tomcat 500 错误 烦请高手指点
我tomcat已经运行，mysql什么都加载好了但是运行war文件后，就出现500错误，如下，
请高手指点！
谢谢
HTTP Status 500 -
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type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 4
1: <%@ page language="java" contentType="text ml; charset=UTF-8"
2: pageEncoding="UTF-8"%>
3: <%
4: ArrayList<Auto> autos = AutoDAO.getAutos();
5: ArrayList<Series> seriesArray = SeriesDAO.getSeries();
6: %>
7: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" " http://www.w3.org/TR/html4/loose.dtd">
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.carshop.util.EncodingFilter.doFilter(EncodingFilter.java:37)
com.carshop.web.LoginFilter.doFilter(LoginFilter.java:53)
root cause
java.lang.NullPointerException
com.carshop.dao.AutoDAO.getAutos(AutoDAO.java:47)
org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.carshop.util.EncodingFilter.doFilter(EncodingFilter.java:37)
com.carshop.web.LoginFilter.doFilter(LoginFilter.java:53)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
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tomcat 烦请
----------------解决方案--------------------------------------------------------
500错误是 运行服务器代码 有错，NullPointerException报空指针，你调试下ArrayList<Auto> autos = AutoDAO.getAutos();的getAutos();方法试下，应该是这个方法返回的数据为null，所以在页面显示时从Null中取东西才报错吧！！！！！
----------------解决方案--------------------------------------------------------