前端采用log4j打印异常信息

<%@ include file="/common/taglibs.jsp" %>
<%@ page import="org.apache.log4j.Logger" %> 
<%@ page language="java" errorPage="/error.jsp" pageEncoding="UTF-8" contentType="text/html;charset=utf-8" %>

<title>Data Access Error</title>

<head>
    <meta name="heading" content="System Exception"/>
    <meta name="menu" content="AdminMenu"/>
</head>

<p>
    <c:out value="${requestScope.exception.message}"/>
</p>

<% 
Throwable ex = (Exception) request.getAttribute("exception"); 
Logger logger = Logger.getLogger("systemError.jsp"); 
logger.error(ex.getMessage(),ex); 
//((Exception) request.getAttribute("exception")).printStackTrace(new java.io.PrintWriter(out));
%>
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