public synchronized static void clearCaches( String... cacheName )
    {
        caches.values().parallelStream()
            .filter(cache -> Arrays.asList(cacheName).contains(cache.getName()))
            .forEach(Map::clear);
    }
Returns a byte[] that uniquely identifies this member within the cluster or {@code null}
when not in a cluster.

@return a byte[] that uniquely identifies this member within the cluster or null when not in a cluster.
xmppserver/src/main/java/org/jivesoftware/util/cache/CacheFactory.java