List<ConstraintViolationDTO> constraintViolationDTOs =
new ArrayList<ConstraintViolationDTO>();
if (validationException.getInvalidValues().isEmpty()) {
constraintViolationDTOs.add(new ConstraintViolationDTO(null,
validationException.getMessage()));
} else {
for (InvalidValue each : validationException
.getInvalidValues()) {
constraintViolationDTOs.add(toDTO(each));