Loading class 'com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is

public void cargarClaves(){
    cbxNumCte.removeAllItems();
    Connection conn = null;
    Statement stm = null;
    ResultSet rs = null;
    try{
        Class.forName("com.mysql.cj.jdbc.Driver");
    }
    catch(ClassNotFoundException ex){
        ex.printStackTrace();
        System.exit(-1);
    }
    try{
        conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1/aimx?autoReconnect=true&useSSL=false","admin","admin");
        stm = conn.createStatement();
        rs = stm.executeQuery("SELECT NumCte FROM clientes");
        while(rs.next()) {
            cbxNumCte.addItem(rs.getString(1));
        }
    }
    catch(SQLException exc){
        JOptionPane.showMessageDialog(null, "Hubo problemas accediendo a la base de datos", "Borrar Clientes", JOptionPane.ERROR_MESSAGE);
        exc.printStackTrace();
        //System.exit(-1);
    }
}