private static boolean isClustered() {
Domain domain = Globals.get(Domain.class);
Clusters clusters = domain.getClusters();
if (clusters == null) return false;
List clusterList = clusters.getCluster();
ServerContext serverctx = Globals.get(ServerContext.class);
return JmsRaUtil.isClustered(clusterList, serverctx.getInstanceName());
}