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From DonBrady <dbr...@pobox.com>
Subject Re: Replacing Entities while Managed
Date Wed, 08 Nov 2006 00:55:20 GMT

Surely.


(1) We do a find method which returns an entity A from the database.

(2) We also have an unmanaged entity instance B separately, that we created
outside any persistence context, whose values we wish to use to update those
in A, and then rewrite A to the database.

(3) We just set the key of B to that of A (namely "48") and do a "merge." 
This worked to update A in TopLink Essentials.

(4) Under OpenJPA, we get the exact error message:

> An object of type "com.xxx.entity.entities.FeCmeCommittee" with oid  
> "48"
> already exists in this context; another cannot be persisted.
>

(5) This seems wrong.  The reason the two objects have the same id is
precisely that we want to update the existing entity.


THANK YOU.

Don



Craig L Russell wrote:
> 
> Hi Don,
> 
> Could you please be just a bit more specific about what you are  
> trying to do and what error you encounter?
> 
> Thanks,
> 
> Craig
> 
> On Nov 7, 2006, at 2:50 PM, DonBrady wrote:
> 
>>
>> We are converting a TopLink Essentials application to OpenJPA
>>
>> Under Toplink Essentials, we could replace a managed entity with  
>> another
>> that had the same identity (key) by doing a merge.
>>
>> When we try this in OpenJPA, we get the following error:
>>
>> An object of type "com.xxx.entity.entities.FeCmeCommittee" with oid  
>> "48"
>> already exists in this context; another cannot be persisted.
>>
>> However, "48" is actually the identity or key, not the oid.  The  
>> oid's are
>> different.     They key is the same and therefore it should be  
>> possible to
>> replace it via a merge.
>>
>> Or am I missing something?
>>
>> Thanks,
>>
>> Don
>>
>>
>> -- 
>> View this message in context: http://www.nabble.com/Replacing- 
>> Entities-while-Managed-tf2592059.html#a7229110
>> Sent from the open-jpa-dev mailing list archive at Nabble.com.
>>
> 
> Craig Russell
> Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
> 408 276-5638 mailto:Craig.Russell@sun.com
> P.S. A good JDO? O, Gasp!
> 
> 
>  
> 

-- 
View this message in context: http://www.nabble.com/Replacing-Entities-while-Managed-tf2592059.html#a7230848
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