Hibernate Projection approach in project

With using this approach we can get any of field of entity and this way is more efficient rather than get all entity fileds , example in below:

@Repository

public interface CompanyRepo extends JpaRepository<Company, Long> {

    Integer countById(long id);

    <T extends CompanyViewProtocol> Optional<T> findById(long id, Class<T> type);

}

public interface CompanyViewProtocol {

}

public interface ContactDetailView extends CompanyViewProtocol {

    CompanyContactDetail getContactDetail();

}

in there companyRepo.findById(1L,ContactDetailView.class)  

gives us CompanyContactDetail