ValidationException vs ConstraintViolationException for validation

Question

I am trying to figure out which Exception ( ConstraintViolationException or ValidationException ) i have to used on @ControllerAdvice , .

My controller is

@RequestMapping(value="/myUrl",method = RequestMethod.POST)
    public String getMyData( @Valid @RequestBody MyObject myObject,BindingResult bindingResult ) {   

And this is my ControllerAdvice class and i am not sure which exception to use.

   @ControllerAdvice
    public class ValidationAdviceClass{
        @ExceptionHandler(ValidationException.class or ConstraintViolationException.class )
        public ResponseEntity handleValidtionErrors(ValidationException ex or ConstraintViolationException) {

       // mycode
}

Searching i found someone saying use MethodArgumentNotValidException

I am confused with which type of exception to use.

Answer 1

No exception is automatically thrown unless an error happened during the process of validation, for example (then a ValidationException would be thrown).

Any validation errors in your RequestBody would be passed to the BindingResult that you also have as a parameter of your function. Then it's up to you to decide if you want to throw an exception.

I suggest you read this Spring Tutorial about Validating Form Input to better understand how you can achieve what you want.