struts的Validdate的问题。

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struts的Validdate的问题。5

当我把validate框架在struts中配好之后运行，并没有出现我想要的提示，而是出现一个空白页。
这是一个登录的窗体，想测试一下用户名必填，如果不填在该页上提示信息。
下面我把相应的配置与类贴出。
struts-config配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">

<struts-config>
<form-beans>
<form-bean name="loginForm" type="com.cchd.form.LoginForm"/>
</form-beans>

<action-mappings>
<action name="loginForm" path="/login" input="/index.jsp" scope="request"
type="com.cchd.action.LoginAction" validate="true">
<forward name="sucess" path="/main.jsp"></forward>
</action>
</action-mappings>
<message-resources parameter="ApplicationResources"></message-resources>

<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"
property="pathnames" />
</plug-in>

</struts-config>

formbean如下：
public class LoginForm extends ValidatorForm {
/**
*
*/
private static final long serialVersionUID = 1455009705367572463L;

private String username = "";

private String password = "";

public String getPassword() {
return password;
}

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

public String getUsername() {
return username;
}

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

public void reset(ActionMapping arg0, HttpServletRequest arg1) {

}
}
Action如下：
public class LoginAction extends Action {

public ActionForward execute(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
LoginForm loginForm = (LoginForm)arg1 ;
User user = new User(loginForm.getUsername(),loginForm.getPassword());
if(user.isExist()){
HttpSession session = arg2.getSession() ;
session.setAttribute("user", user) ;
return arg0.findForward("sucess");
}
return null ;
}
}
validation.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE form-validation PUBLIC "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.0//EN" "http://jakarta.apache.org/commons/dtds/validator_1_0.dtd">

<form-validation >
<formset>
     <form name="loginForm">
        <field property="username" depends="required">
           <arg0 key="username.info"/>
        </field>
     </form>
</formset>
</form-validation>

Application.properties的内容如下：
errors.required={0} is required.
errors.minlength={0} can not be less than {1} characters.
errors.maxlength={0} can not be greater than {1} characters.
errors.invalid={0} is invalid.

errors.byte={0} must be a byte.
errors.short={0} must be a short.
errors.integer={0} must be an integer.
errors.long={0} must be a long.
errors.float={0} must be a float.
errors.double={0} must be a double.

errors.date={0} is not a date.
errors.range={0} is not in the range {1} through {2}.
errors.creditcard={0} is an invalid credit card number.
errors.email={0} is an invalid e-mail address.

username.info= aaaaaaa.

Struts