Use of Binding result in Controller for particular input

[George Smithss]

I'm trying to validate an input parameter in the Controller with my custom validator and then use BindingResult to get validation results.
So I made ConstraintValidator and @interface "ValidatorCust" to call my own check. It runs like a charm with the model attributes. So its very convenient and concise to check errors with just binding result:

@PostMapping()
public String save (@Valid @ModelAttribute("goal")Goal goal
        ,BindingResult bindingResult) {
    if (bindingResult.hasErrors()) {
        return ERROR_TEMPLATE;
    }

But now I'm stuck with how to check an input parameter in controller.

The check runs fine and my restriction works right, but in further its not works as expected: I'm getting javax.validation.ConstraintViolationException with correct check result and then applications stops without any ability to just check Binding result.

@PostMapping()
public String save (@ModelAttribute("user") User user
        , @RequestParam (required = false) @Valid @ValidatorCust  String newPassword
        , RedirectAttributes redirect
        , BindingResult bindingResult) {
    if (bindingResult.hasErrors()) {
        ...
    }

After lots of reading I figured out that I can use @ExceptionHandler to override this, but it is verbose and no so convenient comparing to BindingResult's check. Another way I guess is just instantiate ValidatorFactory, Validator and then explicitly do check inside a Controller's code (as I take, explicit using of Spring's validator here is almost the same).

The question: is there any way to use Binding Result with input parameter validation (without sticking to model)? And if its not, which way for me is the best?

[Tim Nachreiner]

I was taught that the bindingResult parameter should always follow the parameter annotated with @Valid.  Might want to swap the order of your last two parameters.

[George Smithss]

Tim Nachreiner wrote:I was taught that the bindingResult parameter should always follow the parameter annotated with @Valid.  Might want to swap the order of your last two parameters.

Thank you, but it's not working

@PostMapping()
public String save (@ModelAttribute("user") User user
		, @RequestParam (required = false) @Valid @ValidatorCust String newPassword
		, BindingResult bindingResult
		, RedirectAttributes redirect) {
	if (bindingResult.hasErrors()) {
		System.out.println("Error has come!");
	}

Still

javax.validation.ConstraintViolationException

so I'm unable to use bindingResult.

[Himai Minh]

Hi, George,
I guess your input User has a duplicated ID that violates the DB constraint?

[George Smithss]

Himai Minh wrote:Hi, George,
I guess your input User has a duplicated ID that violates the DB constraint?

Hi. Thanks for your comment. I've checked uniqueness of ID attentively and there is no violation of DB constraint.

[Himai Minh]

Hi, George,
Is any attribute in the User violating the any constraints?