Java 8 date/time type `java.time.LocalDateTime` not supported by default

[esfomeado]

Describe the bug
I have upgrade Jackson from 2.11.4 to 2.12.3 and not I get this exception:

Java 8 date/time type java.time.LocalDateTime not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling

Now I have to explicitly register the JavaTimeModule(). Is there any behavior change?

Thanks

Version information
2.12.3

To Reproduce
https://github.com/esfomeado/jackson-test

Java 8

Expected behavior
Should work the same way has the previous version.

Additional context
Spring Boot 2.5

[cowtowncoder]

This is intentional, see #2683: Java 8 date/time values should NOT be serialized as POJOs by default because that representation has caused lots of issues -- it cannot be read back.

[esfomeado]

Just saw as well your comment on #3091.
That should fix my problem if it goes on 2.13.

Thanks

[cowtowncoder]

@esfomeado Ah, yes. Did the code sample use convertValue()? One thing #3091 could use is actual reproduction of the issue (wrt convertValue() or use with JsonNode)... to verify that fix works.

[Tuegor]

Hey, nice chit-chat between you two, but how to fix this one after all? I've added the dependency to POM as was required, but still it's not working!

[GedMarc]

ObjectMapper.registerModule.....

[Tuegor]

Thanks, found this one already.

[gautamkumargojoko]

ObjectMapper.registerModule.....

I dont understand why but it is not working for me!!

[AndyCodez]

ObjectMapper.registerModule.....

I dont understand why but it is not working for me!!

@gautamkumargojoko were you able to solve this?

[gautamkumargojoko]

ObjectMapper.registerModule.....

I dont understand why but it is not working for me!!

@gautamkumargojoko were you able to solve this?

after adding this to Config file

 @Bean
  public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    Jackson2ObjectMapperBuilder builder =
        new Jackson2ObjectMapperBuilder()
            .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
            .serializers(
                new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZ")))
            .serializationInclusion(JsonInclude.Include.NON_NULL);
    return new MappingJackson2HttpMessageConverter(builder.build());
  }

and added these annotations :

  @JsonSerialize(using = LocalDateTimeSerializer.class)
  @JsonDeserialize(using = LocalDateTimeDeserializer.class)
  @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", shape = JsonFormat.Shape.STRING)
  private LocalDateTime createdAt;

then it worked for me

[cowtowncoder]

It should NOT be necessary -- and I would recommend against -- add @JsonSerialize / @JsonDeserialize settings.
Instead the DateTimeModule should be registered, to avoid having to do that.