Explicit locking in JPAStorageService

[Etienne Dysli-Metref]

I'm reading the current unreleased code of
org.opensaml.storage.impl.JPAStorageService and seeing it is often
requesting locking (with javax.persistence.LockModeType), especially
pessimistic locking. Could someone explain the rationale behind
requesting specific lock types instead of, for example, letting the
database decide which locking level is appropriate for a query?

Cheers,
   Etienne

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