急！！！SSH开发，报出错误，大家帮忙看看吧。。

启动TOMCAT5.5后，在浏览器里点击链接之后，页面显示的结果如下：

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:460)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:355)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
[code]javax.servlet.ServletException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jsp.my_jsp._jspService(my_jsp.java:90)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)
org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:830)
org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
org.hibernate.type.EntityType.resolve(EntityType.java:303)
org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
org.hibernate.loader.Loader.doQuery(Loader.java:717)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
org.hibernate.loader.Loader.doList(Loader.java:2145)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
org.hibernate.loader.Loader.list(Loader.java:2024)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1106)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
net.cool9.houselease.dao.imp.BaseDaoImp.query(BaseDaoImp.java:445)
net.cool9.houselease.dao.imp.TblZfxxDaoImp.query(TblZfxxDaoImp.java:75)
net.cool9.houselease.biz.imp.TblZfxxBizImp.getByUser(TblZfxxBizImp.java:60)
net.cool9.houselease.web.action.TblZfxxAction.getByUser(TblZfxxAction.java:136)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)
org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:110)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jsp.my_jsp._jspService(my_jsp.java:90)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
========================================================================

[code]接下来是要访问的页面，可是没有显示出来，代码如下：

<%@ taglib prefix="bean" uri="/WEB-INF/struts-bean.tld"%>
<%@ taglib prefix="logic" uri="/WEB-INF/struts-logic.tld"%>
<%@ taglib prefix="html" uri="/WEB-INF/struts-html.tld"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="net.cool9.houselease.entity.TblUser"%>
<%@ include file="check.jsp"%>
<%
if (request.getAttribute("zfxxList") == null) {
TblUser user = (TblUser) request.getSession().getAttribute("user");
int aa = user.getUid();
request.getRequestDispatcher("zfxx.do?op=getByUser&uid=" + aa).forward(request, response);
return;
}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>衮雪出租房</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<link href="style/mycss.css" rel="stylesheet" type="text/css" />
<link href="style/texts.css" rel="stylesheet" type="text/css" />
<link href="style/btn.css" rel="stylesheet" type="text/css" />

</HEAD>
<BODY BGCOLOR=#FFFFFF LEFTMARGIN=0 TOPMARGIN=0 MARGINWIDTH=0
MARGINHEIGHT=0>

<table width="780" border="0" align="center" cellpadding="0"
cellspacing="0">
<tr>
<td colspan="5">
<img src="images/top.jpg" width="780" height="213">
</td>
</tr>
<tr>
<td colspan="5">
<img src="images/middle1.jpg" width="780" height="47">
</td>
</tr>
<tr>
<td width="38" background="images/middle2.jpg">
 
</td>
<td width="172" valign="top">

<script language="javascript">
<!--
function login(){
if( document.myForm.uname.value =="" ){
alert("用户名不能为空");
return false;
}else if(document.myForm.upass.value == ""){
alert("密码不能为空");
return false;
} else {
return true;
}
}
-->
</script>

<table align="center">
<tr>
<td width=''>
<font color='red'>当前用户：${user.uname }</font>
</td>
</tr>
<tr>
<td width='150'>
<a href="pass.jsp">修改密码</a>
</td>
</tr>
<tr>
<td width='150'>
<a href="my.jsp">管理我的租房信息</a>
</td>
</tr>
<tr>
<td width='150'>
<a href="list.jsp">查看所有租房信息</a>
</td>
</tr>
<tr>
<td width='100'>
<a href="post.jsp">发布租房信息</a>
</td>
</tr>
<tr>
<td width='100'>
<a href="index.jsp">返回首页</a>
</td>
</tr>
<tr>
<td width='100'>
<a href="logout.jsp">[注销]</a>
</td>
</tr>
</table>
</td>
<td width="35" background="images/layout_24.gif">
 
</td>
<td width="495">
<table>
<tr>
<td width="3%">
 
</td>
<td width="97%">

<table width='450' border='0'>
<tr>
<TD>
标题
</TD>
<TD width='100' align='center'>
月租金
</TD>
<TD width='110' align='center'>
发布日期
</TD>
<TD width='50'>
 
</TD>
<TD width='50'>
 
</TD>
</tr>
<tr>
<td colspan='5'>
<hr />
</td>
</tr>
<logic:notEmpty name="zfxxList">
<logic:iterate id="zfxxEntity" name="zfxxList">
<tr>
<td>
<a href='detail.jsp?id=${zfxxEntity.fwid }'>${zfxxEntity.title
}</a>
</td>
<td align='center' style='height: 30px;'>
${zfxxEntity.zj}元
</td>
<td align='center'>
<bean:write name="zfxxEntity" property="date"
format="yyyy-MM-dd" />
</td>
<td align='center' style='height: 30px;'>
<a href='javascript:;'
onclick="if(confirm('是否删除？'))window.location.href='zfxx.do?op=del&id=${zfxxEntity.fwid }';">[删除]</a>
</td>
<td align='center' style='height: 30px;'>
<a href='edit.jsp?id=${zfxxEntity.fwid }'>[修改]</a>
</td>
</tr>
</logic:iterate>
</logic:notEmpty>
<logic:empty name="zfxxList">
<tr>
<td colspan='5' align='center'>
您还没有发布信息，现在就去
<a href="post.jsp">发布一条</a>！
</td>
</tr>
</logic:empty>
<tr>
<td colspan='5'>
<hr />
</td>
</tr>
</table>

</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
</table>
</td>
<td width="40" background="images/middle4.jpg">
 
</td>
</tr>
<tr>
<td colspan="5">
<img src="images/bottom.jpg" width="780" height="82">
</td>
</tr>
</table>
<P align="center">
2009 Shaanxi HanZHong Shaanxi University of Technology
</P>
<br />
</BODY>
</HTML>

===================================

大家帮帮忙了。。。。。

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