public static Data getDataFromJson(String json){
		ObjectMapper mapper = new ObjectMapper();
		Data data = null ;
		
		try {
			data = mapper.readValue(json, Data.class) ;
		} catch (JsonGenerationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JsonMappingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return data ; // return null si �a �choue
	}