Not showing error messages when validated using @valid(JSR-303) in Spring MVC

In your controller handler method, make sure that the BindingResult argument is immediately after the command argument.

You should explicitly decide what to do with validation errors:

@RequestMapping(method = RequestMethod.POST, value = "new") 
public String save(@Valid Article article, BindingResult result, ModelMap model) { 
    if (result.hasErrors())
        return "formView";