with the MC Framework goes, you can add interceptors as part of the bootstrap config like this | <bean name="WebXMLVerifier" class="org.jboss.osgi.framework.deployers.WebXMLVerifierInterceptor"/> | Interceptors can of course also be added dynamically via the related LifecycleInterceptorService. In case of of the MC Framework the interceptor attachment API delegates to the DeploymentUnit, so that interceptor attachments are visible by the deployers and vice versa. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4262341#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...