java - Spring BindingResult またはバリデーターにエラーが表示されないのはなぜですか?

Question

メールを含む Spring Bean を検証しようとしていますが、リクエスト Bean のメールが空の文字列の場合、バリデーターも BindingResult もエラーを表示しません。次のコードを参照してください。

豆：

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springmodules.validation.bean.conf.loader.annotation.handler.Email;
import org.springmodules.validation.bean.conf.loader.annotation.handler.NotEmpty;

@Component("grouponRedemptionFormBean")
@Scope("prototype")
public class GrouponRedemptionBean {

@NotEmpty(message = "Please enter your email addresss.")
@Email(message = "Please correct your email.")
private String  email;
   …
}

コントローラ：

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;


@Controller
public class GrouponVoucherRedemptionController {

@Autowired
@Qualifier("defaultBeanValidator")
private Validator validator;

@RequestMapping(value="/groupon-redemption.ep", method=RequestMethod.POST)
public String PostGrouponRedemption(@Valid @ModelAttribute GrouponRedemptionBean grouponRedemptionBean, BindingResult bindingResult,
HttpServletRequest request, HttpServletResponse response, Model model){

    Errors errors = new BeanPropertyBindingResult(grouponRedemptionBean, "grouponRedemptionFormBean");
    validator.validate(grouponRedemptionBean, errors);
    if(errors.hasErrors()) {
        bindingResult.addAllErrors(errors);
    }
    if (bindingResult.hasErrors()) {
        return GROUPON_REDEMPTION_VIEW;
    }    
...

XML 構成:

<mvc:annotation-driven />