合并现有对象不会更新数据库中嵌入的已更改的@

Question

为了实现OSGI兼容性，我使用Eclipselink的Amdatu实现。

有人能发现为什么这不起作用吗？

下面的类被定义为一个实体，应该持久化。每次对Ptz2PlPalletUnloadOrder，进行更新时，OrderRepoImpl中的保存方法都会将持久化顺序与更新后的版本合并，其中已更改了Ptz2PlPalletUnloadDefinition def或 orderState orderState。

无论如何，我可以使用orderState方法更新数据库中的em.merge，但不能更新BD中的@Embedded def对象。在数据库中不生成新行的情况下进行更新是非常可取的。

当合并对象时，不抛出异常，log4j将包含在问题的底部。

Ptz2PlPalletUnloadOrder

@Entity(name = Ptz2PlPalletUnloadOrder.TABLE_NAME)
@Table(name = Ptz2PlPalletUnloadOrder.TABLE_NAME)
public class Ptz2PlPalletUnloadOrder implements Order {
    public static final String TYPE = "ptz2pl.pallet.unload";
    public static final String TABLE_NAME = "order_ptz2pl_pallet_unload";

    // Order ID
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long dbId;

    @Temporal(TemporalType.TIMESTAMP)
    private Date created = new Date();

    // States
    @Enumerated(EnumType.STRING)
    private OrderState orderState = OrderState.NEW;

    @Embedded
    private Ptz2PlPalletUnloadDefinition def;
}

Ptz2PlPalletUnloadDefinition

持久化类。

@Embeddable
public class Ptz2PlPalletUnloadDefinition {

    @Embedded
    private Station station;
    private volatile Integer agvId;
    private volatile String agvSystemName;
    @Temporal(TemporalType.TIMESTAMP)
    private Date deadLine;
    private String userId;
    private Long palletType;

    private Ptz2PlPalletUnloadDefinition() {

    }
}

OrderRepoImpl

@Transactional
@Component(provide = ManagedTransactional.class)
public class OrderRepoImpl implements OrderRepo, ManagedTransactional {

    private EntityManager em;

    @Override
    public Ptz2PlPalletUnloadOrder save(Ptz2PlPalletUnloadOrder order) {
        Ptz2PlPalletUnloadOrder result = em.merge(order);
        return result;
    }
}

当制动通过该方法时，结果值具有正确的值。因此，人们会期望数据库已经更新，但是当Ptz2PlPalletUnloadOrder的要更新字段是一个嵌入式对象时，就不会发生这种不幸的情况。

日志

[EL Finer]: 2016-02-09 15:25:32.393--ServerSession(1465675217)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--client acquired: 2038620953
[EL Finer]: 2016-02-09 15:25:32.393--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--TX binding to tx mgr, status=STATUS_ACTIVE
[EL Finer]: 2016-02-09 15:25:32.394--ClientSession(2038620953)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--acquire unit of work: 769186
[EL Finest]: 2016-02-09 15:25:32.395--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--Merge clone with references Ptz2PlPalletUnloadOrder [id=1, orderState=QUEUED, location=Location [stationId=10, systemName=BEING], allocatedAgvId=null, allocatedAgvSystemName=null]
[EL Finer]: 2016-02-09 15:25:37.014--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--TX beforeCompletion callback, status=STATUS_ACTIVE
[EL Finer]: 2016-02-09 15:25:37.015--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--begin unit of work commit
[EL Finer]: 2016-02-09 15:25:37.016--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--TX afterCompletion callback, status=COMMITTED
[EL Finer]: 2016-02-09 15:25:37.017--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--end unit of work commit
[EL Finer]: 2016-02-09 15:25:37.018--UnitOfWork(769186)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--release unit of work
[EL Finer]: 2016-02-09 15:25:37.019--ClientSession(2038620953)--Thread(Thread[pool-7-thread-4,5,Configuration Admin Service])--client released

Answer 1

我在一个amdatu-jpa的测试案例中复制了这个。

在EclipseLink论坛https://www.eclipse.org/forums/index.php/t/474144/上发现了一个类似的问题

禁用编织解决了我创建的测试中的问题。禁用将下面的属性添加到persistence.xml

<property name="eclipselink.weaving" value="false"/>