private void enableVirtualServerMonitoring(VirtualServer vs){
ServerContext sc = getServerContext();
ConfigContext cc = sc.getConfigContext();
MonitoringRegistry monitoringRegistry = sc.getMonitoringRegistry();
PWCVirtualServerStatsImpl vsStats = new PWCVirtualServerStatsImpl(vs);
try {
monitoringRegistry.registerPWCVirtualServerStats(vsStats,
vs.getID(),
null);
} catch (Exception e) {