advanced~4h
Concurrency — Optimistic & Pessimistic Locking, MVCC
Two concurrent transactions touching the same row is unavoidable in any real application — @Version-based optimistic locking and JPA's pessimistic lock modes are the concrete tools for handling that collision correctly.
Learning objectives
- Implement optimistic locking via @Version and handle OptimisticLockException with a retry strategy.
- Implement pessimistic locking via LockModeType and explain what it guarantees that optimistic locking doesn't.
- Choose the correct locking strategy for a given contention level and correctness requirement.
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Concurrency — Optimistic & Pessimistic Locking, MVCC