Servlet.service() for servlet jsp threw exception,NullPointerException

woshichu66 2012-09-20 10:04:29

部分异常如下：

2012-9-20 9:57:40 org.apache.catalina.core.ApplicationDispatcher invoke

严重: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException

	at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:49)

	at org.apache.jsp.jsp.head_jsp._jspx_meth_s_005fselect_005f0(head_jsp.java:181)

	at org.apache.jsp.jsp.head_jsp._jspService(head_jsp.java:137)

	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

我在页面引入了struts2的标签库，然后在页面使用strus2标签，但是每次都提示空指针异常（任何struts2标签都报异常），但是在其他页面使用ok没有这个问题，不知道错在哪里，请高人解答。
页面代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib uri="/struts-tags" prefix="s"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'add.jsp' starting page</title>

    

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">    

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

  </head>

  

  <body>

  <table width="100%">

  	<tr>

  		<td>

  			<div id="pageWrap">

				<div id="pageBody">

					<s:select list="#{1:'男',0:'女',2:'renyao'}"></s:select>

				</div>

			</div>

  		</td>

  	</tr>

  </table>

  </body>

</html>