private void createFavourite(List<String> elements, List<RecipientFavourite> recipients, User u)
     throws BusinessException {
   for (String recipient : elements) {
     boolean contain = false;
     for (RecipientFavourite recipientFavour : recipients) {
       if (recipientFavour.getRecipient().equals(recipient)) {
         contain = true;
         break;
       }
     }
     if (!contain) {
       super.create(new RecipientFavourite(u, recipient));
     }
   }
 }