docs: private static String serviceName(Class<?> serviceInterface) {
      // Service name
      Service serviceAnnotation = serviceInterface.getAnnotation(Service.class);
      requireNonNull(
          serviceAnnotation != null, String.format("Not a service interface: %s", serviceInterface));
      return isNullOrEmpty(serviceAnnotation.value())
          ? serviceInterface.getName()
          : serviceAnnotation.value();
    }