Issues with Custom Jackson Serializer for LocalDateTime Not Formatting Correctly
I've searched everywhere and can't find a clear answer. I'm working on a personal project and I've searched everywhere and can't find a clear answer..... I'm facing an issue with a custom serializer for `LocalDateTime` when using Jackson in my Spring Boot application. I implemented a serializer to format the `LocalDateTime` into a specific string format, but the serialization doesn't seem to work as expected. Here's the custom serializer I created: ```java import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.databind.SerializerProvider; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import com.fasterxml.jackson.databind.JsonSerializer; import java.io.IOException; import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> { private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); @Override public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException { gen.writeString(value.format(formatter)); } } ``` I used this serializer in my entity class like this: ```java import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import com.fasterxml.jackson.databind.annotation.JsonSerialize; @Entity public class Event { @Id @GeneratedValue private Long id; @JsonSerialize(using = LocalDateTimeSerializer.class) private LocalDateTime eventTime; // Getters and Setters } ``` However, when I send a request to create a new `Event`, the response body still shows the `LocalDateTime` in the default format (ISO-8601). I made sure to include the `@JsonSerialize` annotation above the `eventTime` field, but it seems like Jackson is ignoring my custom serializer altogether. I've tried using different configurations by adding the following to my `application.properties`: ``` spring.jackson.serialization.write-dates-as-timestamps=false ``` But this did not resolve the issue. I also ensured that my `LocalDateTime` is not being wrapped or modified by any other part of my code. Has anyone else encountered this issue or knows how to enforce the custom serialization properly? Any insights would be greatly appreciated! For context: I'm using Java on Windows. My development environment is Ubuntu. Any help would be greatly appreciated! This is my first time working with Java LTS. For reference, this is a production application. What's the best practice here?