gson builder

public static final Gson gson = new GsonBuilder()
            .serializeNulls()
            .registerTypeAdapter(LocalDateTime.class, (JsonSerializer<LocalDateTime>) (localDateTime, typeOfSrc, context) -> {
                if (Objects.isNull(localDateTime)) {
                    return new JsonPrimitive("");
                }
                return new JsonPrimitive(localDateTime.format(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMATTER)));
            })
            .registerTypeAdapter(LocalDateTime.class, (JsonDeserializer<LocalDateTime>) (json1, typeOfT, context) -> {
                String string = json1.getAsJsonPrimitive().getAsString();
                if (Strings.isNullOrEmpty(string)) {
                    return null;
                }
                try {
                    return LocalDateTime.parse(string, DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMATTER));
                }catch (RuntimeException exception){
                    return LocalDateTime.parse(string, DateTimeFormatter.ISO_DATE_TIME);
                }
            })
            .registerTypeAdapter(LocalDate.class, (JsonSerializer<LocalDate>) (localDate, type, jsonSerializationContext) -> {
                if (Objects.isNull(localDate)) {
                    return new JsonPrimitive("");
                }
                return new JsonPrimitive(localDate.format(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMATTER)));
            })
            .registerTypeAdapter(LocalDate.class, (JsonDeserializer<LocalDate>) (json, typeOfT, context) -> {
                String string = json.getAsJsonPrimitive().getAsString();
                if (Strings.isNullOrEmpty(string)) {
                    return null;
                }
                return LocalDate.parse(string, DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMATTER));
            })
            .registerTypeAdapter(LocalTime.class, (JsonSerializer<LocalTime>) (localTime, type, jsonSerializationContext) -> {
                if (Objects.isNull(localTime)) {
                    return new JsonPrimitive("");
                }
                return new JsonPrimitive(localTime.format(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMATTER)));
            })
            .registerTypeAdapter(LocalTime.class, (JsonDeserializer<LocalTime>) (json, typeOfT, context) -> {
                String string = json.getAsJsonPrimitive().getAsString();
                if (Strings.isNullOrEmpty(string)) {
                    return null;
                }
                return LocalTime.parse(string, DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMATTER));
            })
            .registerTypeAdapter(Date.class, (JsonSerializer<Date>) (date, type, jsonSerializationContext) -> {
                if (Objects.isNull(date)) {
                    return new JsonPrimitive("");
                }
                SimpleDateFormat fmt = new SimpleDateFormat(DEFAULT_DATE_TIME_FORMATTER);
                //SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
                //fmt.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
                return new JsonPrimitive(fmt.format(date));
            })
            .create();