[FIXED] Convert JSR-303 validation errors to Spring's BindingResult

Issue

I have the following code in a Spring controller:

@Autowired
private javax.validation.Validator validator;

@RequestMapping(value = "/submit", method = RequestMethod.POST)
public String submitForm(CustomForm form) {
    Set<ConstraintViolation<CustomForm>> errors = validator.validate(form);
    ...
}

Is it possible to map errors to Spring's BindingResult object without manually going through all the errors and adding them to the BindingResult? Something like this:

// NOTE: this is imaginary code
BindingResult bindingResult = BindingResult.fromConstraintViolations(errors);

I know it is possible to annotate the CustomForm parameter with @Valid and let Spring inject BindingResult as another method's parameter, but it's not an option in my case.

// I know this is possible, but doesn't work for me
public String submitForm(@Valid CustomForm form, BindingResult bindingResult) {
    ...
}

Solution

A simpler approach could be to use Spring's abstraction org.springframework.validation.Validator instead, you can get hold of a validator by having this bean in the context:

<bean id="jsr303Validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

@Autowired @Qualifier("jsr303Validator") Validator validator;

With this abstraction in place, you can use the validator this way, passing in your bindingResult:

validator.validate(obj, bindingResult);

Answered By - Biju Kunjummen
Answer Checked By - Mildred Charles (JavaFixing Admin)