Spring boot with hibernate first level cache

Question

I called CrudRepository#findById two times inside the same method, it displayed in console one select statement. why the second select statement doesn't displayed in the second method call.

here is the service code:

@Service
@RequiredArgsConstructor
public class AccountService {
    private final AccountReporitory accountReporitory;

    public void find() {
        final Account account1 = accountReporitory.findById(1L).get();
        final Account account2 = accountReporitory.findById(1L).get();
    }
}

here is the repository code:

public interface AccountReporitory extends JpaRepository<Account, Long> {
}

You have the answer in your question title. It seems you already know what is going on. — Jens Schauder
– Jens Schauder, Commented May 18, 2021 at 8:18
Does this answer your question? Spring JpaRepository is not returning updated data — Jens Schauder
– Jens Schauder, Commented May 18, 2021 at 8:21

Jens Schauder · Accepted Answer · 2021-05-19 05:10:02Z

1

When you make the first call to findById(1L) the resulting entity is placed in the session's first level cache. Any succeeding calls to findById() with the same id in the same session will result in the entity manager retrieving the entity from the first level cache instead of performing a database query. This is one of the primary purposes of the first level cache.

edited May 19, 2021 at 5:10

Jens Schauder

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answered May 18, 2021 at 13:44

Lee Greiner

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