The bean org.jboss.ha.singleton.PreferredMasterElectionPolicy has an attribute preferredMaster which identified a process in a cluster which should be the master node in a clustered partition.

The preferred master attriubute is specified in the form host:port.
This format works fine for IPv4 addresses, but breaks down for IPv6 addresses unless the host part is surrounded with square brackets, according to rfc2732.

There are two places which above class may break:
in setting the preferred master attribute
(ii) in comparing ClusterNode instances using PreferredMasterElectionPolicy.find() to check if a given preferred master is in the current cluster.