How Can I Format Java 8's LocalDate with Jackson Without Annotations?

Formatting Java 8's LocalDate with Jackson

Jackson's annotation-based formatting for java.util.Date extends seamlessly to LocalDate fields in Java 8. To achieve this, avoid using annotations and instead employ Jackson's ContextResolver in conjunction with the JavaTimeModule.

ContextResolver:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;

@Provider
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> {  
    private final ObjectMapper MAPPER;

    public ObjectMapperContextResolver() {
        MAPPER = new ObjectMapper();
        MAPPER.registerModule(new JavaTimeModule());
        MAPPER.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return MAPPER;
    }  
}

Resource Class:

import java.time.LocalDate;

@Path("person")
public class LocalDateResource {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response getPerson() {
        Person person = new Person();
        person.birthDate = LocalDate.now();
        return Response.ok(person).build();
    }

    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createPerson(Person person) {
        return Response.ok(
                DateTimeFormatter.ISO_DATE.format(person.birthDate)).build();
    }

    public static class Person {
        public LocalDate birthDate;
    }
}

Testing:

Using this approach, you should be able to serialize and deserialize LocalDate values as JSON strings using the ISO-8601 format.

For more information, refer to the JSR310 module documentation.

Note:

As of Jackson version 2.7, the JSR310Module is deprecated. Use the JavaTimeModule instead.

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