找下面的错误中，，

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.io.FileNotFoundException: null/null (系统找不到指定的路径。)
	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:515)
	org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)

root cause

java.io.FileNotFoundException: null/null (系统找不到指定的路径。)
	java.io.FileOutputStream.open(Native Method)
	java.io.FileOutputStream.<init>(Unknown Source)
	java.io.FileOutputStream.<init>(Unknown Source)
	com.trustel.bms.web.action.ServicePolicyAction.execute(ServicePolicyAction.java:203)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)

………………………………………………………………………………………………

最后折磨了许久，在Struts.xml中加上下面的fileUpload拦截器，重新部署，重启Tomcat，搞定了。万岁！  <action name="uploadfile"
   class="com.trustel.bms.web.action.ServicePolicyAction"><!-- 上传文件   method="doUploadFile"-->
   <interceptor-ref name="fileUpload">
    <!-- 配置允许上传的文件类型，多个用","分隔 -->
    <param name="allowedTypes">
     application/msword,text/plain,text/richtext
    </param>
    <!-- 配置允许上传的文件大小，单位字节 -->
    <param name="maximumSize">102400</param>
   </interceptor-ref>
   <interceptor-ref name="defaultStack" />
   <param name="savePath">/servicepolicyUploadFile</param>
   <result>/jsp/servicepolicy/succ.jsp</result>
  </action>