Entitymanager.flush() VS EntityManager.getTransaction().commit - What should I prefer?

Question

What should I prefer when updating the database? What are the pros & cons with either method and when shall I use the one or the other?

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Answer 1

You did read the javadoc for flush and commit and know that flush is only for use within a transaction? It flushes (but doesn't commit), whereas commit commits data (obviously). They are distinct; there is no "preference" to be had. The first example is wrong, and should result in an exception on calling flush (TransactionRequiredException)