Java Hibernate集合在更新时为空

考虑以下几点：

@Entity
public class MainEntity {


    @OneToOne(orphanRemoval = true, cascade = CascadeType.ALL)
    private ChildEntity childEntity;
}

@Entity
public class ChildEntity {


    @OneToMany(cascade = CascadeType.ALL)
    @LazyCollection(FALSE)
    private List<AnotherEntity> otherEntities;
}

一切都很好，然后我做了一些更新，在交易结束后很久

final ChildEntity anotherNewChild = new ChildEntity();
anotherNewChild.addOtherEntity(anotherEntity); //Several Entities can be added here
mainEntity.setChildEntity(anotherNewChild);

//A log of LOG.info(mainEntity); shows all fields appropriately set
//At some point during merge operation, the new ChildEntity will need to be persisted.
 //According to my logs, an invocation of EntityManager.persist(anotherNewChild) occurs, during as the merge is propagated to the new entity.
//At this point is where the ChildEntity.otherEntities is detected to be null
return EntityManager.merge(mainEntity); 

问题是，使用persist时

列表

在Hibernate问题跟踪程序上打开了一个问题

问题是merge返回一个新实体，因此您应该执行以下操作：

mainEntity = EntityManager.merge(mainEntity);

我就是这么做的。因为我执行远程ejb调用，所以我不会返回除此之外的任何内容。请看我对这个问题的编辑
mainEntity = EntityManager.merge(mainEntity);