Migrate ObjectMapper to JsonMapper

I am currently upgrading my application to Jackson 3.x (and Spring Boot 4.0). I have an existing ObjectMapper bean in Jackson 2 that manually configures JavaTimeModule with specific DateTimeFormatter patterns and several feature toggles.

In Jackson 3, I've noticed that ObjectMapper is now immutable and follows a builder pattern, and the package names have changed from com.fasterxml.jackson to tools.jackson. Additionally, the JavaTimeModule (jsr310) seems to be integrated by default.

@Bean public ObjectMapper objectMapper() { JavaTimeModule module = new JavaTimeModule(); ObjectMapper mapper = new ObjectMapper(); module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ISO_DATE_TIME)); module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ISO_DATE_TIME)); module.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ISO_DATE)); module.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ISO_DATE)); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); mapper.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true); mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); mapper.registerModule(module); mapper.setSerializationInclusion(Include.NON_NULL); return mapper; }

How do I recreate this specific configuration (especially the custom DateTimeFormatter for LocalDateTime and LocalDate) using the new Jackson 3 Builder API? Can I still add custom serializers/deserializers to the "built-in" time support, or should I still register a module?