Spring MVC Validate form and return data if has errors

Question

I can successfully validate my form and even return the errors. My problems started when my view had a few selects that needed to be populated with the data coming from the controller.

When i do model.addAttribute(...) it stops passing the errors to the view:

 public String registerSubmit(@Valid @ModelAttribute("jconcorrente") Jconcorrentes concorrente, BindingResult result, HttpServletRequest request, Model model){

         if(result.hasErrors()) {
             model.addAttribute("listJdistrito", this.jdistritoService.listJdistrito());
             model.addAttribute("listJtipocodiden", this.jtipodocidenService.listJtipodociden());
             model.addAttribute("jconcorrente", new Jconcorrentes());
                return "register";
            }

So my question is how can i pass the data without affecting the validation errors?

Try to remove model.addAttribute("jconcorrente", new Jconcorrentes()); from your if. — Paulius Matulionis
– Paulius Matulionis, Commented Jul 6, 2015 at 11:40
If i do that it passes the errors but my selects don't get populated... — Kunal
– Kunal, Commented Jul 6, 2015 at 11:43

Paulius Matulionis · Accepted Answer · 2015-07-06 12:01:29Z

1

My guess is that your errors aren't getting populated because you are adding new instance of your model attribute directly into the model.

Try to remove this line:

model.addAttribute("jconcorrente", new Jconcorrentes());

from your if statement and create new method like this:

@ModelAttribute("jconcorrente")
public Jconcorrentes getJconcorrentes() {
    return new Jconcorrentes();
}

Leave everything else the same and it should work.

answered Jul 6, 2015 at 12:01

Paulius Matulionis

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2 Comments

Kunal Over a year ago

Thank you that solved it. But i'm guessing this will always add an ModelAttribute("jconcorrente") for each method i have defined in my controller. Right? Is it possible to do this conditionally (only in the required methods)?

Paulius Matulionis Over a year ago

No it won't add it in each method, you also have to sepcify ModelAttribute("jconcorrente") in the method.

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