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Query: Closing JPA EntityManagerFactory for persistence unit ‘default’
Answer: When working with JPA (Java Persistence API), the EntityManagerFactory is responsible for creating EntityManager instances. It represents a factory for creating EntityManagers, and it is typically initialized only once during the application’s lifecycle.
It is important to properly close the EntityManagerFactory when you no longer need it, mainly to release any resources it may have acquired.
Example:
// Creating the EntityManagerFactory
EntityManagerFactory emf = Persistence.createEntityManagerFactory("default");
// Retrieving an EntityManager from the factory
EntityManager em = emf.createEntityManager();
// Perform database operations using the EntityManager
// Closing the EntityManager
em.close();
// Closing the EntityManagerFactory
emf.close();
In the above example, we first create the EntityManagerFactory using the Persistence class and the persistence unit name ‘default’. Then, we retrieve an EntityManager from the factory to perform database operations. Once we are done with the EntityManager, we close it. Finally, we close the EntityManagerFactory.
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