A ClusterMember object refers to the ServerProxy corresponding
to the managed server which is being member of a given cluster.
There may be several ClusterMember instances for the same ServerProxy object.
author: Philippe Durieux
The JOnAS server's name which is represented by the proxy, null if the memeber
is not connected to a proxy
the JOnAS server's name which is represented by the proxy throws: JMException - could not get serverName from the ServerProxy because of a JMX exception