public static boolean isClusteringStarted() {
        return CacheFactory.isClusteringStarted();
    }
Returns true if this JVM is part of a cluster. The cluster may have many nodes
or this JVM could be the only node.

@return true if this JVM is part of a cluster.
xmppserver/src/main/java/org/jivesoftware/openfire/cluster/ClusterManager.java