Description of problem: In the messaging configuration, the backup-group-node modelNode is passed directly to the HornetQ configuration without checking whether it is defined. If it is not undefined, the hornetq configuration will use the "undefined" string as the backup group name instead of returning a null value Expected results: If the backup-group-name is undefined, nothing must be set on the HornetQ configuration
PR for jboss-eap https://github.com/jbossas/jboss-eap/pull/839
Verified by review the code in EAP 6.3.0.DR0.