Hi,
I want to create a one-to-one bi-directional relationship in which both
entities share the same primary key. So, following the example in the docs, I
wrote this:
| @Entity
| public abstract class Customer {
|
| @Id
| @GeneratedValue(strategy = GenerationType.AUTO, generator = "C_SEQ")
| @SequenceGenerator(name = "C_SEQ", sequenceName = "CUSTOMER_SEQ")
| public Integer getId() {
| return id;
| }
|
| ...
|
| @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER, optional
= true)
| @PrimaryKeyJoinColumn
| public CustomerLogin getCustomerLogin() {
| return customerLogin;
| }
| }
|
My other entity looks like this:
| @Entity
| public class CustomerLogin {
|
| @Id
| public Integer getId() {
| return id;
| }
|
| ...
|
| @OneToOne(optional = false, mappedBy = "customerLogin")
| public Customer getCustomer() {
| return customer;
| }
|
Whenever I insert a customer/customerLogin pair I get the following exception:
| org.hibernate.id.IdentifierGenerationException: ids for this class must be
manually assigned before calling save(): CustomerLogin
|
I was hoping that by using automatic ID generation in the customer entity and
annotating the relationship with @PrimaryKeyJoinColumn it would automatically
set the id in CustomerLogin. Note that the id is generated from a sequence in
the database so if I want it to work like this I'd have to save the Customer
entity, so that it would fetch the next id from the sequence, set the ID for
CustomerLogin and then save CustomerLogin. Is there any way to make this
automatic?
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3922639#3922639
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http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3922639
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