What is JPA entity locking and how does it work?

What is JPA entity locking and how does it work?

JPA entity locking is a mechanism to prevent concurrent modifications of entities in a database. It ensures data integrity.

What are the different types of locking available in JPA?

There are two main types of locking in JPA: Optimistic Locking and Pessimistic Locking. Optimistic Locking assumes that multiple transactions can complete without affecting each other, while Pessimistic Locking prevents other transactions from accessing the data until the lock is released.

When should I use optimistic locking over pessimistic locking?

Use optimistic locking when conflicts are rare and you want better performance. Pessimistic locking is better for high contention scenarios.

Can you give an example of how to implement optimistic locking in JPA?

Sure! You can implement optimistic locking by adding a version field to your entity. JPA will automatically check this version before updating the entity.