What qualifies as being "already persistent"? 

Does that mean an entity whose equals() test returns true, or does it look at 
the @Entity definition at the Id and/or @Column(unique=true) fields only? 

Also, does it drill down to the actual database layer at insertion time for 
tables with unique constraints but no corresponding annotation defined on the 
entity? Or does that come back as a different kind of error?

I haven't seen this documented anywhere, so I'm wondering...

Thanks.

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