How to distinguish between null and not provided values for partial updates in Spring Rest Controller

Question

I\'m trying to distinguish between null values and not provided values when partially updating an entity with PUT request method in Spring Rest Controller.

Consider

Answer 1

Probably to late but following code works for me to distinguish between null and not provided values

if(dto.getIban() == null){
  log.info("Iban value is not provided");
}else if(dto.getIban().orElse(null) == null){
  log.info("Iban is provided and has null value");
}else{
  log.info("Iban value is : " + dto.getIban().get());
}