private void init() {
        try {
            Driver driver = (Driver) Class.forName(driverName).newInstance();
            DriverManager.registerDriver(driver);
        } catch (SQLException | ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
            if (ex.getClass().equals(SQLException.class)) {
                LOGGER.warn(SQL_EXCEPTION + ex.getMessage());
            } else if (ex.getClass().equals(ClassNotFoundException.class)) {
                LOGGER.warn(CLASS_NOT_FOUND_EXCEPTION + ex.getMessage());
            } else if (ex.getClass().equals(InstantiationException.class)) {
                LOGGER.warn(INSTANTIATION_EXCEPTION + ex.getMessage());
            } else {
                LOGGER.warn(ILLEGAL_ACCESS_EXCEPTION + ex.getMessage());
            }
        }
    }