How to do Bean Validation with Hibernate Validation in Spring Boot app?

Question

I\'m learning about Hibernate Validation in a Spring Boot app and I have a Rest controller and a POST method. And when I make a request, if a field isn\'t validated successfully

Answer 1

You would either have to create a ControllerAdvice method that handles MethodArgumentNotValidException, the error thrown by hibernate validator, like in this example:

    @ResponseStatus(BAD_REQUEST)
    @ResponseBody
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public CustomError methodArgumentNotValidException(MethodArgumentNotValidException ex) {
        BindingResult result = ex.getBindingResult();
        List<org.springframework.validation.FieldError> fieldErrors = result.getFieldErrors();
        return mapToCustomError(fieldErrors);
    }

or you can inject BindingResult in your controller method and check whether validation failed in there:

    @PostMapping("/ibantoiban")
    public ResponseEntity<String> sendMoneyIbanToIban(@Valid @RequestBody IbanToIbanRequest ibanToIbanRequest, BindingResult bindingResult) {
        if (bindingResult.hasErrors()) { /** handle error here */ }
        Transaction transaction = transactionService.sendMoneyIbanToIban(ibanToIbanRequest);

        HttpHeaders headers = new HttpHeaders();
        headers.add("Location", "/ibantoiban" + transaction.getTransactionId().toString());
        return new ResponseEntity(headers, HttpStatus.CREATED);
    }