Question

I was using JSR 303 validation with hibernate validator to have fields validated automatically by specifying @Valid on the controller method. Validation was working fine. I have know added an upload field to the form and have added a @RequestParam(“file”) as a MultipartFile file. Now it works only if all fields are valid on submission otherwise I get a 404 (Bad Request). If I remove the @Valid annotation I get the javax.validation.ConstraintViolationException with all the validation violations with Status 500.

I’m using Spring 3.2

my form:

    <form action="#springUrl("/admin/stores/save")" method="POST" enctype="multipart/form-data">
Name: 
  #springBind( "store.name" )
  <input type="text" 
    name="${status.expression}" 
    value="$!status.value" /><br>
......
   <input type="file" name="file" accept="image/*">

  <input type="submit" value="submit"/>
</form>

Controller:

@RequestMapping(value="/save", method = RequestMethod.POST)
    @Transactional
    public String save(@Valid @ModelAttribute Store store, @RequestParam("file") MultipartFile file, BindingResult bindingResult, ModelMap model) {
        if (bindingResult.hasErrors()) {
            model.addAttribute("message", "Failed");
            model.addAttribute("store", store);
            return "admin/stores/form";
        } else {
                .....

Answer 1

your problem is in method argument order. @ModelAttribute must be followed by BindingResult argument. Look at Spring documentation and check also Example 17.1. Invalid ordering of BindingResult and @ModelAttribute.

. You also should add MultipartFile to form class (Store) if it is part of it.

Store {

    /* Your other fields */

    @NotNull
    private  MultipartFile file;

    public MultipartFile getFile() {
        return file;
    }

    public void setFile(MultipartFile file) {
        this.file= file;
    }
}