Thanks that helped. I found that I also had to edit the ejb3-inteceptors-apo.xml file. There was a point cut that needed changing: <annotation expr=&quot;!class((a)org.jboss.annotation.ejb.PoolClass)&quot;&gt; | @org.jboss.annotation.ejb.PoolClass (value=org.jboss.ejb3.StrictMaxPool.class, maxSize=30, timeout=10000) | </annotation> | However, there still seems to an upper limit of only 99 MDB instances. Despite changing any of the aforementioned properties. Do you know how to get past this limit? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4250222#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...