@Transactional(readOnly = true, propagation = Propagation.SUPPORTS)
 @Override
 public List<ResponseDTO> getResponseByUser(String user) {
   List<JpaResponse> responseList = jpaSurveyDao.getResponseByUser(user);
   if (responseList == null) {
     return null;
   }
   return surveyMapper.toResponseList(responseList);
 }