docs: protected void unregisterDriver(){
  		String jdbcURL = this.config.getJdbcUrl();
  		if ((jdbcURL != null) && this.config.isDeregisterDriverOnClose()){
  			logger.info("Unregistering JDBC driver for : "+jdbcURL);
  			try {
  				DriverManager.deregisterDriver(DriverManager.getDriver(jdbcURL));
  			} catch (SQLException e) {
  				logger.info("Unregistering driver failed.", e);
  			}
  		}
  	}