CODEWITHSUNDEEP
javasqlhibernatejakarta-eejpa
Jasper
Jasper

Reputation: 8705

JPA - PersistenceUtil.isLoaded - its loaded in which EntityManager?

Question:
PersistenceUtil.isLoaded is evaluated by looking at which EntityManager or is it L2 Cache? After all Entities are loaded by only one of these.

PersistenceUtil.isLoaded method definition says:
"Determine the load state of an entity. This method can be used to determine the load state of an entity passed as a reference." But there is no mention of loaded where?

Upvotes: 1

Views: 1017

Answers (2)

Piotr Kochański
Piotr Kochański

Reputation: 22672

I've checked the source code with the implementation of this interface. Looks like isLoaded is going over all defined persistent providers and checks if entity is attached to any of them.

As a result you can't know to which EntityManager your entity is bound.

Upvotes: 1

Tassos Bassoukos
Tassos Bassoukos

Reputation: 16142

Entities in JPA are attached to an entity manager, and there's plumbing to help you with that - see f.e. clear(), contains(), merge() in EntityManager alone.

Usually entities are attached to the EntityManager that created them. It's not a good idea to mix entities from different EntityManagers.

Upvotes: 1

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