code: public static Fault createFromJson(String json) {
  		Fault fault = new Fault(null, 0);
  		try (JsonReader reader = Json.createReader(new StringReader(json))) {
  			JsonObject root = reader.readObject();
  			fault.message = root.getString(Constants.Message.Fault.MESSAGE);
  			fault.classname = root.getString(Constants.Message.Fault.CLASSNAME);
  		}
  		return fault;
  	}
docs: Fault json format : {"message":"","classname":"","stacktrace":["","",""]}
  
  @param json
  @return