MonthDaySerializer does not serialize objects into array

Unlike YearMonthSerializer serialize objects as array " [2018, 5]", MonthDaySerializer serialize to “–03-02”

I notice document say, what should i do :

NOTE: unlike many other date/time type serializers, this serializer will only use Array notation if explicitly instructed to do so with JsonFormat (either directly or through per-type defaults) and NOT with global defaults.

I use org.springframework.boot:spring-boot-starter-web:2.1.3.RELEASE, com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.9.8, com.fasterxml.jackson.module:jackson-module-kotlin:2.9.8

application.yml

  jackson:
    serialization:
      INDENT_OUTPUT: false
      WRITE_DATES_AS_TIMESTAMPS: true

[cowtowncoder]

Ok finally got around to this one.

So: for some reason, original implementation defaulted to textual, not array-based, and since there is no way to distinguish “left as default” setting for use-timestamps from explicit, indication has to be done some other way. There are 2 main mechanisms: annotation with @JsonFormat and “config overrides”.

Former is

    static class Wrapper {
        @JsonFormat(shape = JsonFormat.Shape.ARRAY) // or NUMBER
        public MonthDay value;
    }

and config overrides something like

objectMapper.configOverride(MonthDay.class)
    .setFormat(JsonFormat.Value.forShape(JsonFormat.Shape.ARRAY);

Now: these work, but it seems that deserialization part does NOT actually work at this point. So I’ll leave the issue open for now. I will add tests for serialization for 2.9, but deserialization fix probably needs to go in 2.10.0.

[cowtowncoder]

Closing this, follow-up under #121.