java – Spring mvc表单错误没有在jsp上进行过

我正在尝试验证登录表单.单击登录按钮后,控件进入我的控制器类,并在BindingResult的帮助下,我也知道我的字段有错误,但我无法在我的jsp页面上显示错误.我已经尝试过rejectValue方法,但是我的jsp页面抛出异常,即属性不可读e.t.c

这是我的模特课.

public class UserBean
{
  @NotEmpty
  private String username;
  @NotEmpty
  private String password;

  public String getPassword()
  {
    return this.password;
  }

  public String getUsername()
  {
    return this.username;
  }

  public void setUsername(String username)
  {
    this.username = username;
  }

  public void setPassword(String password)
  {
    this.password = password;
  }  
}

这是我的JSP页面.

<form:form method="POST" modelAttribute="login-entity"
    action="process-login.html">
    <table>
        <tr>
            <td><form:label path="username">username:</form:label></td>
            <td><form:input path="username" /></td>
            <td><form:errors path="username" /></td>
        </tr>
        <tr>
            <td><form:label path="password">password:</form:label></td>
            <td><form:input path="password" /></td>
            <td><form:errors path="password" /></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="Login" /></td>
        </tr>
    </table>
</form:form>

这是我的控制器类.

@RequestMapping(value = "/process-login",method = RequestMethod.POST)
  public ModelAndView processLogin(@Valid UserBean loginModel,BindingResult bindingResult,Model model)
  {
    if(bindingResult.hasErrors())
    {
      ModelAndView errorView = new ModelAndView("loginpage");
      bindingResult.rejectValue("username","invalid username");
      bindingResult.rejectValue("password","invalid password");
      errorView.addObject("login-entity",bindingResult.getModel());
      return errorView;
    }
    return new ModelAndView("redirect:/some_other_page","","");
  }

在调试时,我的最终错误视图对象包含这个东西.

ModelAndView: reference to view with name 'loginpage'; model is {login-entity={userBean=UserBean [userId=0,username=,password=],org.springframework.validation.BindingResult.userBean=org.springframework.validation.BeanPropertyBindingResult: 4 errors
Field error in object 'userBean' on field 'username': rejected value []; codes [NotEmpty.userBean.username,NotEmpty.username,NotEmpty.java.lang.String,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [userBean.username,username]; arguments []; default message [username]]; default message [may not be empty]
Field error in object 'userBean' on field 'password': rejected value []; codes [NotEmpty.userBean.password,NotEmpty.password,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [userBean.password,password]; arguments []; default message [password]]; default message [may not be empty]
Field error in object 'userBean' on field 'username': rejected value []; codes [invalid username.userBean.username,invalid username.username,invalid username.java.lang.String,invalid username]; arguments []; default message [null]

有人可以帮忙吗？我想我错过了一些非常基本的东西.