hibernate - これはコールリーク接続を挿入しますか

Question

これはコールリーク接続を挿入しますか

EntityManagerFactory emf = Persistence.createEntityManagerFactory("foo");
EntityManager em = emf.createEntityManager();
transaction = em.getTransaction();
transaction.begin();

try {
    transaction.begin();
     // insert call goes here
    em.flush();
    transaction.commit();
} catch (Exception e) {
    if (transaction != null && transaction.isActive()) {
        transaction.rollback();
    }
} finally {
    if (em != null) {
        em.close();
        emf.close();
    }
}