There are no expected listeners, its just part of the jmx management interface to emit notifications when class loaders are added/removed from a repo. I do see that there is a org.jboss.aop.deployment.LoaderRepositoryUrlUtil class referencing the CLASSLOADER_ADDED/CLASSLOADER_REMOVED event types to track some internal sequence number, but that is the only explicit usage in the 4.2 codebase I can find. In the past there were thoughts about using these notifications to handle implicit deployment dependencies based on usage of a class from the repository, but this was never fleshed out. I don't see a problem with wrapping the class loader in a WeakReference to avoid the jmx layer being a strong referent. NotificationListeners would have to be aware that the Notification user data has changed to a WeakReference. This could be added as an optional behavior based on a system property. Notification emission could also be disabled altogether as well based on this property. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4075944#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...