请帮帮忙
我刚学jsp请多帮助
我用jbuild建立的jsp文件
<%@page language ="Java"%>
<%@ page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
Hello World
</title>
</head>
<jsp:useBean id="jsp1BeanId" scope="session" class="paintgradient.Jsp1Bean" />
<jsp:setProperty name="jsp1BeanId" property="*" />
<body bgcolor="#ffffff">
<center>
<font size=5 color=blue>多种字体</font>
</center>
<br>
<hr>
<br>
<div align="center">
<%
for(int i=1;i<=6;i++)
out.println("<h"+i+">Hello World!>/h"+i+">");
%>
</div>
</body>
</html>
怎么老提示错误com.borland.primetime.util.AssertionException: gbk
,为什么?