According to TLD or attribute directive in tag file, attribute value does not accept any expressions
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在运用标准标签库和EL表达式写JSP页面的时候，有时候会报500错误
执行某jsp页面时，弹出如标题所示异常，jsp代码如下：
<%@ page language="java" contentType="text/html;charset=gbk" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
</head>
<body>
This is the result:
<c:out value="${userInfo}" default="没有结果"/>
</body>
</html>
异常的原因是不能识别“${userInfo}”,解决办法有两种：
一、在page指令里，加入isELIgnored="true"属性，即
<%@ page language="java" contentType="text/html;charset=gbk" isELIgnored="true" %>
二、把<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>变为：
<%@ taglib prefix="c" uri=http://java.sun.com/jstl/core_rt %>
经过改动之后，jsp页面能正常执行了。
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