struts2zhong redirect重定向怎么弄都不行啊，求高手解答。。。?报错

在webroot根目录下建一个login.jsp文件，在struts.xml文件中配置如下，使其redirect重定向到/user/hello.jsp页面，在webroot根目录下已创建一个文件夹，文件夹中已有hello.jsp。运行报错如下。

<package name="test" extends="struts-default">
  <action name="login" class="com.jay.UserAction">
   <result type="redirect">/user/hello.jsp</result>
  </action>
 </package>

<s:form action="login">
  <s:textfield name="userName" key="username"></s:textfield>
  <s:password name="password" key="password"></s:password>
  <s:submit key="login"></s:submit>
 </s:form>

严重: Servlet.service() for servlet [jsp] in context with path [/test2] threw exception [java.lang.IllegalArgumentException: can't parse argument number: userName] with root cause
java.lang.NumberFormatException: For input string: "userName"
 at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
 at java.lang.Integer.parseInt(Integer.java:492)
 at java.lang.Integer.parseInt(Integer.java:527)
 at java.text.MessageFormat.makeFormat(MessageFormat.java:1418)
 at java.text.MessageFormat.applyPattern(MessageFormat.java:479)
 at java.text.MessageFormat.<init>(MessageFormat.java:363)
 at com.opensymphony.xwork2.util.LocalizedTextUtil.buildMessageFormat(LocalizedTextUtil.java:704)
 at com.opensymphony.xwork2.util.LocalizedTextUtil.findDefaultText(LocalizedTextUtil.java:229)
 at com.opensymphony.xwork2.DefaultTextProvider.getText(DefaultTextProvider.java:67)
 at com.opensymphony.xwork2.DefaultTextProvider.getText(DefaultTextProvider.java:82)
 at com.opensymphony.xwork2.DefaultTextProvider.getText(DefaultTextProvider.java:129)
 at org.apache.struts2.util.TextProviderHelper.getText(TextProviderHelper.java:75)
 at org.apache.struts2.components.Text.end(Text.java:160)
 at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
 at org.apache.jsp.user.hello_jsp._jspx_meth_s_005ftext_005f1(hello_jsp.java:165)
 at org.apache.jsp.user.hello_jsp._jspService(hello_jsp.java:96)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
 at java.lang.Thread.run(Thread.java:744)