Spring Form Ajax Request + Hibernate Validation

Question

I always used @Valid and a BindingResult to validate form fields. Now using Ajax, based on this article, it's not possible to use BindingResult instead of or additional to HttpServletResponse because this would result in a Bad Request (HTTP Error Code 400).

How to validate my form fields now?

  @RequestMapping( value = "/save.html", params = "json", method = RequestMethod.POST )
  public @ResponseBody Map<String, ? extends Object> saveJSON( @RequestBody Location location, /* BindingResult result, */ HttpServletResponse response )
  {
    return Collections.singletonMap( "foo", "foobar" );
  }

This was the old way without ajax:

  @RequestMapping( value = "/save.html", method = RequestMethod.POST )
  public String save( @ModelAttribute( "location" ) @Valid Location location, BindingResult result, Map<String, Object> map )
  {
    Location l;
    if ( ( l = service.findByTitle( location.getTitle() ) ) != null )
    {
      if ( location.getId() != l.getId() )
      {
        result.addError( new FieldError( "location", "title", messageSource.getMessage( "Unique.location.title", null, null ) ) );
      }
    }

    if ( result.hasErrors() )
    {
      return "locationform";
    }

    service.save( location );
    return "redirect:/locations/index.html";
  }

EDIT

Tried this, but there's no errors member in result which contains true when leaving form unfilled (this should cause a @NotEmpty Constraint message)

  @RequestMapping( value = "/save.html", params = "json", method = RequestMethod.POST )
  public @ResponseBody Map<String, ? extends Object> saveJSON( @RequestBody Location location, HttpServletResponse response, Map<String, Object> map )
  {
    BindingResult result = new BeanPropertyBindingResult( location, "" );
    if ( result.hasErrors() ) map.put( "errors", true );
    map.put( "foo", "foobar" );
    return map;
  }

Which version of spring do you use 3.0 or 3.1?

Ralph
– Ralph

2012-02-12 19:17:36 +00:00
Commented Feb 12, 2012 at 19:17 — Ralph
– Ralph, Commented Feb 12, 2012 at 19:17

Moinul Hossain · Accepted Answer · 2012-02-14 02:32:55Z

Seems you are using hibernate validator. If so try this

in your Controller :

//other imports
import javax.validation.Validator;
@Controller()
class MyController{

    @autowire()
    @qualifier("myValidator")
    private Validator validator;
    public Validator getValidator() {
        return mValidator;
    }

    public void setValidator(Validator validator) {
        this.mValidator = validator;
    }

   @RequestMapping( value = "/save.html", params = "json", method = RequestMethod.POST )
   public @ResponseBody Map<String, ? extends Object> saveJSON( @RequestBody Location location, HttpServletResponse response )
   {
       Set<ConstraintViolation<Location>> errors = getValidator().validate(location);
       Map<String, String> validationMessages = new HashMap<String, String>();
       if(!errors.isEmpty())
       {
          //this map will contain the validation messages
          validationMessages = validationMessages(errors); 

          //probably you would like to send the errors back to client
          return validationMessages ;
       }
       else
       {
           //do whatever you like to do with the valid bean

       }
   }

   public Map<String, String> validationMessages(Set<ConstraintViolation<Location>> failures) {
        Map<String, String> failureMessages = new HashMap<String, String>();
        for (ConstraintViolation<Location> failure : failures) {

                failureMessages.put(failure.getPropertyPath().toString(), failure.getMessage());
        }
        return failureMessages;
    }



}

in your spring context file add the following bean

<beans:bean id="myValidator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

hope it helps :)

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