如何使用Spring Boot使用CRUDRepository的findOne（）方法？

Question

I want to use the findOne() method of CRUDRepository , but unable to use it.

I am using the CRUDRepository for Persistence. I checked the CRUDRepository, but the findOne() method is not available. When I searched Javadoc of CRUDRepository it shows findOne() method is there.

@Override
    public MultiplicationResultAttempt getResultById(Long resultId) {

        return attemptRepository.findOne(resultId);
    }

Answer 1

findOne was replaced by findById() in CRUD Repository . See DATACMNS-944

Note that findById is not an exact replacement for findOne , it returns an Optional instead of null .

example usage:

@Override
public MultiplicationResultAttempt getResultById(Long resultId) {

   return attemptRepository.findById(id).orElse(null);
}