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

Try in persistence.xml as per http://blogs.nologin.es/rickyepoderi/index.php?/archives/95-Weaving-Problem-in-EclipseLink.html