How to solve the “failed to lazily initialize a collection of role” Hibernate exception

By using the hibernate `@Transactional` annotation, if you get an object from the database with lazy fetched attributes, you can simply get these by fetching these attributes like this :

@Transactional
public void checkTicketSalePresence(UUID ticketUuid, UUID saleUuid) {
Optional<Ticket> savedTicketOpt = ticketRepository.findById(ticketUuid);
savedTicketOpt.ifPresent(ticket -> {
Optional<Sale> saleOpt = ticket.getSales().stream().filter(sale -> sale.getUuid() == saleUuid).findFirst();
assertThat(saleOpt).isPresent();
});
}

Here, in an Hibernate proxy-managed transaction, the fact of calling `ticket.getSales()` do another query to fetch sales because you explicitly asked it.