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From Abe White <awh...@bea.com>
Subject Re: Replacing Entities while Managed
Date Wed, 08 Nov 2006 17:29:13 GMT
> The merge operation takes as a parameter a detached instance, not a  
> new instance.
>
> TopLink Essentials might not be able to tell the difference between  
> a detached and a new instance. So it might work in that environment.
>
> But the behavior you're describing is not portable.
>

That said, you can probably fool OpenJPA into attaching a new  
instance if you want to.  The documentation describes the general  
heuristics OpenJPA uses to determine whether an instance is detached:

http://incubator.apache.org/openjpa/docs/latest/manual/ 
manual.html#ref_guide_attach_behavior



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