父类中有一个列表List。保存父项后，已添加或更改的子项应通过hibernate保存/更新。

我找到了很多解释，但是，我只是没有使它起作用。

Parent.class试试A

@Entity
public class Parent {
// id and other attributes
@OneToMany(mappedBy = "parent")
@org.hibernate.annotations.Cascade(org.hibernate.annotations.CascadeType.ALL)
protected List<child> children;

Parent.class试试B

@Entity
public class Parent {
// id and other attributes
  @OneToMany(mappedBy = "parent", cascade = { javax.persistence.CascadeType.ALL },
 orphanRemoval = true)
 @org.hibernate.annotations.Cascade({ 
 org.hibernate.annotations.CascadeType.PERSIST,
 org.hibernate.annotations.CascadeType.MERGE,
 org.hibernate.annotations.CascadeType.REFRESH,
 org.hibernate.annotations.CascadeType.SAVE_UPDATE,
 org.hibernate.annotations.CascadeType.REPLICATE,
 org.hibernate.annotations.CascadeType.LOCK,
 org.hibernate.annotations.CascadeType.DETACH })
protected List<child> children;

孩子被添加到新的父母。之后两者都保存

sessionFactory.getCurrentSession().saveOrUpdate(parent);

但是在冲洗时，出现以下错误：

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: de.pockettaxi.backend.model.ride.RideSingle
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:243)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:456)
at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:265)
at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:275)
at org.hibernate.type.TypeHelper.findDirty(TypeHelper.java:295)
at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3378)
at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:520)
at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:230)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:154)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)

有人看到我的错误吗？

非常感谢！！