@Service
public class IntegrationService {
    @Autowired
    StockService stockService;

    @Autowired
    SessionFactory sessionFactory

    @Transactional
    public void doSomething() {
        StockIssue issue = stockService.getStockIssue();
        Session s = sessionFactory.openSession();
        s.merge(issue);
        issue.getStockTransactionHeaderBatches();
    }
}