java - 合并现有对象不会更新数据库中更改的@Embedded

Question

我正在使用 Eclipselink 的 Amdatu 实现来实现 OSGI 兼容性。

有人能找出为什么这不起作用吗？

下面的类被定义为实体并且应该被持久化。每次更新 Ptz2PlPalletUnloadOrder 时，OrderRepoImpl 中的 save 方法会将持久订单与更新版本合并，其中 Ptz2PlPalletUnloadDefinition def 或 OrderState orderState 已更改。

无论如何，我可以使用 em.merge 方法更新数据库中的 orderState，但无法更新 BD 中的 @Embedded def 对象。高度推荐更新而不在数据库中创建新行。

合并对象时不会引发异常，log4j 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;
    }
}

通过该方法制动时，结果值是正确的。因此，人们会期望数据库已更新，但当 Ptz2PlPalletUnloadOrder 的待更新字段是嵌入对象时，这种不幸的情况不会发生。

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

我已在 amdatu-jpa 测试用例中重现了此内容。

在 EclipseLink 论坛上发现类似问题 https://www.eclipse.org/forums/index.php/t/474144/

禁用编织可以解决我创建的测试中的问题。要禁用，请将以下属性添加到 persistence.xml

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