Question

I am using Spring validation(JSR 303) in one of the web apps.I have no issues when a user submits data and spring validation works pretty neat.But I have a scenario where I have to fetch data from a service and validate it and then bind them to my view.(something non-form validation).How can I use @Valid in this case or does it have to be done differently?

Here is a sample code,i started with

    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
public ModelAndView getView(
        @PathVariable("id") final String id, @User user,
        HttpSession session) {

    User user=  getUser();

   BindingResult result = new BeanPropertyBindingResult(user, "user");

   validator.validate(user, result);

   if(result.hasErrors()){
       logger.log(Level.ERROR, "Errors");
   }

  ModelAndView view = new ModelAndView ("home");
  view.addObject("user",user );
  view.addAllObject(result.getModel());

   return view;

Answer 1

As far as I understand you need to inject default org.springframework.validation.Validator into your controller (if @Valid works you should be able to do it)

@Autowired
Validator validator;

run validation manually as follows

User user = ...;
BindingResult result = BeanPropertyBindingResult(user, "user");
validator.validate(user, result);

and merge results into ModelMap (declare it as argument of your method) as follows

model.addAllAttributes(result.getModel());