After further investigation, adding grant { | permission java.security.AllPermission; | }; to the client machine's javaws.policy file allowed the property lookup. Unfortunately, this isn't a viable solution for us. What also confuses me is that the jnlp file for the web start application should grant full access to all jars. Can anyone think of why this isn't working for the jboss-messaging-client.jar? thank you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4010041#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...