Support Jackson3 with Spring Boot 4.x when using DefaultObjectSerializer

[atrauzzi]

Encountered a scenario where a dev is customizing Dapr's ObjectMapper by extending DefaultObjectSerializer and modifying the static OBJECT_MAPPER:

static {
  OBJECT_MAPPER.findAndRegisterModules();
  OBJECT_MAPPER.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
  OBJECT_MAPPER.enable(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS);
}

This will break with Jackson 3.x because ObjectMapper/JsonMapper is now fully immutable - configuration must happen at construction time via builder pattern. Methods like disable(), enable(), configure() no longer exist on the mapper instance.

---

Is there an alternative available for people who have made this kind of customization?

cc. @salaboy