@Override
 public MailingList findByUuid(String uuid) throws BusinessException {
   MailingList mailingList = listRepository.findByUuid(uuid);
   if (mailingList == null) {
     String msg = "The current mailing list do not exist : " + uuid;
     logger.error(msg);
     throw new BusinessException(BusinessErrorCode.LIST_DO_NOT_EXIST, msg);
   }
   return mailingList;
 }
 /** Mailing list contacts management. */
 @Override
 public MailingListContact findContactWithMail(String listUuid, String mail)
     throws BusinessException {
   MailingList list = listRepository.findByUuid(listUuid);
   MailingListContact contact = contactRepository.findByMail(list, mail);
   if (contact == null) {
     String msg = "The current contact you are trying to find do not exist : " + mail;
     logger.error(msg);
     throw new BusinessException(BusinessErrorCode.CONTACT_LIST_DO_NOT_EXIST, msg);
   }
   return contact;
 }