👀 Views: 63 💬 Answers: 1 📅 Created: 2025-06-14

hibernate spring jpa Java

I'm working on a project and hit a roadblock. I keep running into I'm working with an scenario with optimistic locking in Hibernate when dealing with detached entities. I have an entity called `Product` that has a version field annotated with `@Version` to manage concurrency. Here's the relevant part of my entity: ```java @Entity public class Product { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; private BigDecimal price; @Version private Long version; // Getters and setters } ``` I load a `Product` from the database, make some updates, and then detach it by using the `entityManager.detach(product)` method. Later, I try to merge the product back into the session. However, when I call `entityManager.merge(product)`, I get an behavior: ``` Could not execute JDBC batch update; SQL state [23000]; behavior code [23505]; duplicate key value violates unique constraint ``` This seems to occur because the version field is not being updated correctly. I've tried explicitly setting the version property before merging, but it still throws the same exception. I also checked that the `Product` entity is not being modified by another transaction in between. Additionally, I have transaction management enabled through Spring. Here's the service method where I'm handling the merge: ```java @Transactional public void updateProduct(Product product) { entityManager.merge(product); } ``` I suspect that this might be an scenario with how Hibernate is handling the versioning for detached entities. Is there a way to ensure that the version is correctly managed during the merge process? Any insights would be greatly appreciated! The stack includes Java and several other technologies. I'm using Java 3.10 in this project. Hoping someone can shed some light on this.