小小问题：Unsupported encoding:gb2312 谢谢！

一个页面application.jsp
<%@ page language="java" contentType="text/html;charset=gb2312 " %>
<% int     count=0;
   String  counter_name=request.getParameter("counter_name");
   try 
   {
      count=Integer.parseInt((application.getAttribute(counter_name).toString()));
   }
   catch(Exception e)
   {
   }
   out.println(" HAVE VISITED "+count+"times");
   count++;
   application.setAttribute(counter_name,new Integer(count));
%>
另一个时test_application.jsp
<%@ page language="java" contentType="text/html;charset=gb2312" 
         import="java.sql.*" errorPage="" %>
<html>
<head> 
<title> use the calculater </title>
</head>
<body>
test the application page  !@!!
<jsp:include page="application.jsp" >
<jsp:param name="counter_name" value="test_application.jsp" />
</jsp:include>
</body>
</html>
运行test_application 时出现提示：
org.apache.jasper.JasperException: Unsupported encoding: gb2312 
谢谢