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From Adam Furmanczuk <afurmanc...@knowtrek.com>
Subject Cannot join on constant field - more specific
Date Thu, 31 Jan 2013 17:18:48 GMT
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Hi,

need to be more specific here:

@OneToMany(mappedBy="stampOwner", cascade =
CascadeType.ALL,fetch=FetchType.LAZY)
@JoinTable(name="TEMPSTAMP",
    		joinColumns={
@JoinColumn(name="STAMPOWNER_DID", referencedColumnName="DID"),
@JoinColumn(name="TEMPSTAMP.TEMPTYPE", referencedColumnName="OUTGING")	
    	})
private List<TempStamp> tempOutgoingList;
// similar other three lists but with other constant
[..]

> When device and its lists get persisted, all database entries are 
> correct. Problem is with retrieving. Suppoose I have device with 4
> lists with n elements each different
values.
> When retrieving devices with a TypedQuery, I always end up, with 4
> elements in each list having all the same value.

I need to correct, I end up in every list with 4 * n elements.
so my whole JoinTable annotation has no effect.



As to my issue with merge():

List<Device> runtimeList;
// I retrieve its objects  with:
TypedQuery<Device> dQuery = em.createQuery("select d from Device d",
				Device.class);

when running merge/persitance I iterate over that list and use:

EntityTransaction tx = em.getTransaction();
tx.begin();
for(Device dSaved : runtimeList){
 Device dfound = em.find(WRG.class, savedDevice.getId());
 if (dfound != null) {
  dSaved = em.merge(dfound);
 } else {
  em.persist(dSaved);
}
}
tx.commit();

> Now, when I would run  em.merge(dSaved) instead of em.merge(dFound)
> I get the Error:

> "An object of type <X> with oid <Y> already exists in this context 
> another cannot be persisted"

Merging the Object I just found causes no error, but I never get new
values, as all changes are loaded from databases and current discarded.

Thanks for help, greetings,

Adam

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