code: protected InboxAmp createSystemInbox()
    {
      String path = getSystemAddress();
  
      StubAmpSystem actorSystem = new StubAmpSystem(path, this);
                                        
      //ServiceConfig config = ServiceConfig.Builder.create().build();
      //ServiceRefAmp serviceRef = service(actorSystem, path, config);
      ServiceRefAmp serviceRef = newService(actorSystem).ref();
      
      actorSystem.setInbox(serviceRef.inbox());
      
      serviceRef.bind(path);
  
      return serviceRef.inbox();
    }
docs: /*
  @Override
  public StubAmp createStub(Object bean, ServiceConfig config)
  {
  return createActor(null, bean, config);
  }
  
  @Override
  private StubAmp createActor(String path,
  Object bean,
  ServiceConfig config)
  {
  if (bean instanceof StubAmp) {
  return (StubAmp) bean;
  }
  else {
  return stubFactory().stub(bean, path, path, null, config);
  }
  }