DTO na
private String dealerMaster;
    private String dealerSub;

    private DataStatus dealerStatus;
    private CreationalSpecificationDTO dealerCreationalDTO;


REST na

@RequestMapping(value = "/update.dealer.group.mapping/{dealerMaster}",
            method = RequestMethod.POST,
            consumes = MediaType.APPLICATION_JSON_VALUE,
            produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<DealerGroupMappingDTO> updateDealerGroupMapping(@RequestBody DealerGroupMappingDTO dto, @PathVariable("dealerMaster") String dealerMaster) throws CustomException {
        DealerGroupMapping dealerGroup = (DealerGroupMapping) repo.findDealerGroupMappingByMaster(dealerMaster);
        if(dealerGroup == null){
            String message = env.getProperty("data.not.found.message");
            message = MessageFormat.format(message, dto.getDealerMaster());
            throw new CustomException(new DealerGroupMappingDTO(), message, HttpStatus.NOT_FOUND);
        }
        dealerGroup.setDealerMaster(dealerMaster);
        dealerGroup.setDealerSub(dto.getDealerSub());
        dealerGroup.setDataStatus(DataStatus.ACTIVE);
        try{
            repo.save(dealerGroup);
        }catch(ConstraintViolationException ex){
            throw new CustomConstraintViolationException(ex.getMessage(), ex.getConstraintViolations(), new DealerGroupMappingDTO());
        }catch(DataIntegrityViolationException ex){
            throw new CustomDataIntegrityException(ex, ex.getMessage(), new DealerGroupMappingDTO());
        }
        return ResponseEntity.status(HttpStatus.CREATED).body(new DealerGroupMappingAssembler().toDTO(dealerGroup));
    }