My use case:

1. Read data
2. Save data to DB
3. Invoke REST service that will read just saved data

The trouble is that the current transaction is not committed and the called service does not see them. I tried to split the method to more methods that have their own transaction.

@Service
public class ReportService {
    private final MyFeignClient feignClient;

    @EventListener
    @Transactional(propagation = Propagation.REQUIRED)
    public void handleUploadedFile(MyEvent event) {
        final var dataHeader = saveReportData(event);
        validate(dataHeader);
    }

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public DataHeader saveReportData(MyEvent event) {
        var dataHeader = DataHeader.builder()
                .event(event)
                .createdTs(LocalDateTime.now())
                .build();
        return dataHeaderRepository.save(dataHeader);
    }

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void validate(DataHeader dataHeader) {
        try {
            final var response = feignClient.execute(ValidateRequest.builder()
                    .dataHeaderId(dataHeader.getId())
                    .build());
        } catch (Exception e) {
            log.error("Failed for DataHeader {}", e, dataHeader.getId());
        }
    }
}

What I am considering is to manage transactions manually, unless there is a better way.