Hi,

I have an many-to-many relationship mapped with annotations
as below:

@Entity
Class User {

// ...some
attributes
private Set<UserGroup> userGroups;

@OneToMany(fetch = FetchType.EAGER, mappedBy = "User",
cascade=CascadeType.ALL)
@org.hibernate.annotations.Cascade(value =
org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
public Set
getUserGroups() { return this.userGroups; }
// getter/setter(s)

}


@Entity
Class Group {
// ...some
attributes
private Set<UserGroup> userGroups;

@OneToMany(fetch = FetchType.EAGER, mappedBy = "Group",
cascade=CascadeType.ALL)
@org.hibernate.annotations.Cascade(value =
org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
public Set
getUserGroups() { return this.userGroups; }
// getter/setter(s)
}


@Entity
Class UserGroup {
// ...some
attributes
private User user;
private Group group;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name =
"userId", nullable = false, insertable = false, updatable =
false)
public User getUser() { return this.user }

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name =
"groupId", nullable = false, insertable = false, updatable =
false)
public Group getGroup() { return this.group }

}

I am updating the UserGroup by doing:

user.getUserGroups().remove(userGroup1);
entityManager.merge(user);

I am getting this exception:

Caused by: org.hibernate.ObjectDeletedException: deleted entity
passed to persist: [UserGroup#<null>]
at
org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:90)
at
org.hibernate.impl.SessionImpl.firePersistOnFlush(SessionImpl.java:644)
at
org.hibernate.impl.SessionImpl.persistOnFlush(SessionImpl.java:636)
at
org.hibernate.engine.CascadingAction$9.cascade(CascadingAction.java:323)
at
org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
at
org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
at
org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
at
org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296)
at
org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
at
org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
at
org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
at
org.hibernate.engine.Cascade.cascade(Cascade.java:130)
at
org.hibernate.event.def.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:131)
at
org.hibernate.event.def.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:122)
at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:65)
at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at
org.hibernate.transaction.JTATransaction.commit(JTATransaction.java:135)
at
org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)
at
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:456)


If i remove cascade=CascadeType.ALL from Group entity i
don't get any exception but i want to keep cascade in Group entity.
Is there anything i need to do to get rid of this exception or I should
remove cascade in Group entity?

Thanks,

Could anyone please let me know

Looks like the entity you are trying to delete has a null id, so Hibernate doesn't know what to delete in the database.

[quote="Cameron McKenzie"]Looks like the entity you are trying to delete has a null id, so Hibernate doesn't know what to delete in the database.[/quote]

I am sure the id is not null. I am doing List<UserGroup> userGroups = group.getUserGroups()

Once i get list of userGroups, depending on certain criteria i am deleting a particular userGroup. So the id is not null.

Thanks