JBoss development, A new message was posted in the thread "CallbackItem.changeCallback() very expensive due to context tracking": http://community.jboss.org/message/527667#527667 Author : Ales Justin Profile : http://community.jboss.org/people/alesj Message: -------------------------------------------------------------- I would say a lot, as it's quite handy feature. e.g. Deployers are picked up this way   Other usage includes AnnotationPlugins, some Management objects, some JMS destinations, ... Apart from Deployers I doubt there are many instances that are picked up this way, but the feature makes sure they are transparently picked, not needing explicit install calls. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/527667#527667