Servlet.service() for servlet jsp threw exception,该如何解决

2013-11-25

Servlet.service() for servlet jsp threw exceptionorg.apache.catalina.core.StandardWrapperValve invo

Servlet.service() for servlet jsp threw exception
org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.left_jsp._jspService(left_jsp.java:105)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

#left.jsp 代码#
<%@ page language="java" pageEncoding="gbk"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %>

<%@page import="org.sx.dto.TUser"%>
<%@page import="org.sx.dto.TRole"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
var m = "";
function menu(num){
sub = eval("sub_"+num+".style");
if(m != sub){
if(m != ""){
m.display = "none";
}
sub.display='block';
m = sub;
}else{
sub.display = "none";
m = "";
}
}
</script>
<link rel="stylesheet" type="text/css" href="images/styles.css">
    <style type="text/css">

        </style>


<%
         TUser user=(TUser)session.getAttribute("user");//youcuo
         TRole role=(TRole)session.getAttribute("role");
         int[] a = (int[])session.getAttribute("a");
if(user==null){
    response.sendRedirect("login.jsp");
}
          System.out.println("接收user的值 "+user.getUserName());
          System.out.println("接收user的值 "+user.getUserRoleId());
%>










</head>
  <body leftmargin=0   topmargin=0 bottommargin="0">
    <table border="0" width="173" height="100%" align="center" cellSpacing="0" cellPadding="0" bgcolor="#E0FBC4">
    

    <tr>
<td onClick="menu(0)" height="33" background="images/m1.jpg">
<font class="m1">
系统管理
</font>
</td>
</tr>

<tr bgcolor="#E0FBC4">
<td id="sub_0" style="display: none;">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==1){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="adminList.do?method=queryAdminList" target="right"   class="sub1">用户管理</a>

</td>
</tr>
<%
}else if(a[i]==2){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="proprietor.do?method=queryProprietor" target="right" class="sub1">
业主管理
</a>
</td>
</tr>
<%
}else if(a[i]==3){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="member.do?method=queryMember" target="right" class="sub1">成员管理</a>
</td>
</tr>
<%
}else if(a[i]==4){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="staff.do?method=querystaff" target="right" class="sub1">员工管理</a>
</td>
</tr>
<%
}else if(a[i]==5){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="role.do?method=queryRole" target="right" class="sub1">权限管理</a>
</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>
    
    <tr>
<td onClick="menu(1)" height="33" background="images/m1.jpg">
<font class="m1">
楼房管理
</font>
</td>
</tr>
<tr bgcolor="#E0FBC4">
<td id="sub_1" style="display: none">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==6){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="floor.do?method=queryFloor" target="right" class="sub1">楼栋信息</a>
</td>
</tr>
<%
}else if(a[i]==7){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="room.do?method=queryRoom" target="right" class="sub1">房间信息</a>
</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>

    <tr>
<td onClick="menu(2)" height="33" background="images/m1.jpg">
<font class="m1">
资费管理
</font>
</td>
</tr>
<tr bgcolor="#E0FBC4">
<td id="sub_2" style="display: none">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==8){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="charge.do?method=queryCharge" target="right" class="sub1">资费详情</a>
</td>
</tr>
<%
}else if(a[i]==9){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="pay.do?method=queryPay" target="right" class="sub1">缴费详情</a>
</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>

    <tr>
<td onClick="menu(3)" height="33" background="images/m1.jpg">
<font class="m1">
物资管理
</font>
</td>
</tr>
<tr bgcolor="#E0FBC4">
<td id="sub_3" style="display: none">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==10){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="material/index.jsp" target="right" class="sub1">物资详情</a>
</td>
</tr>
<%
}else if(a[i]==11){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="material/use/index.jsp" target="right" class="sub1">物资使用</a>

</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>

    <tr>
<td onClick="menu(4)" height="33" background="images/m1.jpg">
<font class="m1">
维修记录
</font>
</td>
</tr>
<tr bgcolor="#E0FBC4">
<td id="sub_4" style="display: none">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==12){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="ttorepair.do?method=queryTTorepair" target="right" class="sub1">用户报修</a>
</td>
</tr>
<%
}else if(a[i]==13){
%>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="trepair.do?method=queryTRepair" target="right" class="sub1">维修反馈</a>
</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>

    <tr>
<td onClick="menu(5)" height="33" background="images/m1.jpg">
<font class="m1">
车位管理
</font>
</td>
</tr>
<tr bgcolor="#E0FBC4">
<td id="sub_5" style="display: none">
<table width="80%" align="center">
<%
    for(int i=0; i<a.length; i++){
    if(a[i]==14){
     %>
<tr>
<td height="22" onmouseover="this.style.backgroundColor='#ffffff'" onmouseout="this.style.backgroundColor=''">
<a href="parking/index.jsp" target="right" class="sub1">车位详情</a>
</td>
</tr>
<%
}}
%>
</table>
</td>
</tr>
<tr>
<td height="100%"></td>
</tr>
</table>
  </body>
</html>
java
[解决办法]

java.lang.NullPointerException
at org.apache.jsp.left_jsp._jspService(left_jsp.java:105)

你看看这行，，只获取到了没，感觉好乱。。
[解决办法]
session.setAttribute("user", user);
session.setAttribute("role", role);
session.setAttribute("a", a);
你在这行代码后面打印一下这几个对象user，role，和a，看有没有空值

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Servlet.service() for servlet jsp threw exception,该如何解决