I found the bug:
The checkout method must return the order returned by the entity manager.
| @Stateless
| public class WarehouseBean implements Warehouse {
|
| @PersistenceContext(unitName="ECB")
| EntityManager entityManager;
|
| @TransactionAttribute(TransactionAttributeType.MANDATORY)
| public Order checkout(Order order) {
| return this.entityManager.merge(order);
| //wrong: return order
| }
| }
|
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