Am I supposed to call EntityManager.clear() often to avoid memory leaks?

java jpa memory-leaks openjpa entitymanager
RubenLaguna picture RubenLaguna · Feb 11, 2010 · Viewed 19.2k times · Source

I'm new to JPA/OpenJPA and I noticed that if I don't call EntityManager.clear() after i persist entities I get an OutOfMemoryError (I keep adding new entities in a loop). I'm not sure if this is the expected behavior or it's just and OpenJPA 1.2.1 glitch.

So, am I required to explicitly detach the entities myself? If I'm not, it's a good practice anyway?

Answer

Padmarag picture Padmarag · Feb 11, 2010

I don't have much experience with JPA. However this'll be useful -
In JPA you must either:
- Create a new EntityManager for each transaction.
- Call clear() after each transaction to clear the persistence context.

Related questions

How to fix the Hibernate "object references an unsaved transient instance - save the transient instance before flushing" error

I receive following error when I save the object using Hibernate object references an unsaved transient instance - save the transient instance before flushing

Read More
What's the difference between JPA and Hibernate?

I understand that JPA 2 is a specification and Hibernate is a tool for ORM. Also, I understand that Hibernate has more features than JPA 2. But from a practical point of view, what really is the difference? I have experience using …

Read More
Difference between FetchType LAZY and EAGER in Java Persistence API?

I am a newbie to Java Persistence API and Hibernate. What is the difference between FetchType.LAZY and FetchType.EAGER in Java Persistence API?

Read More