SO - 24489963 - mappedBy

test-output.log

[main] DEBUG so.services.OrderServiceTest - >>> Persisting original SO question Order
Hibernate: 
    insert 
    into
        WAITERENTITY
        (id, name) 
    values
        (null, ?)
Hibernate: 
    insert 
    into
        ORDERENTITY
        (orderNumber, finalized, sumOfMoney, waiter_id) 
    values
        (null, ?, ?, ?)
[main] DEBUG so.services.OrderServiceTest - <<<Persisted original SO question Order
[main] DEBUG so.services.OrderServiceTest - >>> Adding OrderEntity maintaining both relationships
Hibernate: 
    select
        waiterenti0_.id as id1_1_0_,
        waiterenti0_.name as name2_1_0_,
        orders1_.waiter_id as waiter_i4_1_1_,
        orders1_.orderNumber as orderNum1_0_1_,
        orders1_.orderNumber as orderNum1_0_2_,
        orders1_.finalized as finalize2_0_2_,
        orders1_.sumOfMoney as sumOfMon3_0_2_,
        orders1_.waiter_id as waiter_i4_0_2_ 
    from
        WAITERENTITY waiterenti0_ 
    left outer join
        ORDERENTITY orders1_ 
            on waiterenti0_.id=orders1_.waiter_id 
    where
        waiterenti0_.id=?
Hibernate: 
    insert 
    into
        ORDERENTITY
        (orderNumber, finalized, sumOfMoney, waiter_id) 
    values
        (null, ?, ?, ?)
[main] DEBUG so.services.OrderServiceTest - >>> Adding OrderEntity without maintaining inverse side
Hibernate: 
    select
        waiterenti0_.id as id1_1_0_,
        waiterenti0_.name as name2_1_0_,
        orders1_.waiter_id as waiter_i4_1_1_,
        orders1_.orderNumber as orderNum1_0_1_,
        orders1_.orderNumber as orderNum1_0_2_,
        orders1_.finalized as finalize2_0_2_,
        orders1_.sumOfMoney as sumOfMon3_0_2_,
        orders1_.waiter_id as waiter_i4_0_2_ 
    from
        WAITERENTITY waiterenti0_ 
    left outer join
        ORDERENTITY orders1_ 
            on waiterenti0_.id=orders1_.waiter_id 
    where
        waiterenti0_.id=?
Hibernate: 
    insert 
    into
        ORDERENTITY
        (orderNumber, finalized, sumOfMoney, waiter_id) 
    values
        (null, ?, ?, ?)
Hibernate: 
    select
        waiterenti0_.id as id1_1_0_,
        waiterenti0_.name as name2_1_0_,
        orders1_.waiter_id as waiter_i4_1_1_,
        orders1_.orderNumber as orderNum1_0_1_,
        orders1_.orderNumber as orderNum1_0_2_,
        orders1_.finalized as finalize2_0_2_,
        orders1_.sumOfMoney as sumOfMon3_0_2_,
        orders1_.waiter_id as waiter_i4_0_2_ 
    from
        WAITERENTITY waiterenti0_ 
    left outer join
        ORDERENTITY orders1_ 
            on waiterenti0_.id=orders1_.waiter_id 
    where
        waiterenti0_.id=?

WaiterEntity.java

@Entity
@XmlRootElement
@Table(name = "WAITERENTITY")
public class WaiterEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String name;

    @OneToMany(mappedBy = "waiter", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
    private List<OrderEntity> orders Z= new ArrayList<>();

    ...
}

Same test as https://gist.github.com/donovanmuller/d9b06edc2bfb00e0fe64#file-orderservicetest-java

Note from line 36 compared to the non mappedBy version from line 36 that there is no extra update for the waiter_id on OrderEntity.