bean validation working but empty message on Kotlin

Question

I'm trying to get Kotlin working with bean validation on spring-webflux project.
Requests seems to be validated properly, but message of a response body is empty, so it's difficult to know the cause of error.

Hot to get a default validation message from responses?

Controller:

class SomeController {
    @PostMapping("/foo")
    fun foo(@Valid @RequestBody body: FooRequest): Mono<FooRequest> {
        return Mono.just(body)
    }
}

Request:

data class FooRequest(
    @field:Min(0)
    val bar: Int
)

The response of calling that api with the request "{\"bar\":-1}" is

{
  "timestamp": "2021-03-23T02:18:49.368+00:00",
  "path": "/api/v1/foo",
  "status": 400,
  "error": "Bad Request",
  "message": "",
  "requestId": "d1739c79-6"
}

I'm curious f you put a custom message in the annotation does it come thru? If it does it proves the annotation is the issue, otherwise something else. — DCTID
– DCTID, Commented Mar 23, 2021 at 3:19
@DCTID Even though I set a custom message, the response doesn't show that. — shota hizawa
– shota hizawa, Commented Mar 24, 2021 at 8:25

Hani Naguib · Accepted Answer · 2021-03-24 04:43:10Z

1

So after reading this https://www.baeldung.com/spring-boot-bean-validation

I ended up adding an exception handler like this:

@ExceptionHandler(MethodArgumentNotValidException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
public ResponseEntity<Map<String,String>> handleMethodArgumentNotValidException(MethodArgumentNotValidException exception) {
    Map<String, String> errors = new HashMap<>();
    exception.getBindingResult().getAllErrors().forEach((error) -> {
        String fieldName = ((FieldError) error).getField();
        String errorMessage = error.getDefaultMessage();
        errors.put(fieldName, errorMessage);
    });
    return ResponseEntity
            .status(HttpStatus.BAD_REQUEST)
            .body(errors);
}

answered Mar 24, 2021 at 4:43

Hani Naguib

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