Java 17: Challenge with Custom Serialization of LocalDate in REST API using Jackson
I keep running into Quick question that's been bugging me - I'm converting an old project and I'm running into a problem while trying to customize the serialization of `java.time.LocalDate` when it gets returned from my Spring Boot REST API using Jackson. I've implemented a custom serializer, but it seems like the default serialization is still being used for some of the responses. Here's the custom serializer I created: ```java import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; import java.io.IOException; import java.time.LocalDate; import java.time.format.DateTimeFormatter; public class LocalDateSerializer extends JsonSerializer<LocalDate> { @Override public void serialize(LocalDate date, JsonGenerator jsonGenerator, SerializerProvider serializers) throws IOException { if (date != null) { jsonGenerator.writeString(date.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"))); } } } ``` I've annotated my entity class with `@JsonSerialize(using = LocalDateSerializer.class)` for the `LocalDate` field, like so: ```java import com.fasterxml.jackson.databind.annotation.JsonSerialize; import java.time.LocalDate; public class Event { private String name; @JsonSerialize(using = LocalDateSerializer.class) private LocalDate eventDate; // Getters and Setters } ``` However, when I invoke the endpoint that returns a list of `Event` objects, the response still shows the date in the default format (ISO-8601). I've tried clearing the cache and ensuring that there are no other serializers conflicting, but the issue persists. Here's how I'm returning the response in my controller: ```java import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController public class EventController { @GetMapping("/events") public List<Event> getEvents() { // Dummy data for testing return List.of(new Event("Sample Event", LocalDate.of(2023, 10, 1))); } } ``` The expected output for the event date should be in the format `yyyy-MM-dd`, but I continue to receive it in the default ISO format. I've also checked my `application.properties` for any configurations related to Jackson, and it seems there are no overriding settings that could affect this. Any insights on what I might be missing or further configurations that I should check? Thanks in advance! I'd really appreciate any guidance on this. I'm developing on macOS with Java. What are your experiences with this?