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JPA Tutorials - Locking and Concurrency
  1. Optimistic Locking and Use of @Version annotation
  2. OptimisticLockException
  3. Updating Entity Relationship and Version Attribute
  4. Explicitly setting a LockModeType
  5. Using OPTIMISTIC_FORCE_INCREMENT lock mode to force version increment
  6. When to use OPTIMISTIC_FORCE_INCREMENT lock mode?
  7. Using Pessimistic Locking
  8. Using Multiple Pessimistic read Locks
  9. PessimisticLockException