[jboss-user] [EJB 3.0] - Re: Detached Entity passed to persist

[jaikiran]

When you return the entity back to the client from the bean, it becomes 
detached from the entitymanager. When you are passing the entity back to the 
bean, the second time, you have the option to call the 

mergedEntity = entityManager.merge(entity);

to re-attach the detached entity.

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[jboss-user] [EJB 3.0] - Re: detached entity passed to persist

[PeterJ]

This means that you entity is not being managed by the entity manager. Try 
merging it back in with EntityManager.merge() before persisting the changes.


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[jboss-user] [EJB 3.0] - Re: detached entity passed to persist

[icordoba]

I see this is an old thread but just in case someone nees a solution... try to 
enclose everyting in a UserTransaction. If you take an EJB3 entity outside the 
transaction, you cannot re-persist it or iterate over CMRs, etc. You need then 
a UserTransaction in the client side.

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[jboss-user] [EJB 3.0] - Re: detached entity passed to persist

[fhh]

Can  you try with id set to null? I have a feeling the the entity manager might 
think that your object has already been persisted because it already has an id.

Regards

Felix


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[jboss-user] [EJB 3.0] - Re: detached entity passed to persist

[fhh]

Let me guess: An object with the id 0 does already exist since you ran your 
code at least once before.

Regards

Felix

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[jboss-user] [EJB 3.0] - Re: detached entity passed to persist

[graflaszlo]

Hi Felix, 

No, the table is empty, I try to insert the first record.
I tried with id = 1, but with the same result.

Any idea?

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[jboss-user] [EJB 3.0] - Re: Detached entity passed to persist

[jactor]

Please help me this so I can avoid the big head ache...

After a variety of debugging, this is the case:


  | ...
  | B b = a.getB();
  | long id = saveOrUpdate(b); // Autoboxing. Originally an instance of 
Long
  | entityManager.flush();
  | b.setId(id);  // Autoboxing. Originally an instance of Long
  | ...
  |  

I discovered that the memory referance of b.getId() was put to null when I 
flushed the entity manager. Before the flushing I had done some logging, but it 
was not valid anymore.

However; after flushing, persisting/merging A, and logging that b.getId() is  
still a valid value, I still get the same exception:


  | javax.ejb.EJBException: javax.persistence.PersistenceException: 
org.hibernate.PersistentObjectException: detached entity passed to persist: 
a.package.B
  | 

Is there some sort of configuration that I did not do? I thought that the merge 
method would check that the id of the entity was valid.

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