How do I configure a default format for Instant or LocalDateTime values when using Jackson3

[ledents]

I tried to configure a default DateFormat format on the JsonMapper, but this one is not used by Instant objects.
In version 2 I just installed a Simple Module with a serializer for the Instant class, but I couldn't figure out how to do it in Jackson 3.

[pjfanning]

Installing a module has barely changed. JsonMapper.builder.addModule.

[ledents]

Thanks for your reply, I'll have to look how to migrate my previous SimpleModule to a Jackson Module, but in the mean time the solution of @cowtowncoder is just what I needed and looks much simpler that having to create a module and registering it.

[cowtowncoder]

SimpleModule should still work with 3.x FWTW.

[cowtowncoder]

Java 8 Date/Time, including Instant is built-in for Jackson 3. Note that DateFormat is only for java.util.Date / Calendar; Java 8 types cannot use that class for config.

But do not try registering Instant handlers separately; Config Overrides with JsonFormat.Value.forPattern() is the way to go. I do not remember call off-hand but there are unit tests for it, f.ex src/test/java/tools/jackson/databind/ext/javatime/deser/InstantDeserTest.java:

ObjectMapper mapper = JsonMapper.builder()
    .withConfigOverride(Instant.class,
      o -> o.setFormat(JsonFormat.Value.forPattern(<MY INSTANT PATTERN>))
   .build();

and so on for other types

[ledents]

This works for me and it is much simpler than the previous code. Thanks.

[cowtowncoder]

@ledents You are welcome! Happy I could help.