protected String listDomain() throws ServiceException {
    StringBuilder stringBuilder = new StringBuilder();
    List<String> domains =
        AppServiceFacade.getDomainService()
            .getDomainNamesWithHolderHandle(
                this.getHolderNicHandle(), this.userIdCaller, this.tldCaller);

    for (String domain : domains) {
      stringBuilder.append("DOMAIN=" + domain + this.separator);
    }

    return stringBuilder.toString();
  }