I've split the JBossMX project out of the JBossAS project.

The source can now be found here:
https://svn.jboss.org/repos/jbossas/projects/jbossmx/

The seperated JIRA project is here:
https://jira.jboss.org/jira/browse/JBMX

Issues relating to JBossAS management should still be posted in the JBAS project in JIRA.