@PrimaryKeyJoinColumn - exception
lysy78 Jan 16, 2011 7:59 AMHello,
I've dicided to try one-to-one relation using @PrimaryKeyJoinColumn. But i cannot force it to work.
Environment:
- AS: jboss-6.0.0.Final
- java version "1.6.0_23"
Problem description:
I have two entities: Customer, Address. Relation between Customer and address is bidirectional one-to-one. The relation uses primary keys.
You can see created entity beans below:
@Entity @Table(name="CUSTOMER") public class Customer implements Serializable{ @Id @Column(name="CUSTOMER_ID", nullable=false) @GeneratedValue(strategy=GenerationType.AUTO) private Integer customerId; ... //bidirectional @OneToOne(fetch=FetchType.EAGER, cascade=CascadeType.ALL, optional=true) @PrimaryKeyJoinColumn private Address address; ... }
@Entity @Table(name="ADDRESS") public class Address implements Serializable{ @Id @Column(name="ADDRESS_ID", nullable=false) @GeneratedValue(generator="foreignGenerator") @GenericGenerator( name="foreignGenerator", strategy="foreign", parameters={@Parameter(name="property", value="customer" )}) private Integer addressId; ... @OneToOne(mappedBy="address", fetch=FetchType.LAZY, optional=false) private Customer customer; ... }
As you see i'm using @GeneratedValue and @GenericGenerator to be sure that address_id will be the same as customer_id.
Unfortunately that doesn't work.
I tried to run code (from remote client):
Customer customer = new Customer(); ... //set customer fields Address address = new Address(); ... //set addres fields customer.setAddress(address);address.setCustomer(customer); databaseManager.createCustomer(customer); //persist
This is implementation of method createCustomer.
public void createCustomerCore(Customer customer){ entityManager.persist(customer); }
Unfortunately when i try to persist customer with address i get this exception:
Exception in thread "main" javax.ejb.EJBTransactionRolledbackException: org.hibernate.id.IdentifierGenerationException: null id generated for:class hl.test.relations.entity.Address CMTTxInterceptor.java:148) at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.handleInCallerTx( ...
I thought that i would get the same id for Address as for Customer. But i got exeption and i don't know why.
Could you guys help me find out where is the reason of the exception and how to fix my code?
Thank you in advance
Hubert