Old mySql driver, or missing something?

Question

Hi,
i am a nub in web applications in java.
I have a system using jrun4 (and tomcat 5 as a second app server), mysql 5, and the java connector driver connector/j 3.1.11 .
The mysql database is running on port 3306.
I am trying to make a connection to the database so i ve writen the following simple jsp program:
<%@ page language="java" import="java.sql.*" %>
<%
     try {
          String sAddress = (String)session.getValue("ADDRESS");
          String sDatabase = (String)session.getValue("DATABASE");
          String sUsername = (String)session.getValue("USERNAME");
          String sPassword = (String)session.getValue("PASSWORD");
          if (sAddress == null || sDatabase == null || sUsername == null || sPassword == null) {
               sAddress = request.getParameter("ADDRESS");
               sDatabase = request.getParameter("DATABASE");
               sUsername = request.getParameter("USERNAME");
               sPassword = request.getParameter("PASSWORD");
          // try a connection
          Class.forName("org.gjt.mm.mysql.Driver").newInstance();
          Connection conn = DriverManager.getConnection("jdbc:mysql://" + sAddress + "/" + sDatabase +"?user=" + sUsername + "&password=" + sPassword);
          conn.createStatement();
          conn.close();
          // put connection data into session
          session.putValue("ADDRESS", sAddress);
          session.putValue("DATABASE", sDatabase);
          session.putValue("USERNAME", sUsername);
          session.putValue("PASSWORD", sPassword);
          // proceed with success
          response.sendRedirect("menu.html");
          return;
     } catch (Exception e) {
          out.print("<font color=red><center>" + e.toString() + "</center></font><br>\n");
%>
When i try to run it will throw a the following exception:
java.sql.SQLException: Cannot connect to MySQL server on null:3306. Is there a MySQL server running on the machine/port you are trying to connect to? (java.net.UnknownHostException)
i think that the main reason this is happening is because its trying to find:
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
while the driver connector/j 3.1.11(which is the latest on www.mysql.com)is providing a class name:
com.mysql.jdbc.Driver
so i looked and found a very old connector driver: mm.mysql.2.0.12
which is providing name class: org.gjt.mm.mysql.Driver.
the problem is still there though...
Am i missing something????
Is there a special way to install that driver???
What step do you think i should follow???
Do you think its something else that might be responsible????

Answer 1

Hi,
i am a nub in web applications in java.
I have a system using jrun4 (and tomcat 5 as a second app server), mysql 5, and the java connector driver connector/j 3.1.11 .
The mysql database is running on port 3306.
I am trying to make a connection to the database so i ve writen the following simple jsp program:
<%@ page language="java" import="java.sql.*" %>
<%
     try {
          String sAddress = (String)session.getValue("ADDRESS");
          String sDatabase = (String)session.getValue("DATABASE");
          String sUsername = (String)session.getValue("USERNAME");
          String sPassword = (String)session.getValue("PASSWORD");
          if (sAddress == null || sDatabase == null || sUsername == null || sPassword == null) {
               sAddress = request.getParameter("ADDRESS");
               sDatabase = request.getParameter("DATABASE");
               sUsername = request.getParameter("USERNAME");
               sPassword = request.getParameter("PASSWORD");
          // try a connection
          Class.forName("org.gjt.mm.mysql.Driver").newInstance();
          Connection conn = DriverManager.getConnection("jdbc:mysql://" + sAddress + "/" + sDatabase +"?user=" + sUsername + "&password=" + sPassword);
          conn.createStatement();
          conn.close();
          // put connection data into session
          session.putValue("ADDRESS", sAddress);
          session.putValue("DATABASE", sDatabase);
          session.putValue("USERNAME", sUsername);
          session.putValue("PASSWORD", sPassword);
          // proceed with success
          response.sendRedirect("menu.html");
          return;
     } catch (Exception e) {
          out.print("<font color=red><center>" + e.toString() + "</center></font><br>\n");
%>
When i try to run it will throw a the following exception:
java.sql.SQLException: Cannot connect to MySQL server on null:3306. Is there a MySQL server running on the machine/port you are trying to connect to? (java.net.UnknownHostException)
i think that the main reason this is happening is because its trying to find:
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
while the driver connector/j 3.1.11(which is the latest on www.mysql.com)is providing a class name:
com.mysql.jdbc.Driver
so i looked and found a very old connector driver: mm.mysql.2.0.12
which is providing name class: org.gjt.mm.mysql.Driver.
the problem is still there though...
Am i missing something????
Is there a special way to install that driver???
What step do you think i should follow???
Do you think its something else that might be responsible????