@Service
@RequiredArgsConstructor
@Slf4j
public class TableService<E extends Parent> {
private final TableRepository<E> tableRepository;
}

@Repository (или NoRepositoryBean)
public interface TableRepository<E extends Parent>{
}

    @Override
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public <T extends ParentDto> T saveCaseDocWithAttachment(@NonNull final Long caseId,
                                                              @NonNull final T dto,
                                                              final MultipartFile[] attachment,
                                                              @NonNull final Function<ParentEntity, T> mapper)
            throws IOException, NoSuchAlgorithmException {
        ParentEntity parentEntity = saveCaseDocEntity(caseId, dto);
        if (attachment != null) {
            for (MultipartFile attachmentFile : attachment) {
                docEntity = saveCaseDocAttachment(dto, attachmentFile, parentEntity);
            }
        }
        return mapper.apply(docEntity);
    }