HTTP Status 500 -

type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: org.gjt.mm.mysql.Driver
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.db_jsp._jspService(db_jsp.java:82)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1340)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:148)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:69)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:141)
org.apache.jsp.db_jsp._jspService(db_jsp.java:47)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)这是什么问题啊,我只是写的一个连接mysql 数据库的小程序<%@ page contentType="text/html;charset=gb2312"%> 
<%@ page import="java.sql.*"%> 
<html> 
<body> 
<%Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
String url ="jdbc:mysql://127.0.0.1:3306/new_db?user=root&password=111";
Connection conn= DriverManager.getConnection(url); 
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); 
String sql="select * from dbtable"; 
ResultSet rs=stmt.executeQuery(sql); %>
<table><tr><td>您的第一个字段内容为：</td>
           <td>您的第二个字段内容为：</td></tr>
<%
while(rs.next()) {%> 
<tr><td>
<%=rs.getString(1)%> </td><td>
<%=rs.getString(2)%> </td></tr>
<%}%> 
</table>
<%out.print("数据库操作成功，恭喜你");%> 
<%rs.close(); 
stmt.close(); 
conn.close(); 
%> 
</body>