SSH问题，There is no Action mapped for action name null. - [unknown location]
index.jsp页面如下：

   <div align="center" style="border-style: groove">

     <form action="login" id="login" method="post"  onsubmit="return isNull();">

     <strong>姓&nbsp;&nbsp;&nbsp;&nbsp;名：</strong>

     <input type="text" name="user.name" class="tablestyle" id="user.name"  style="width:200px"><br>

    <strong>密&nbsp;&nbsp;&nbsp;&nbsp;码：</strong>

     <input type="password" name="user.password" class="tablestyle" id="user.password"  style="width:200px"><br>

       <input type="submit", name ="login" value="登录" class="onmouseout"

       onmouseover="this.className='onmouseover'"

       onmouseout="this.className='onmouseout'">    

         

      <a href="<%=path %>">找回密码</a>

      <a href="<%=path %>/reg.jsp">注册</a>

     </form>

    </div>

web.xml如下：

 <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  

  <servlet>

   <servlet-name>UpLoadPic</servlet-name>

   <servlet-class>com.poscard.Util.UpLoadPic</servlet-class>

  </servlet>

  <servlet-mapping>

   <servlet-name>UpLoadPic</servlet-name>

   <url-pattern>/UpLoadPic1</url-pattern>

  </servlet-mapping>

  

  <filter>

      <filter-name>struts2</filter-name>

      <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

  </filter>

  <filter-mapping>

  	<filter-name>struts2</filter-name>

  	<url-pattern>/*</url-pattern>

  </filter-mapping>







   

  <!-- spring -->

	<listener>

		<listener-class>

			org.springframework.web.context.ContextLoaderListener

		</listener-class>

	</listener>

	

	<context-param>

		<param-name>contextConfigLocation</param-name>

		<param-value>

			classpath:/beans.xml

		</param-value>

	</context-param>

现在的问题是，当我点击注册超链接时，会跳转到reg.jsp。但是后台报错：

[http-8099-1] WARN  org.apache.struts2.dispatcher.Dispatcher  - Could not find action or result

There is no Action mapped for action name null. - [unknown location]

	at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.jav