I had this same problem with MySQL 5. There seems to be some sort of configuration issue with the file "deploy/messaging/xxxx-persistence-service.xml" There is a section for configuration of clustering | <mbean code="org.jboss.messaging.core.jmx.MessagingPostOfficeService" | name="jboss.messaging:service=PostOffice" | xmbean-dd="xmdesc/MessagingPostOffice-xmbean.xml"> | | .... | | <!-- This post office is non clustered. If you want a clustered post office then set to true --> | | <attribute name="Clustered">false</attribute> | | .... | | </mbean> | What worked for me was deleting everything between <attribute name="Clustered">false</attribute> and </mbean> The file explicitly states that attributes after only matter if it is set to true and that they can safely be commented out otherwise. Hope this helps someone - I certainly wasted enough time on this issue... Ben Wright ben [at] compuwares.cc View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4256238#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...