Jackson Fasterxml Convert Map to Bean

The bean: AllowTime.java

@JsonSerialize(using = CustomLocalTimeSerializer.class)
@JsonDeserialize(using = TimeToLocalTimeDeserializer.class)
LocalTime rmt_start;

@JsonSerialize(using = LocalDateToMiguoSerializer.class)
@JsonDeserialize(using = TimestampToLocalDateDeserializer.class)
LocalDate start_date;

Serializer1 : LocalDateToMiguoSerializer

public class LocalDateToMiguoSerializer extends LocalDateSerializer {

	private static final long serialVersionUID = 1L;

	@Override
	public void serialize(LocalDate value, JsonGenerator g, SerializerProvider provider) throws IOException {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyMMdd");

		MinguoChronology minguo = MinguoChronology.INSTANCE;
		String result = formatter.format(minguo.dateEpochDay(value.toEpochDay()));

		g.writeString(result);
	}

}

Serializer2 : CustomLocalTimeSerializer

public class CustomLocalTimeSerializer extends LocalTimeSerializer {

	private static final long serialVersionUID = 1L;

	@Override
	public void serialize(LocalTime value, JsonGenerator g, SerializerProvider provider) throws IOException {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HHmm");

		String result = formatter.format(value);

		g.writeString(result);
	}

}

Deserializer1 : TimeToLocalTimeDeserializer

public class TimeToLocalTimeDeserializer extends JsonDeserializer<LocalTime> {

	@Override
	public LocalTime deserialize(JsonParser jp, DeserializationContext dc) throws IOException, JsonProcessingException {
		return jp.readValueAs(Time.class).toLocalTime();
	}
}

由於都會用 Lombok 來簡化 setter/getter 就設定了:

@Setter(onMethod_={@JsonProperty(value="RMT_START")})
LocalTime rmt_start;

結果 ObjectManage 如果沒有 register 指定的 Deserializer, 則在 deserialize map 成 bean 時, 就會一直拋出：
no constructor long integer…
然後測了很久, 才知道是這個 @Setter 的問題。

另外也才知道, 其實可以不用在 bean 裡用 annotation 指定 serializer、deserializer,
也可以在 Object Manager 指定。

好像兩邊都有道理, 尤其如果 serializer 是在 Object Manager 要執行時才指定,
那就可以依據 view 的需求, serialize 成需要的格式。