interface « EntityManager « JPA Q&A

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1. Is it necessary to call a flush() (JPA interface) in this situation?    stackoverflow.com

Because calling a flush() to get every entities persist from memory to database. So if I use call too much unnecessary flush(), it could take much time therefore not a good ...

2. Is javax.persistence.entitymanager is a JPA interface?    stackoverflow.com

Today I've confused. is javax.persistence.entitymanager a JPA interface? Thanks