List<NewsForm> newsList;

    //存放action之间的提示信息
    String actionMsg ;


           public String listNews(){
        if (actionMsg!=null)addActionMessage(java.net.URLDecoder.decode(actionMsg));
        newsList = service.allNews();
        return SUCCESS;
    }

<s:if test="newsList!=null">
                        <table border="1">
                            <tr align="center">
                                <td>
                                    xxx                                    <s:hidden name="news_detail"/>
                                </td>
                                <td>
                                    xxxxx                                </td>
                                <td>
                                    xxxxxx                                </td>
                                <td>
                                xxxxxxxxxxxx                                </td>
                                <td align="center" colspan=4>
                                    操作
                                </td>
                            </tr>
                        <s:iterator id="row" value="newsList">
                    <tr align="center" >
                        <td ><s:property value="news_id"/></td>
                        <td ><s:property value="news_theme"/></td>
                        <td ><s:property value="news_author"/></td>
                        <td ><s:property value="news_date"/></td>

<action name="news_*" class="com.xwxt.action.AllNewsAction" method="{1}">
            <!-- 定义名为success的局部result，其结果类型为redirect-action -->
            <result name="searchAll" type="redirectAction">
                <param name="actionName">news_listNews</param>
                <param name="actionMsg">${actionMsg}</param>
            </result>
            <!-- 定义名为success的局部result，其结果类型为默认的dispatcher -->
            <result>/index.jsp</result>            

<result name="searchAll" type="redirectAction">

------解决方案--------------------
<s:if test="newsList!=null">

这样写试试：<s:if test="#request.newsList!=null">

------解决方案--------------------
再写一句

HTML code
<s:if test="newsList != null">
asdfdasf
</s:if>

------解决方案--------------------