wrong

public static String querySurfaceTemperature() throws Exception{
		PublicDataDao publicDataDao = DaoFactory.getInstance().getPublicDataDao();
		Connection conn = DaoFactory.getInstance().getConnection();
		String surfaceTemperature = "";
		ArrayList<WeatherStation> weatherStationList = null;
		weatherStationList = publicDataDao.queryFixWeatherStation(conn, null);
		surfaceTemperature = weatherStationList.get(0).getNewestWeather().getSurfaceTemperature();
		return surfaceTemperature;
	}