code: public String getAbsoluteSelfRegistrationPath() {
      if (selfRegistrationPath == null) {
        return null;
      }
      String root = registryOperations.getConfig().getTrimmed(
          RegistryConstants.KEY_REGISTRY_ZK_ROOT,
          RegistryConstants.DEFAULT_ZK_REGISTRY_ROOT);
      return RegistryPathUtils.join(root, selfRegistrationPath);
    }
docs: Get the absolute path to where the service has registered itself.
  This includes the base registry path
  Null until the service is registered
  @return the service registration path.