How does an entity get an ID before a transaction is committed in JPA/Play?

Question

See this question.

It turns out that even without committing the transaction manually, before the TX is committed, the person has an ID after calling the save() meth

Answer 1

Between begintransaction and commit, after call save or update method, you should use:

EntityManagerHelper.getEntityManager().flush();

If you dont call it, the Object will be lost and cant be save to DB.

So after call it, you will take id of it in object.