hi timfox, You mean JBoss messaging is not suitable to HSQLDB. yes or no? I read the JBoss messaging user guide and Wiki page . I feel they said don't use HSQL in product env and do cluster env. Because it have limited support . Now our work env is standalone mode. my application works well, but it just has this Exception when I shut down the server. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217363#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...