Force Milliseconds When Serializing Instant to ISO8601 using Jackson

Question

I have some questions related to JSON serialization using Jackson in a project where I use Spring Boot 2.0.0.M6, Spring Framework 5.0.1.R

Answer 1

I solve using this aproach:

ObjectMapper objectMapper = new ObjectMapper();
JavaTimeModule module = new JavaTimeModule();
module.addSerializer(Instant.class, new InstantSerializerWithMilliSecondPrecision());
objectMapper.registerModule(module);

And for InstantSerializerWithMilliSecondPrecision i used this:

public class InstantSerializerWithMilliSecondPrecision extends InstantSerializer {

    public InstantSerializerWithMilliSecondPrecision() {
        super(InstantSerializer.INSTANCE, false, new DateTimeFormatterBuilder().appendInstant(3).toFormatter());
    }
}

Now the Instant serialization always includes milliseconds. Example: 2019-09-27T02:59:59.000Z