<%@ page language= "java " contentType= "text/html;charset=GB2312 "%>
<%@ page import= "java.sql.* "%>
<%@ page import= "com.firm.Firm "%>
<html>
<head>
<title> Insert title here </title>
</head>
<body>
<jsp:useBean id= "addBean " scope= "page " class= "com.firm.Firm "/>
<%
String name = new String(request.getParameter( "name ").getBytes( "8859_1 "));
String emote = new String(request.getParameter( "emote ").getBytes( "8859_1 "));
String content = new String(request.getParameter( "content ").getBytes( "8859_1 "));
String strsql = "insert into guestbook (name,emote,content) values ( ' " + name + " ', ' " + emote + " ', ' " + content + " ') ";
addBean.executeUpdate(strsql);
out.print( "您的留言已经保存到数据库中，谢谢！ ");
%>
</body>
</html>
老是提示说org.apache.jasper.JasperException: /ok_guest.jsp(18,0) The value for the useBean class attribute com.firm.Firm is invalid.
而且Firm.class也是放在 WEB-INF\classes\com\firm 下的
------解决方案--------------------
你引这个类包时能不能改成com.firm.*?
改完了以后试试