@Test
    public void persistInLoopTest() {
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("PersistenceUnit");
        EntityManager entityManager = entityManagerFactory.createEntityManager();
        EntityTransaction transaction = entityManager.getTransaction();
        int counter = 0;
        
        while (true) {
            Employee employee = new Employee();
            transaction.begin();
            try {
                entityManager.persist(employee);
                transaction.commit();
                Assert.assertTrue("Failed to persist employee", employee.getId() > 0);
                System.out.println("Persisted " + ++counter + " employees so far");
            } catch (Exception x) {
                if(transaction.isActive()) {
                    transaction.rollback();
                }
                Assert.fail("Error persisting employee: " + x.getMessage());
            }
        }
    }

    @Test
    public void persistInLoopSingleTransactionTest() {
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("PersistenceUnit");
        EntityManager entityManager = entityManagerFactory.createEntityManager();
        EntityTransaction transaction = entityManager.getTransaction();
        transaction.begin();

        Employee employee = null;
        for(int i=0; i<100000; i++) {
            employee = new Employee();
            try {
                entityManager.persist(employee);
                Assert.assertTrue("Failed to persist employee", employee.getId() > 0);
                System.out.println("Persisted " + (i+1) + " employees so far");
            } catch (Exception x) {
                if(transaction.isActive()) {
                    transaction.rollback();
                }
                Assert.fail("Error persisting employee: " + x.getMessage());
            }
        }
        transaction.commit();

        entityManagerFactory.getCache().evictAll();
        EntityManager newEntityManager = entityManagerFactory.createEntityManager();
        Assert.assertNotNull("Employee not found in database", newEntityManager.find(Employee.class, employee.getId()));
    }