Hi again... Yes I know that the spec says nothing about order. But still this behavior is strange. The pool size is set via annotations: @ActivationConfigProperty(propertyName="maxSession", propertyValue="1"), @ActivationConfigProperty(propertyName="maxMessages", propertyValue="1") }) I just wonder why its always twisting with 2 messages instead of 3 or 5 or any higher number. If I can force this to 1 consumer its exacly what my customer need. :-) Greets View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4159525#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...