Thanks Tim. I change to blocking, the flow control seems a bit normal now. :) Now I comment out some of the code, the example now stops at the first seemingly security violation against the configuration. Now you will see the example shows that user frank can send messages to new.europe.europeTopic, which is against the security config, which says only 'europe-user' role can send messages, but frank doesn't belong to the role. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4227414#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...