"gena777" wrote : Couldn't it be better, to purge the dirty SLSB and from some threshold to fill the pool with new instances? You can create your own interceptor which determines if you use a new instance and when to discard it. See http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas/trunk/ejb3/src/main/or... "gena777" wrote : Are there some important reason why the SLSBs aren't one way? Is it really so expensive, to create asynchronously thousands of whole instances of a bean and put them on demand to the method-ready pool? Yes and yes. Injection can become quit heavy. But each application is different, you'll have to benchmark when you got your new interceptor up and running. "gena777" wrote : Isn't the throwing an exception an expensive way to remove the dirty instance? Yes, if you want open a new feature issue in JIRA. An extension of SessionContext with a setDiscard method might be the solution. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4061842#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...