崩溃了，jsp部署到tomcat 出现页面空白,该怎么解决

崩溃了，jsp部署到tomcat出现页面空白eclipse+jsp+tomcat5.0.25程序在本机上运行正常，没有问题。今天我部署

崩溃了，jsp部署到tomcat 出现页面空白
eclipse + jsp + tomcat5.0.25 程序在本机上运行正常，没有问题。今天我部署到服务器就出问题了。服务器是win2003 ，我用的是tomcat5.0.25 的zip版本。我把本机的整个tomcat拷到服务器上，在浏览器里访问主页，输入用户名登陆成功后应该跳到我定义的页面home.jsp，但出现空白，我把信息输出到控制台，没有异常，显示的sql语句和结果都正确，浏览器的跳转地址也正确，但是home.jsp就是一片空白。我的程序的文件夹结构是这样的：

webapps/ContractorSystem ---- login.jsp
|----- jspPages ---- home ---- home.jsp

后来我把home.jsp换成一个html页面也不行，但把home.jsp直接放在ContractorSystem 下，即和login.jsp页面同级就可以显示。
tomcat配置应该没问题，因为我把部署前备份的程序拷回来就不出这个问题，一切正常。但新程序在我本机上也是正常。

home.jsp页面我是写在web.xml里的
web.xml 片断:

<?xml version= "1.0 " encoding= "UTF-8 "?>
<web-app version= "2.4 "
xmlns= "http://java.sun.com/xml/ns/j2ee "
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance "
xsi:schemaLocation= "http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd ">


<context-param>
<param-name> logger </param-name>
<param-value>
CONSOLE_LOGGER
</param-value>
</context-param>


<context-param>
<param-name> contextPathPre </param-name>
<param-value> /ContractorSystem </param-value>
</context-param>

<context-param>
<param-name> loginPage </param-name>
<param-value> /ContractorSystem/login.jsp </param-value>
</context-param>


<context-param>
<param-name> mainPage </param-name>

<param-value> /ContractorSystem/jspPages/home/home.jsp </param-value>
</context-param>

程序片断：

package org.moto.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.moto.VO.User;
import org.moto.bean.UserBean;
import org.moto.config.APPLICATION;
import org.moto.exception.DataAccessException;
import org.moto.log.ILogger;
import org.moto.util.GlobalMethod;
import org.moto.util.beanUtil.DataAccessBeanWrapper;

import HR_portal.*;

public class UserManagerServlet extends HttpServlet{

private ServletConfig config;
private ILogger logger;

public void init(ServletConfig config) throws ServletException {
this.config = config;
logger=(ILogger)config.getServletContext().getAttribute( "logger ");
logger.log( "Init UserManagerServlet Successfully! ");
}

public void destroy(){
logger.log( "Remove UserManagerServlet Successfully! ");
}

public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
doPost(req,resp);
}

public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
/**
* Test Pool
*/
/*
int count=100;
for(int i=0;i <count;i++){
System.out.print(i+ ". ");
DataAccessBeanWrapper dabw=new DataAccessBeanWrapper();
String sql= "select * from test1 ";
try {
dabw.executeQuery(sql);
} catch (DataAccessException e) {
}
finally{
dabw.close();
}
}*/

String type=req.getParameter( "type ");
if(type.equals( "login ")){
String userName=req.getParameter( "username ");
String password=req.getParameter( "password ");

UserBean ub=new UserBean();
User curUser=ub.validateLogin(userName);
if(null!=curUser){
HttpSession session=req.getSession();
session.setAttribute( "User ", curUser);

//one IT password
/**
LDAP_Login m_login = new LDAP_Login();
m_login.setUserId(userName);
m_login.setPassword(password);
boolean bAuth = m_login.authenticate();
String sUserName = m_login.m_sFullName;
*/
boolean bAuth = true;

if(bAuth==true){
ServletContext context=config.getServletContext();
String mainPage=context.getInitParameter( "mainPage ");
resp.sendRedirect(mainPage);
}
else{
ServletContext context=config.getServletContext();
String loginPage=context.getInitParameter( "loginPage ");
loginPage+= "?error1=System access denied. " +
"Please be sure you have input a valid OneIT login and password.! ";
resp.sendRedirect(loginPage);
}
}
else{
ServletContext context=config.getServletContext();
String loginPage=context.getInitParameter( "loginPage ");
loginPage+= "?error1=System access denied.The User doesn 't exist! ";
resp.sendRedirect(loginPage);
}
}

可能会在哪里出错呢？都快崩溃了，呜呜

[解决办法]

是不是要配置这个啊，注册Servlet,并指定其映射的URL

<servlet>
<servlet-name> UserManagerServlet </servlet-name>
<servlet-class> org.moto.servlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> UserManagerServlet </servlet-name>
<url-pattern> /servlet/UserManagerServlet </url-pattern>
</servlet-mapping>