Question

In Spring MVC I have the following controller:

@RequestMapping(value="adminUsers", method = RequestMethod.POST) 
public ModelAndView listAdminUsers(Person newPerson,  HttpServletResponse response)  throws Exception {
Person person = personService.findPerson(newPerson.getUsername());
if (person == null) {
    // Set errorText = "Invalid Person";
    // redisplay view
    ModelAndView mav = new ModelAndView("adminUsersList");
    return mav;
} else {
    Roles roles = new Roles();
    roles.setPersonCode(person.getPersonCode());
    roles.setRoleType("ADMN");
    rolesMapper.insert(roles);
    return new ModelAndView("redirect:/admin/adminUsers.html");
} 
}

With the view:

    <form:form method="post" action="${action}" commandName="person" >
    <form:label path="username">Add new administrator:</form:label>
    <form:input path="username" size="20"/>
    <form:errors path="username" />
    <input type="submit" value="Submit Changes"/> </form:form>

How would I return an error back to the view, so it is displayed by the <form:errors path="username" /> tag?

This is simlar to How to return error status and validation errors from this Spring MVC controller? except I’m returning a webpage, not a REST object, so the answers there don’t apply.

I don’t want to use Validator because the above calls the database, it’s not simply a check for if username is not empty etc.

Thanks!

Answer 1

Add BindingResult to your method signature. From there, bindingResult.rejectValue("username", "username.notvalid", "Username is not valid");