有关webwork输入校验的问题

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最近看到了webwork输入校验,相关代码如下：
LoginAction.java代码

import com.opensymphony.xwork.ActionSupport;
......
public class LoginAction extends ActionSupport implements Action, ModelDriven {
    private final static String LOGIN_FAIL="loginfail";
    LoginInfo loginInfo = new LoginInfo();

    public String execute() throws Exception {
       if ("erica".equalsIgnoreCase(loginInfo.getUsername())  && "mypass".equals(loginInfo.getPassword())) {
           return SUCCESS;
       } else {
           System.out.println("=======================================================");
           return LOGIN_FAIL;
       }
   }
   public Object getModel() {
       return loginInfo;
   }
}

LoginAction-validation.xml和LoginAction.java在同一个目录下
LoginAction-validation.xml代码

＜!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWorkValidator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd"＞
＜validators＞
 ＜field name="model.username"＞
  ＜field-validator type="requiredstring"＞
   ＜message＞Please enter Username!＜/message＞
  ＜/field-validator＞
 ＜/field＞

 ＜field name="model.password"＞
  ＜field-validator type="stringlength"＞
   ＜param name="minLength"＞4＜/param＞
   ＜param name="maxLength"＞6＜/param＞
   ＜message＞Password length must between ${minLength} and ${maxLength} chars!＜/message＞
  ＜/field-validator＞
 ＜/field＞
＜/validators＞

xwork.xml代码

＜!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.0//EN"
"http://www.opensymphony.com/xwork/xwork-1.0.dtd"＞
＜xwork＞
 ＜include file="webwork-default.xml" /＞
 ＜package name="default" extends="webwork-default"＞

  ＜interceptors＞
   ＜interceptor-stack name="modelParamsStack"＞
    ＜interceptor-ref name="params" /＞
    ＜interceptor-ref name="model-driven" /＞
   ＜/interceptor-stack＞
  ＜/interceptors＞

  ＜action name="login" class="net.xiaxin.webwork.action.LoginAction"＞
   ＜result name="success" type="dispatcher"＞
    ＜param name="location"＞/main.jsp＜/param＞
   ＜/result＞
   ＜result name="loginfail" type="dispatcher"＞
    ＜param name="location"＞/validatorindex.jsp＜/param＞
   ＜/result＞
   ＜interceptor-ref name="modelParamsStack"/＞
   ＜interceptor-ref name="validationWorkflowStack" /＞
  ＜/action＞
 ＜/package＞
＜/xwork＞

validators.xml和xwork.xml都放在classes根目录下

validators.xml代码

＜validators＞
    ＜validator name="requiredstring" class="com.opensymphony.xwork.validator.validators.RequiredStringValidator"/＞

    ＜validator name="stringlength" class="com.opensymphony.xwork.validator.validators.StringLengthFieldValidator"/＞

＜/validators＞

validatorindex.jsp代码

＜%@ taglib prefix="ww" uri="/webwork"%＞
 ＜style type="text/css"＞
  .errorMessage {
   color: red;
  }
 ＜/style＞
  ＜form action="login.action"＞
    登录＜br＞
   ＜ww:if test="hasFieldErrors()"＞
    ＜span class="errorMessage"＞
     ＜b＞Errors:＜/b＞＜br＞
     ＜ww:iterator value="fieldErrors"＞
      ＜li＞＜ww:property value="value[0]"/＞＜/li＞
     ＜/ww:iterator＞
    ＜/span＞
   ＜/ww:if＞
  用户名:
  左尖括号  input type="text" name="model.username" /＞

  密 码 :
  左尖括号 input type="password" name="model.password" /＞

   左尖括号 input type="submit" value="提交" name="B1"/＞
   左尖括号 input type="reset" value="重置" name="B2"/＞
 ＜／form＞

运行时，若输入正确的用户名和密码，按提交按钮后可以转向正确的页面。若输入错误的用户名或密码，按提交按钮则页面空白一片。在myeclipse下看到如下信息：
DefaultWorkflowInterceptor - Invoking validate() on action net.xiaxin.webwork.action.LoginAction@a47cc3
PrefixMethodInvocationUtil - cannot find method [validateExecute] in action [net.xiaxin.webwork.action.LoginAction@a47cc3]
PrefixMethodInvocationUtil - cannot find method [validateDoExecute] in action [net.xiaxin.webwork.action.LoginAction@a47cc3]
DefaultWorkflowInterceptor - Errors on action net.xiaxin.webwork.action.LoginAction@a47cc3, returning result name 'input'
DefaultActionInvocation - No result defined for action net.xiaxin.webwork.action.LoginAction and result input
这是什么原因呢？