ActionError没法解析为类型

ActionError无法解析为类型
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errors.add( "username ",new ActionError( "error.name.required ");

在PROPERTIES文件也加了error.name.required＝“”
而且也import org.apache.struts.action.ActionErrors;

结果报错说ActionError无法解析为类型。

弄了好半天，哪位给指点下?



------解决方法--------------------
是类库没找到啦
加入
import org.apache.struts.action.ActionMessage;
就可以了
示例
package com.joinbc.struts.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class LoginForm extends ActionForm {
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
// TODO Auto-generated method stub
ActionErrors errors=new ActionErrors();
if(username.equals( " ")||username.equals( "guest "))
{
errors.add( "username ",new ActionMessage( "mytest.error "));
}
return errors;
}

......................
------解决方法--------------------
import org.apache.struts.action.ActionError is needed.