Hibernate - 一对多关系和orphanRemoval级联 [英] Hibernate - One to many relationship and orphanRemoval cascade

问题描述

我有一个基本的一对多关系父/子，就像Hibernate参考手册的第21章一样。

级联仅从子级到父级（坚持级联，因为我不想删除父母，如果我删除了一个孩子）。
当我添加一个孩子到家长，我保存孩子，我有一个TransientObjectException ...

  @Entity 
 public class Parent实现Serializable {
 
 @Id 
 @GeneratedValue（strategy = GenerationType.AUTO）
私人长ID; 
 
 @OneToMany（mappedBy =parent，orphanRemoval = true）
 private List< Child>孩子的; 
 
公共列表< Child> getChilds（）{
返回孩子; 
} 
 
 public void setChilds（List< Child> childs）{
 this.childs = childs; 
 
 $ b public void addChild（Child child）{
 if（childs == null）childs = new ArrayList< Child>（）; 
 if（childs.add（child））child.setParent（this）; 
} 
 
 public Long getId（）{
 return id; 
} 
 
 public void setId（Long id）{
 this.id = id; 
 
 
 
 $实际
 public class Child实现Serializable {
 
 @Id 
 @GeneratedValue（strategy = GenerationType .AUTO）
私人长ID; 
 
 @ManyToOne（可选=假）
 @Cascade（{PERSIST，MERGE REFRESH，SAVE_UPDATE，REPLICATE，LOCK，DETACH}）
私人父亲; 
 
 public Parent getParent（）{
 return parent; 
} 
 
 public void setParent（父母）{
 this.parent = parent; 
} 
 
 public Long getId（）{
 return id; 
} 
 
 public void setId（Long id）{
 this.id = id; 
 
 
 
 
 @Test 
 public void test（）{
 Parent parent = new Parent（）; 
 Child child = new Child（）; 
 parent.addChild（child）; 
 genericDao.saveOrUpdate（child）; 
} 
  

但是在saveOrUpdate上，我有这个例外：

  org.hibernate.TransientObjectException：对象引用未保存的瞬态实例 - 在冲洗前保存瞬态实例：Child 
 at org.hibernate.engine。 ForeignKeys.getEntityIdentifierIfNotUnsaved（ForeignKeys.java:244）
 at org.hibernate.collection.AbstractPersistentCollection.getOrphans（AbstractPersistentCollection.java:911）
 at org.hibernate.collection.PersistentBag.getOrphans（PersistentBag.java： 143）
在org.hibernate.engine.CollectionEntry.getOrphans（CollectionEntry.java:373）
在org.hibernate.engine.Cascade.deleteOrphans（Cascade.java:471）
。在组织.hibernate.engine.Cascade.cascadeCollectionElements（Cascade.java:455）
在org.hibernate.engine.Cascade.cascadeCollection（Cascade.java:362）
在org.hibernate.engine.Cascade.cascadeAssociation （Cascade.java:338）
在org.hibernate.engine.Cascade.cascadeProperty（Casc ade.java:204）美元，org.hibernate.engine.Cascade.cascade（Cascade.java:161 B $ B）
在org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave（AbstractSaveEventListener.java:476） 
 at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate（AbstractSaveEventListener.java:354）
 at org.hibernate.event.def.AbstractSaveEventListener.performSave（AbstractSaveEventListener.java:204）
 org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId（AbstractSaveEventListener.java:130）
 at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId（DefaultSaveOrUpdateEventListener.java:210）
 at org.hibernate .event.def.DefaultSaveOrUpdateEventListener.entityIsTransient（DefaultSaveOrUpdateEventListener.java:195）
 at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:117）
 at org.hibernate.event.def .DefaultSaveOrUpdateEventListener .onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:93）
 at org.hibernate.impl.SessionImpl.fireSaveOrUpdate（SessionImpl.java:677）
 at org.hibernate.impl.SessionImpl.saveOrUpdate（SessionImpl.java:669 ）在org.hibernate.engine.CascadingAction $ 5.cascade 
（CascadingAction.java:252）
在org.hibernate.engine.Cascade.cascadeToOne（Cascade.java:392）
。在组织.hibernate.engine.Cascade.cascadeAssociation（Cascade.java:335）
在org.hibernate.engine.Cascade.cascadeProperty（Cascade.java:204）
在org.hibernate.engine.Cascade.cascade （Cascade.java:161）
 at org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave（AbstractSaveEventListener.java:451）
 at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate（AbstractSaveEventListener.java ：288）
在org.hibernate.event.def.AbstractSaveEventListener.performSave（AbstractSaveEventListener.java:204）
在org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedI （org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient（DefaultSaveOrUpdateEventListener）中的
。 Java的：195），美元，org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:117 b $ b）
在org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:93）在org.hibernate.impl.SessionImpl.fireSaveOrUpdate（SessionImpl.java:677）
 
在org.hibernate.impl.SessionImpl.saveOrUpdate（SessionImpl.java:669）
在org.hibernate作为.impl.SessionImpl.saveOrUpdate（SessionImpl.java:665）
  

我真的不明白，因为保存孩子应该通过级联保存家长...
任何想法？

更新1

概率lem似乎与orphanRemoval有关，因为如果我在父项上注释它：

  @OneToMany（mappedBy =parent / *，orphanRemoval = true * /）
私人列表< Child>孩子的; 
  

它有效！

它保存了孩子，然后是父母。 >
但是我真的需要通过级联删除孤儿，当我从父母中移除一个孩子时。

更新2

我创建了一个JIRA问题：

http://opensource.atlassian.com/projects/hibernate/browse/HHH-5364

UPDATE 3

这似乎是固定的:-)

http://opensource.atlassian.com/projects/hibernate/browse/HHH-2269

解决方案

这是Hibernate中的一个问题，现在已经修复：

http://opensource.atlassian.com/projects/hibernate/browse/HHH -2269

I have a basic one to many relation parent / child like in the chapter 21 of Hibernate references book.
The cascade is only from child to parent (persist cascade only because I don't want to delete the parent if I delete a child).
When I add a child to the parent and I save the child, I have a TransientObjectException...

@Entity
public class Parent implements Serializable {

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

  @OneToMany(mappedBy = "parent", orphanRemoval = true)
  private List<Child> childs;

  public List<Child> getChilds() {
    return childs;
  }

  public void setChilds(List<Child> childs) {
    this.childs = childs;
  }

  public void addChild(Child child) {
    if (childs == null) childs = new ArrayList<Child>();
    if (childs.add(child)) child.setParent(this);
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }
}

@Entity
public class Child implements Serializable {

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

  @ManyToOne(optional = false)
  @Cascade( { PERSIST, MERGE, REFRESH, SAVE_UPDATE, REPLICATE, LOCK, DETACH })
  private Parent parent;

  public Parent getParent() {
    return parent;
  }

  public void setParent(Parent parent) {
    this.parent = parent;
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }
}


@Test
public void test() {
  Parent parent = new Parent();
  Child child = new Child();
  parent.addChild(child);
  genericDao.saveOrUpdate(child);
}

But on the saveOrUpdate, I have this exception:

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: Child
  at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:244)
  at org.hibernate.collection.AbstractPersistentCollection.getOrphans(AbstractPersistentCollection.java:911)
  at org.hibernate.collection.PersistentBag.getOrphans(PersistentBag.java:143)
  at org.hibernate.engine.CollectionEntry.getOrphans(CollectionEntry.java:373)
  at org.hibernate.engine.Cascade.deleteOrphans(Cascade.java:471)
  at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:455)
  at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:362)
  at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:338)
  at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
  at org.hibernate.engine.Cascade.cascade(Cascade.java:161)
  at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:476)
  at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:354)
  at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
  at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
  at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:677)
  at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:669)
  at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:252)
  at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392)
  at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335)
  at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
  at org.hibernate.engine.Cascade.cascade(Cascade.java:161)
  at org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:451)
  at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
  at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
  at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
  at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
  at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:677)
  at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:669)
  at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:665)

I really don't understand because saving the Child should save the Parent via the cascade... Any ideas ?

UPDATE 1
The problem seems to be related to "orphanRemoval" because if I comment it on the parent:

@OneToMany(mappedBy = "parent" /*, orphanRemoval = true */)
private List<Child> childs;

It works!
It save the child, then the parent.
But I really need the orphan to be deleted via the cascade when I remove a child from its parent.

UPDATE 2
I've created a JIRA issue:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5364

UPDATE 3
It seems to be fixed :-)
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2269

解决方案

It was an issue in Hibernate and it is now fixed:

http://opensource.atlassian.com/projects/hibernate/browse/HHH-2269

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