为啥我的web.xml当中设置了<load-on-startup>2</load-on-startup>,不能够使用

web.xml当中的代码如下<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
           version="2.5">
     <servlet>
         <servlet-name>GetStocksInfor</servlet-name>
         <servlet-class>GetStocksInfor</servlet-class>
         <load-on-startup>2</load-on-startup>
     </servlet>     <servlet-mapping>
         <servlet-name>GetStocksInfor</servlet-name>
         <url-pattern>/GetStocksInfor</url-pattern>
     </servlet-mapping>
</web-app>
servlet的代码
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.HashMap;/**
 * Created by IntelliJ IDEA.
 * User: lenovo
 * Date: 2012-5-18
 * Time: 11:17:34
 * To change this template use File | Settings | File Templates.
 *返回股票当前信息的servlet
 */
public class GetStocksInfor extends HttpServlet {    //保存股票对象的map
    private HashMap<String,Stock> stocks;
    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        //返回两只股票的价格信息    }    
    protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        this.doGet(httpServletRequest, httpServletResponse);    //To change body of overridden methods use File | Settings | File Templates.
    }    public void init() throws ServletException {
          stocks=new HashMap<String,Stock>();
          //创建股票
          Stock szzs=new Stock(3000.0,2980.2,"上证指数","300001");
          Stock pfyh=new Stock(23.22,23.50,"浦发银行","000021");
          //将股票保存到我们的map当中
          stocks.put(szzs.getId(),szzs);
          stocks.put(pfyh.getId(),pfyh);
          System.out.println(stocks);    }
}
但是当我在运行Tomact的时候，不能够输出呢