拦截器配置报错

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struts.xml配置如下

  <package name="news" extends="json-default" namespace="/news">
    <interceptors>
        <interceptor name="adminLogin" class="com.zzy.interceptor.AdminInterceptor"></interceptor>
        <interceptor-stack name="loginStack">
            <interceptor-ref name="defaultStack"/>
            <interceptor-ref name="adminLogin"/>            
        </interceptor-stack>
    </interceptors>
    <action name="*" class="com.zzy.action.NewsAction" method="{1}">
        <result name="go_addN">/WEB-INF/NewsPage/addNews.jsp</result>
        <result name="go_listN">/WEB-INF/NewsPage/listNews.jsp</result>
        <result name="addnews" type="json">    <!-- 添加 -->
                <param name="root">message</param>
        </result>
        <result name="pageJson" type="json">    <!-- 获取分页 -->
            <param name="root">pageJson</param>
        </result>
        <result name="go_update">/WEB-INF/NewsPage/updateNews.jsp</result>      <!-- 更新跳转 -->
        <result type="json" name="update_success">      <!-- 更新新闻 -->
            <param name="root">message</param>
        </result>
        <result type="json" name="delNews"> <!-- 删除新闻 -->
            <param name="root">status</param>
        </result>
    <!-- 对应方法 -->
    <interceptor-ref name="adminLogin"/>
    <interceptor-ref name="defaultStack"/>
    <allowed-methods>addNews,listNews,goUpdate,updateNews,delNews,go_addN,go_listN</allowed-methods>
    </action>
  </package>  
  
  <package name="category" extends="json-default"  namespace="/category">
    <action name="*" class="com.zzy.action.NewsAction" method="{1}">
        <result name="go_addC">/WEB-INF/CategoryPage/addCategory.jsp</result>
        <result name="go_listC">/WEB-INF/CategoryPage/listCategory.jsp</result>
        <result name="addCategory" type="json"><!-- 添加类型 -->
            <param name="root">message</param>
        </result>
        <result name="listCategory" type="json"><!-- 获取所有 -->
            <param name="root">pageJson</param>
        </result>
        <result name="go_update">/WEB-INF/CategoryPage/updateCategory.jsp</result><!-- 更新跳转 -->
        <result type="json" name="update_success"><!-- 更新操作 -->
            <param name="root">message</param>
        </result>
        <result type="json" name="delCategory"><!-- 删除分类 -->
            <param name="root">status</param>
        </result>
        <interceptor-ref name="adminLogin"/>
    <interceptor-ref name="defaultStack"/>//*******报错提示代码行*******
        <allowed-methods>addCategory,listCategory,goUpdateC,updateCategory,delCategory,go_addC,go_listC</allowed-methods>
    </action>
  </package>

最后发现是因为:

name="defaultStack"的拦截器只在<package name="news"包里面定义，<package name="category"包没有.

解决方法:

将拦截器独立放在一个package里，其他action的package继承这个包