Indeed, but it only mentions non-JBoss clients. It reads: "In order to access JBoss Messaging from a client outside the JBoss app server, you will need to ensure the following jar files are on the client classpath" Since I was deploying on JBoss I expected everything was already on the classpath. As result, I guess my issue was caused by classloading scoping? Thank you View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258927#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...