tomcat7.0.5之jsp错误处理 _JavaScript

tomcat7.0.5之jsp异常处理
jsp九大默认对象分别是request,response,out,pageContext,session,application,page,config,exception。
我们这里使用exception对象来处理异常.
实验环境:
tomcat7.0.5
JDK6.0.23
firefox3.6.9
代码如下:
index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" errorPage="error.jsp"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <%
    String str = null;
    str.length();
    %>
</body>
</html>

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isErrorPage="true"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
exception<br/>
<%=exception%>
</body>
</html>