菜鸟struts问题，关于errors输出

hello.no.username.error
少个引号.

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不好意思，是我发帖排版的时候误删掉的
不是这个原因，是的话，eclipse就会发现了是不是我什么地方配置错误了？
在struts-config里需要做什么配置吗？
我的应用是最简单的helloworld？
还是类库版本的问题？我真的是没有方向了，大家帮忙啊，谢谢楼上的！
web.xml配置了吗？
其实你简直就是没有很好利用到struts1.1以上版本的好处啊：），你的这种写法还以1.0的写法
web.xml没有配置，就是默认自动生成的那个，代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
   <servlet>
      <servlet-name>action</servlet-name>
      <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
      <init-param>
         <param-name>config</param-name>
         <param-value>/WEB-INF/struts-config.xml</param-value>
      </init-param>
      <init-param>
         <param-name>debug</param-name>
         <param-value>3</param-value>
      </init-param>
      <init-param>
         <param-name>detail</param-name>
         <param-value>3</param-value>
      </init-param>
      <load-on-startup>0</load-on-startup>
   </servlet>
   <servlet-mapping>
      <servlet-name>action</servlet-name>
      <url-pattern>*.do</url-pattern>
   </servlet-mapping>
</web-app>
还有请教楼上的，在struts1.1以上应该要怎么写，谢谢！
对了，web.xml中<taglib>是不是在struts应用中一定需要定义的？
我把web.xml也配置了
现在错误换了
输入为空时，错误如下：
exception org.apache.jasper.JasperException: org.apache.struts.action.ActionMessage
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.ClassCastException: org.apache.struts.action.ActionMessage
org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
org.apache.jsp.hello_jsp._jspx_meth_html_errors_0(hello_jsp.java:226)
org.apache.jsp.hello_jsp._jspx_meth_html_html_0(hello_jsp.java:140)
org.apache.jsp.hello_jsp._jspService(hello_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
输入badguy时错误如下：
exception javax.servlet.ServletException: org.apache.struts.action.ActionMessages
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.ClassCastException: org.apache.struts.action.ActionMessages
hello.HelloAction.execute(HelloAction.java:62)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)附带hello.jsp代码：
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %><html:html locale="true">
  <head>
    <title><bean:message key="hello.jsp.title"/></title>
    <html:base/>
  </head>
  <body bgcolor="white"><p>    <h2><bean:message key="hello.jsp.page.heading"/></h2><p>   <html:errors/><p>     <logic:present name="personbean" scope="request">
       <h2>
         <bean:message key="hello.jsp.page.hello"/>
         <bean:write name="personbean" property="userName" />!<p>
       </h2>
    </logic:present>    <html:form action="/hello.do" focus="userName" >      <bean:message key="hello.jsp.prompt.person"/>
      <html:text property="userName" size="16" maxlength="16"/><br>      <html:submit property="submit" value="Submit"/>
      <html:reset/>    </html:form><br>    <html:img page="/struts-power.gif" alt="Powered by Struts"/>  </body>
</html:html>
我还把Action里的saveMessages(request, errors)换成了saveErrors(request, (ActionErrors)errors)，请问这两者有什么不同？谢谢大家帮忙了。
我建议，你还是静下心来，myeclipse不是可以设置断点调试么？
你看看到底是哪一个地方出错了，然后再找解决办法
在struts-config.xml最后加入  <message-resources parameter="com.dacop.ApplicationResources" key="org.apache.struts.action.MESSAGE" />
其中ApplicationResources为你定义错误信息的资源文件名称