[java] SQL connection with executable jar

import java.sql.*;
import javax.swing.*;
import java.util.*;

public class MySqlConnector
{
    public MySqlConnector(String user,String password, ArrayList theTeams)
    {
        try
        {
            String url="jdbc:mysql://localhost/tournament?" +
                       "user=usr101&password=pass";

            String driver="org.gjt.mm.mysql.Driver";

            // Produces the driver needed for a JDBC connection
            try
            {
                Class.forName(driver);
            }
            catch(Exception e)
            {
                JOptionPane.showMessageDialog(null,
                               "Couldn't find driver: " + e.getMessage());
            }

            // Attempts to make connection with driver
            Connection con = DriverManager.getConnection(url);

            // Checks the user name and password
            String query ="SELECT * FROM users WHERE username = '" + user +
                           "' AND password = '" + password + "' AND admin = '1';";

            Statement stmt = con.createStatement();

            ResultSet RS = stmt.executeQuery(query);

            if(RS.next()) // User ID and password are valid
            {
                // System started
				IDGen iDG = new IDGen();
                int tournamentID = iDG.generateID(con);
                Tournament tourny = new Tournament(theTeams, con, tournamentID);
            }
           else
            {
                // Connections and statements terminated
                stmt.close();
                con.close();

                // Show access denied dialog.
                JOptionPane.showMessageDialog(null,"Invalid userID/password");

                // Restart login process.
                Login loginScreen = new Login(theTeams);
            }

        }
        catch(SQLException e)
        {
            JOptionPane.showMessageDialog(null, "Error:" + e.getMessage());
        }


    }
}

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/mysql/jdbc/Driver

getClass().getResource()