docs: public void activate() {
          super.activate();
          LOG.debug("Activating receipt of incoming messages");
  
          Class<?> serviceClass = endpointInfo.getProperty("serviceClass", Class.class);
          if (serviceClass != null && this.loader == null) {
              final ClassLoader cl = serviceClass.getClassLoader();
              LOG.debug("Using classloader {} obtained via endpointInfo serviceClass", cl);
              this.loader = cl;
          }
  
          if (engine != null) {
              UndertowHTTPHandler jhd = createJettyHTTPHandler(this, contextMatchOnExact());
              engine.addServant(nurl, jhd);
          }
      }