Grokking Spring Boot
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How @Transactional Works

These lines, among others, appeared in the log when Ana booked seat A12, with debug logging turned on for Spring's JPA transaction manager:

Creating new transaction with name [com.example.booking.bookings.BookingService.book]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
Opened new EntityManager [SessionImpl(1473237843<open>)] for JPA transaction
Participating in existing transaction
Initiating transaction commit
Committing JPA transaction on EntityManager [SessionImpl(1473237843<open>)]
Closing JPA EntityManager after transaction

The method BookingService

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