Not Null Property Exception with JPA onetoone mapping - jpa-2.0

Question

I am trying my way around JPA but I cant get this to work the way I understand them.
Its the onetoone bidirectional mapping between an Order and an OrderInvoice class which is a required
association
My entities are marked as this
#Entity
#Table(name = "Orders")
public class Order {
#Id
#GeneratedValue
#Column(name = "ORDER_ID")
private int orderId;
#OneToOne(optional=false,cascade=CascadeType.ALL, mappedBy="order", targetEntity=OrderInvoice.class)
private OrderInvoice invoice;
}
#Entity
#Table(name = "ORDER_INVOICE")
public class OrderInvoice {
#Id
#GeneratedValue
#Column(name = "INVOICE_ID", nullable = false)
private int invoiceId;
#OneToOne(optional = false)
#JoinColumn(name="ORDER_ID")
private Order order;
}
My test class is like this.
#Test
public void createOrder() {
Order order = createOrderImpl();
assertNotNull(order);
}
private Order createOrderImpl() {
OrderInvoice orderInvoice = new OrderInvoice(new Date(), 100.0, null,
null, new Date());
Order order = new Order(100.0, "JOHN Doe's Order", new Date(), new Date(),orderInvoice);
orderDao.create(order);
return order;
}
But I am encountering below problem when I run my Test
javax.persistence.PersistenceException: org.hibernate.PropertyValueException: not-null property references a null or transient value: order.OrderInvoice.order
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
Caused by: org.hibernate.PropertyValueException: not-null property references a null or transient value: order.OrderInvoice.order
at org.hibernate.engine.Nullability.checkNullability(Nullability.java:95)

Answer 1

try to
orderInvoice.setOrder(order);
orderDao.create(order);