How can I clone an attached object of EclipseLink

Question

How can I created a detached copy of an attached object I've got from the entity manager?
I don't want to detach the original one, I want to create a copy of it while making sure that changes on the copied object won't effect the database.
I need to copy the attached object since it contains changes which were not yet written to the database. Afterwards I want to continue and working with the attached object (and do more changes).

Answer 1

Didn't test this so can't guarantee it'll work, but you can try something like this ( em.detach() available since JPA 2.0)

MyEntity m1 = em.find(MyEntity.class, 1);
em.detach(m1);
MyEntity m2 = em.find(MyEntity.class, 1);

m2 should be attached, while m1 remains detached.