public static Customer createCreditCard(EntityManagerFactory factory, Customer cust) {
CreditCard card = new CreditCard();
card.setExpirationDate(new java.util.Date());
card.setNumber("4444-4444-4444-4444");
card.setNameOnCard("William Burke");
card.setCreditOrganization("Capital One");
card.setCustomer(cust);
EntityManager manager = factory.createEntityManager();
try {
manager.getTransaction().begin();
manager.persist(card);
manager.getTransaction().commit();
// Show that card.getCustomer() returns null
manager.clear();
CreditCard cardCopy = manager.find(CreditCard.class, card.getId());
System.out.println("should be null: " + cardCopy.getCustomer());
manager.getTransaction().begin();
System.out.println("now set the owning side of the relationship");
Customer custCopy = manager.find(Customer.class, cust.getId());
custCopy.setCreditCard(cardCopy);
manager.getTransaction().commit();
manager.clear();
cardCopy = manager.find(CreditCard.class, card.getId());
System.out.println("should be set now: " + cardCopy.getCustomer().getFirstName());
} finally {
manager.close();
}
return cust;
}