HornetQServerAdd and HornetQServerService have integration with the JGroups subsystem in order to add a dependency on a ChannelFactory for use with broadcast and discovery groups. But it seems there is no testing of this integration.
At the time I filed this it was broken, due to
WFLY-3944, since fixed.
This JIRA is about the fact lack of testing that would have caught the
WFLY-3944 bug. Also, https://github.com/wildfly/wildfly/pull/6725 passed the testsuite with a code change that was binary incompatible with the version of HQ that was integrated at the time.