Planned lessonMID-016-L02

Pessimistic locking from JPA

On This Lesson 4 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

lock rows from JPA when conflicts are likely.

@Lock(LockModeType.PESSIMISTIC_WRITE) on a repository query issues SELECT ... FOR UPDATE.
PESSIMISTIC_READ maps to FOR SHARE (verify dialect behavior before recording).
Set a lock timeout hint (jakarta.persistence.lock.timeout) so threads do not wait forever.
Locks are held to the end of the transaction; keep it short.

Draft outline details

java

@Lock(LockModeType.PESSIMISTIC_WRITE)
@Query("select s from Stock s where s.productId = :id")
Optional<Stock> findForUpdate(Long id);

When is the lock released?

Show answer

When the transaction commits or rolls back.

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