java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

String url = "jdbc:mysql://localhost:3306/eventhub_test"; //
    String user = "root";
    String pass = "";

 SQLUtils sqlu = new SQLUtils(url, user, pass);

public class SQLUtils {


private String CONNECTION_URL;
private String user;
private String pass;
private java.sql.Statement stmt;
private java.sql.Connection conn;

public SQLUtils(String conn_url, String user, String pass) {
    this.CONNECTION_URL = conn_url;
    this.user = user;
    this.pass = pass;
}


public void init() throws IllegalAccessException, InstantiationException, ClassNotFoundException, SQLException {

    Class.forName ("com.mysql.jdbc.Driver").newInstance ();
    conn = DriverManager.getConnection(CONNECTION_URL, user, pass);
    stmt = conn.createStatement();

}
}

mysql-connector-java-5.1.7-bin.jar

String url = "jdbc:mysql://10.0.2.2/test";

public void init() throws IllegalAccessException, InstantiationException,
        ClassNotFoundException, SQLException {

    Class.forName("com.mysql.jdbc.Driver").newInstance();
    try {
        conn = DriverManager.getConnection(CONNECTION_URL, user, pass);
    } catch (java.sql.SQLException e1) {
        e1.printStackTrace();
    }
    try {

        stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT title FROM books");
        String entry;
        while (rs.next()){
            entry = rs.getString(1);
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (java.sql.SQLException e) {
        e.printStackTrace();
    }

}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public void conectarBDMySQL (String user, String password,
            String ip, String port, String cat)
    {
        if (conexionMySQL == null)
        {
            String urlConexionMySQL = "";
            if (cat!= "")
                urlConexionMySQL = "jdbc:mysql://" + ip + ":" + port+ "/" + cat;
            else
                urlConexionMySQL = "jdbc:mysql://" + ip + ":" + port;
            if (user!= "" & password!= "" & ip != "" & port!= "")
            {
                try
                {
                    Class.forName("com.mysql.jdbc.Driver");
                    conexionMySQL = DriverManager.getConnection(urlConexionMySQL,
                            user, password);
                }
                catch (ClassNotFoundException e)
                {
                      Toast.makeText(getApplicationContext(),
                                "Error: " + e.getMessage(),
                                Toast.LENGTH_SHORT).show();
                }
                catch (SQLException e)
                {
                      Toast.makeText(getApplicationContext(),
                                "Error: " + e.getMessage(),
                                Toast.LENGTH_SHORT).show();
                }
            }
        }
    }