class.forName报错，请指教

<%
        final String DBDRIVER = "com.mysql.jdbc.Driver" ;
        final String DBURL = "jdbc：mysql://localhost/training" ;
        final String DBUSER = "root" ;
        final String DBPASSWORD = "root" ;
        Connection conn = null ;
        System.out.println("DB link");
    %>
    <%
        try
        {
            Class.forName(DBDRIVER); ;
            conn = DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD) ;
            String sql = "SELECT id,uid,name,password FROM person" ;
            PreparedStatement pstmt = null ;
            pstmt =conn.prepareStatement(sql);
            ResultSet rs = pstmt.executeQuery() ;
            System.out.println("DB query");
    %>

用的室MyEclipse，MySql驱动已添加
程序一执行到Class.forName(DBDRIVER); 就跳出，怎么回事啊