GeneralService.java

Order order0 = new Order(michaelCustomer);
order0.setCreated(new GregorianCalendar(2019, 1, 9)); // Attention.
order0.addItem(new OrderItem(order0, bread, 5));
order0.addItem(new OrderItem(order0, butter, 7));
orderRepo.save(order0);


Order.java

@Entity
@Getter
@Setter
@Table(name = "orders")
@NoArgsConstructor
public class Order extends BaseEntity {


    @NotNull
    @CreationTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    private java.util.Calendar created;



PostgreSQL

customer_order=# select * from orders;
 id | commentary |         created         | status | updated |                 uuid                 | customer_id
----+------------+-------------------------+--------+---------+--------------------------------------+-------------
  6 |            | 2020-11-23 17:51:14.582 |      1 |         | 93f8ff1c-f24f-48c7-8852-ad3621705f58 |           3
  9 |            | 2020-11-23 17:51:14.618 |      1 |         | 6bc1a8ee-50c1-473a-9c28-f4644caa8e48 |           3
 11 |            | 2020-11-23 17:51:14.668 |      1 |         | f77bdf55-67d5-466c-8635-33d98383b3a3 |           4
 14 |            | 2020-11-23 17:51:14.701 |      1 |         | fbe5e44b-cebc-4e58-9cec-0b4a3af486b3 |           3