javax.servlet.ServletException: org.apache.struts.chain.commands.InvalidPathExce

org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
com.mycompany.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:79)
root cause struts-config
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd"><struts-config>
  <form-beans>
   <form-bean name="userForm" type="com.mycompany.struts.actionForm.UserForm"/>
  </form-beans>
  <global-exceptions />
  <global-forwards />
  <action-mappings >
    <action path="/user" name="userForm" parameter="method" scope="request" input="/index.jsp" type="org.springframework.web.struts.DelegatingActionProxy">
    <forward name="menu" path="/frame.jsp"/>
    <forward name="index" path="/index.jsp"/>
    <forward name="regedit" path="/regedit.jsp"/>
    <forward name="userManage" path="/adm/userManage.jsp"/><!--  -->
    </action>
  </action-mappings>
  <message-resources parameter="com.mycompany.struts.ApplicationResources" />
  <plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">
       <set-property property="contextConfigLocation" value="/WEB-INF/applicationContext.xml" />
  </plug-in>
</struts-config>
*.jsp文件
<a href="newsType.do?method=toNewsTypeManage" target="main">首页</a>