Validation Spring

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When performing Spring MVC validation, the location of the BindingResult parameter is very important. In the method signature, the BindingResult parameter must immediately after the model attribute.
If you place it in any other location, Spring MVC validation will not work as desired. In fact, your validation rules will be ignored.

        @RequestMapping("/processForm")
        public String processForm(
                @Valid @ModelAttribute("customer") Customer theCustomer,
                BindingResult theBindingResult) {
            ...            
        }

Here is the relevant section from the Spring Reference Manual

---

Defining @RequestMapping methods



















@RequestMapping handler methods have a flexible signature and can choose from a range of supported controller method arguments and return values.

...



The Errors or BindingResult parameters have to follow the model object that is being
bound immediately ...

Source: https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-ann-methods












































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