public void start() {
        if( started ) {
            return;
        }
        for( Service<T> s : services ) {
            if( log.isLoggable(Level.FINE) ) {
                log.log(Level.FINE, "Starting service:{0}", s);
            }
            s.start();
        }
        started = true;
    }
Starts this service manager and all services that it contains.
 Any services added after the service manager has started will have
 their start() methods called.
jme3-networking/src/main/java/com/jme3/network/service/ServiceManager.java