intermediateHibernate Architecture — SessionFactory, Session, EntityManager

Why doesn't Spring Boot make you manually create an EntityManager for every request?

Spring's @Transactional and dependency injection transparently obtain a fresh, request-scoped EntityManager from the one shared EntityManagerFactory for you, and close it when the transaction completes — this is exactly why most Spring Boot code never directly references EntityManagerFactory at all, even though it's working correctly underneath every repository call.

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