Cannot serialize org.joda.time.Days

[bestbugwriter]

I found jackson-datatype-joda is also has a serializer com.fasterxml.jackson.datatype.joda.deser.PeriodDeserializer，and Days does implements the ReadablePeriod interface.
but I don't known why it is not work.

https://stackoverflow.com/questions/79535991/joda-date-time-type-org-joda-time-days-not-supported-by-default?noredirect=1#comment140269178_79535991

I used joda 2.10.14 time and jackson 2.18.3,

jackson-core-2.18.3.jar
jackson-databind-2.18.3.jar
jackson-datatype-joda-2.18.3.jar
joda-time-2.10.14.jar

I have register JodaModule, but it also throw Exception, my code is

public static void main(String[] args) throws JsonProcessingException {
    DateTime dateTime = new DateTime();
    Days days = Days.days(1);
    Map<String, Object> map = new HashMap<>();
    map.put("dateTime", dateTime);
    map.put("days", days);
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JodaModule());
    String json = objectMapper.writeValueAsString(map);
    System.out.println(json);
}

the exception

Exception in thread "main" com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Joda date/time type `org.joda.time.Days` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-joda" to enable handling (through reference chain: java.util.HashMap["days"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1340)
at com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer.serialize(UnsupportedTypeSerializer.java:35)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:808)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:764)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:720)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:35)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:502)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:341)
at com.fasterxml.jackson.databind.ObjectMapper._writeValueAndClose(ObjectMapper.java:4819)
at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:4060)
at azkaban.utils.JSONUtils.main(JSONUtils.java:96)

I checked JodaModule code, found that it is not add Days deserializer, but has PeriodDeserializer. So, how should I resolve this issue?

[cowtowncoder]

There is some confusion here: what you are trying to do is Serialize (write as json) not Deserialize. I will fix the title.

But aside from that, yes, does look like some handling may be missing.
Thank you for reporting the issue.

[cowtowncoder]

cc @JooHyukKim -- date/time issue if you are interested :)

[bestbugwriter]

@cowtowncoder Sorry, I just checked your reply. I found that some other classes similar to Days, such as Hours and Years, also don't work. Do I need to write a serialization and deserialization class for each of them separately?

this is my code:

    public static void main(String[] args) throws IOException {

        Map<String, Object> map = new HashMap<>();
        map.put("dateTime",  new DateTime());
        map.put("years", Years.years(1));
        map.put("months", Months.months(2));
        map.put("weeks", Weeks.weeks(3));
        map.put("days", Days.days(4));
        map.put("hours", Hours.hours(5));
        map.put("minutes", Minutes.minutes(6));
        map.put("seconds", Seconds.seconds(7));


        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(new JodaModule());

        String json = objectMapper.writeValueAsString(map);
        System.out.println(json);

        String json1 = "{\"dateTime\":1743059899339,\"hours\":\"5h\",\"seconds\":\"7s\",\"months\":\"2M\",\"weeks\":\"3w\",\"minutes\":\"6m\",\"days\":\"4d\",\"years\":\"1y\"}";
        System.out.println(objectMapper.readValue(json1, Map.class));
    }

and this is my exception:

Exception in thread "main" com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Joda date/time type `org.joda.time.Hours` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-joda" to enable handling (through reference chain: java.util.HashMap["hours"])
	at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
	at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1340)
	at com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer.serialize(UnsupportedTypeSerializer.java:35)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:808)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:764)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:720)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:35)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:502)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:341)
	at com.fasterxml.jackson.databind.ObjectMapper._writeValueAndClose(ObjectMapper.java:4819)
	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:4060)
	at azkaban.utils.JSONUtils.main(JSONUtils.java:353)

[JooHyukKim]

@bestbugwriter Could you open another issue regarding those?
Implementation should be simliar to #161, best if you could implement serializer for the missing ones as well, but I will try to do it when I find time.

[bestbugwriter]

@bestbugwriter您能针对这些问题再开一个问题吗？实现方式应该与#161 类似，最好能为缺失的那些也实现序列化器，不过我会在有时间的时候尝试这样做。

ok #162

[cowtowncoder]

@bestbugwriter Like @JooHyukKim said, we do need issues to add support for types with missing support. Looks like you already did that, thanks!