Actually we are running ActiveMQ 5.4.0 in production although latest is 5.4.2 on that branch and 5.5.0 is now also available. http://activemq.apache.org/ https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12311210&version=12315623 Yet more "Java leaking memory" bugfixes by the look of it :-) -Peter