Merge an entity, change its id, merge again, cause “mapped to a primary key column in the database. Updates are not allowed” error

Question

I have a JPA program where EclipseLink is the Persistence provider. When I merge an user entity, change its ID, and try to merge the same user instance again, an error is thrown

Answer 1

It seems to be an bug of EclipseLink. I have changed the persistence provider from EclipseLink to Hibernate:

from

org.eclipse.persistence.jpa.PersistenceProvider

to

org.hibernate.ejb.HibernatePersistence  

No error has been thrown.

The version of EclipseLink is 2.3.2. (which is shipped with the latest Glassfish application server 3.1.2).

The version of hibernate is, as of now the latest, 4.1.7.