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

public static Connection getConnection() throws Exception {
    try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql://sql9.freemysqlhosting.net:3306/sql9183415",
                "user", "pass");
        System.out.println("Connected");
        return conn;
    } catch (Exception e) {
        System.out.println(e);
    }
    return null;
}