if (sub == null) {
sub = new OnMessageSubscriber(this.getUseJNDIPropertiesAsBoolean(), this.getJNDIInitialContextFactory(),
this.getProviderUrl(), this.getConnectionFactory(), this.getTopic(), this.isUseAuth(), this
.getUsername(), this.getPassword());
sub.setMessageListener(this);
sub.resume();
ClientPool.addClient(sub);
ClientPool.put(this, sub);
log.debug("SubscriberSampler.initListenerClient called");
log.debug("loop count " + this.getIterations());
}