How to migrate the serialization format of java8 time

[wwtao1024]

The following code is the way to set the serialization format of java8 time in Jackson2. How to migrate to Jackson3

ObjectMapper mapper = new ObjectMapper();
JavaTimeModule module = new JavaTimeModule();
module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
mapper.registerModule(module);

[pjfanning]

An AI tool is faster than asking and waiting for humans in 2025.
You can read https://github.com/FasterXML/jackson/blob/main/jackson3/MIGRATING_TO_JACKSON_3.md

JavaTimeModule is now built-in so you don't explicitly register it anymore.

[wwtao1024]

I need to adjust the date serialization output format of java8 to "yyyy-MM-dd HH: mm: ss", but the current default output format is datetimeFormatter #ISO_ZONED_DATE_TIME

[pjfanning]

Please use English. I translated your text and you seem to want to remove the time zone details from the output because the format is already ISO8601.

[pjfanning]

What have you tried? You shouldn't expect volunteers to do all the work for you. As in, what Jackson 3 code have you tried?

[pjfanning]

https://github.com/FasterXML/jackson-databind/blob/e74aa50a49e9025f3902538d983eaef4a16e166d/src/test/java/tools/jackson/databind/ext/javatime/ser/TestLocalDateTimeSerializationWithCustomFormatter.java#L27 is some code that you could look at

[wwtao1024]

I successfully adjusted the output format of java8 dates to the format I wanted using the following code. Thank you

@configuration
public class JacksonConfig {

public static final String PATTERN = "yyyy-MM-dd HH:mm:ss";

@Bean
@Primary
public JsonMapper jacksonJsonMapper() {
    SimpleModule dateModule = new SimpleModule().addSerializer(Long.class, ToStringSerializer.instance);
    SimpleModule dateTimeModule = new SimpleModule().addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(PATTERN)))
            .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(PATTERN)));
    return JsonMapper.builder()
            .addModule(dateModule)
            .addModule(dateTimeModule)
            .defaultDateFormat(new SimpleDateFormat(PATTERN))
            .defaultTimeZone(TimeZone.getDefault())
            .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL))
            .changeDefaultPropertyInclusion(incl -> incl.withContentInclusion(JsonInclude.Include.NON_NULL))
            .build();
}

}