public synchronized void start() {
try {
logger.info("Starting ProbeManager:");
if (numberUsers == 0) {
TestBedConfiguration config = TestBedConfiguration.getInstance();
List<String> l = config.getList("probe_manager.probe");
if (l != null) {
for (Iterator<String> i = l.iterator(); i.hasNext();) {
String probeName = i.next();
logger.info("Starting probe:" + probeName);