public class SampleDto implements JsonSerializer<SampleDto>, JsonDeserializer<SampleDto> {
	private static final long serialVersionUID = 8349420239867344581L;

	private String key;
	private LocalDateTime localDateTime = LocalDateTime.now();

	public SampleDto(String key, LocalDateTime localDateTime) {
		this.key = key;
		this.localDateTime = localDateTime;
	}

	@Override
	public JsonElement serialize(SampleDto src, Type typeOfSrc, JsonSerializationContext context) {
		DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
		JsonObject result = new JsonObject();
		result.add("key", new JsonPrimitive(key));
		// LocalDateTime Serialize
		result.add("localDateTime", new JsonPrimitive(formatter.format(localDateTime)));
		return result;
	}

	@Override
	public SampleDto deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
			throws JsonParseException {
		DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
		final JsonObject jsonObject = json.getAsJsonObject();
		String key = jsonObject.get("key").getAsString();
		// LocalDateTime Deserialize
		LocalDateTime localDateTime = formatter.parse(jsonObject.get("localDateTime").getAsString(),
				LocalDateTime::from);

		return new SampleDto(key, localDateTime);
	}

	public LocalDateTime getLocalDateTime() {
		return localDateTime;
	}
}

ublic class SampleDtoTest {
	private static Gson gson;
	private static final GsonBuilder gsonBuilder = new GsonBuilder();
	private static SampleDto sampleDto;

	@BeforeClass
	public static void createGson() {
		gsonBuilder.registerTypeAdapter(SampleDto.class, new SampleDto("test", LocalDateTime.of(2018, 06, 11, 00, 00)));
		gson = gsonBuilder.create();
	}

	@BeforeClass
	public static void generateData() {
		sampleDto = new SampleDto("test", LocalDateTime.of(2018, 06, 11, 00, 00));
	}

	@Test
	public void testJSON() {
		String json = gson.toJson(sampleDto);
		SampleDto fromJson = gson.fromJson(json, SampleDto.class);
		assertTrue(fromJson.getLocalDateTime().equals(sampleDto.getLocalDateTime()));
	}
}

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