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.getTransaction().commit(); System.out.println("add product id : "+prod.id ... ); em.getTransaction().commit(); System.out.println("add product id ... > lo Hoel I finally managed to get it working by using merge when commit fails on persist

. The EntityTransaction instance may be used serially to begin and commit multiple

data into cache when read from database and when committed into database. Forces refresh of cache

into cache when read from database and when committed into database: this is the default behavior

, and in afterCompletion for commit with RetainValues false and rollback with RestoreValues false

at commit. Unlike makePersistent , which makes the closure of the instance

so that a subsequent commit is more likely to succeed. Outside a transaction, this method

>) If true , at commit instances

instances, following the data store commit or rollback operation. Only one

until commit time. If an implementation does not support this option, a