使用ControllerAdvice进行不确定性的Spring Boot验证

Question

I have the following setup

@ControllerAdvice
public class AppControllerAdvice extends ResponseEntityExceptionHandler {

    @ExceptionHandler({UserInputValidationException.class})
    public ResponseEntity<UserInputValidationResponseBody> handleBadInputException(UserInputValidationException ex, WebRequest request) {
        return new ResponseEntity<>(
                new UserInputValidationResponseBody().setFieldErrors(ex.getFieldErrors()),
                HttpStatus.BAD_REQUEST
        );
    }

}

This is roughly the @RestController that throws well formatted validation exceptions

@RestController
@RequestMapping("api")
public class MyController {


/**
per the answer, BindingResult must immediately follow the @RequestBody or the item being found
*/
    @PostMapping
    public ResponseEntity<?> foo(@Valid @RequestBody FormPOJO formBody, Principal principal, BindingResult bindingResult) {
        // if bindingResult has errors, throw a UserInputValidationException
    }
}

And POJOs that I want to bind have JSR-303 validation annotations on them, Spring correctly validate them at Bind time during request parameter binding

However ... while I got this setup to work for a while - then Spring randomly started to bypass the @RestController and @ControllerAdvice

It appears that now I am receiving org.springframework.web.bind.MethodArgumentNotValidException ... ie the request is getting short circuited

I am running Spring Boot 1.5.4.RELEASE ...

EDIT following suggestion from another thread , I added

@Order(Ordered.HIGHEST_PRECEDENCE)

to the controller advice ... it only served to make matters worse. now there is absolutely no validation errors - the client only receives a blank message (which was the symptom of the problem for a while before the current issue surfaced without any code changes)

Answer 1

Ok it turns out

An Errors/BindingResult argument is expected to be declared immediately after the model attribute, the @RequestBody or the @RequestPart arguments to which they apply: public org.springframework.http.ResponseEntity com.remo.api.portfolios.PortfolioController.put(java.security.Principal,org.springframework.validation.BindingResult,com.remo.api.portfolios.Portfolio

tl;dr Please go ahead and make sure @RequestBody is declared IMMEDIATELY before BindingResult