Question

我在JPA 2中的孤儿删除存在问题。在事务内部，我创建了一对一关系的目标对象（OrderDirectDebit），然后将其添加到现有的持久性DonationIntent（使用合并方法）。然后我通过使其无效来删除关系。然后我再次坚持（再次使用合并方法）。

我为关系配置了orphanRemoval，但仍未删除该对象。规范说当调用刷新操作时应用remove操作（一旦事务结束就应该发生）。但在我的例子中，孤立的实体在提交后仍然存在。当我在合并操作（在我的自定义持久化方法中）手动调用flush后，孤立实体将被删除。如果我在使用相同持久化上下文（来自拦截器）的不同实体管理器上手动调用刷新操作，则孤立实体不会被删除。

我无法理解这种行为。合并后我是否必须直接手动调用？这有任何意义吗？请评论。以下是我的类定义，存储库的持久化方法和单元测试代码：

    // this is a method of a stateless bean with transaction required
    // it is run inside an arquillian unit test
    public void testOrderCreation() {
    DonationIntent donation = repositoryDonationIntent.findById(id);
    Country country = testhelper.getCountryGermany();
    BankAccount bankAccount =testhelper.getBankAccountForTestPerson1();
    Assert.assertFalse(donation.createOrderDirectDebit(23.0d, country, OrderType.EState.NEW, bankAccount).hasErrors());
    donation = repositoryDonationIntent.persist(donation);
    Assert.assertNotNull(donation.getOrder());
    donation.setOrder(null);
    donation = repositoryDonationIntent.persist(donation);
    Assert.assertTrue(repositoryDonationIntent.findById(donation.getId()) == donation);
    Assert.assertNull(repositoryDonationIntent.findById(donation.getId()).getOrder());
    //the assert verifies the the relation of the object in the persistence context is null,still after commit it does not remove it
    }

实体模型：

    @Entity
    public class DonationIntent extends AutoIdDomainObject implements IAggregateRoot<Long> {

    @OneToOne(cascade = CascadeType.ALL, optional = true, orphanRemoval = true)
    private OrderType order; // this is the relation that does not get orphaned
    }

    @Entity
    @Inheritance(strategy = InheritanceType.JOINED)
    public abstract class OrderType extends AutoIdDomainObject {

    // some more attributes and relations here

    }


    @Entity
    public class OrderDirectDebit extends OrderType {

     // some more attributes and relations here
    }

存储库的持久化方法：

    @Override
public <D extends IDomainObject<?>> D persist(Class<D> domainClass, D domainObject)      {
    //TODO Do not permit old revisions of versioned objects to be persisted
    if (domainObject == null)
        return null;
    // invalid domain objects may not be persisted
    if (!domainObject.isValid()) {
        DomainObjectErrorLogger.log(domainObject.getErrors());
        return domainObject;
    }

    // check if update or insert
    if (isPersistent(domainClass, domainObject)) {
        domainObject = em.merge(domainObject);
        em.flush(); // a call to flush here will remove orphaned entity
    } else {
        em.persist(domainObject);

    }

    return domainObject;
}

JPA2 + Hibernate 4：Orphan删除（orphanRemoval = true）无法与OneToOne一起使用

0 个答案: