"wolfc" wrote : "adrian(a)jboss.org" wrote : What you are describing is called "flow control". You can do it outside an EJB | | with an aspect, e.g. a semaphore controlling access to a singleton. | | | | If the semaphore/pool uses priority queuing the admin request | | can "jump the queue" based on a higher privilege. | A pool beats a semaphored singleton anytime. Obviously wrong. ;-) It makes no difference whether the semaphore is on the pool or the object, and the rest of the code is the same. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4136410#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...