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[eclipselink-users] [ClassName] cannot be merged because it has changed or been deleted since it was last read

Hi,

I retrieve an Entity from the DB, modify it then invoke
EntityManager.merge() on it. For some reason EclipseLink throws this
exception:

javax.persistence.OptimisticLockException: Exception [EclipseLink-5010]
(Eclipse Persistence Services - 1.0 (Build 1.0 - 20080707)):
org.eclipse.persistence.exceptions.OptimisticLockException
Exception Description: The object [Object.toString() goes here] cannot be
merged because it has changed or been deleted since it was last read.
{3}Class> [className goes here]

I'm confused. Isn't the entire point of EntityManager.merge() to push
changes from the in-memory entity back to the database? Shouldn't this work?

Thank you,
Gili
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