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@PrimaryKeyJoinColumn - exception
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created by <a href="http://community.jboss.org/people/lysy78">Hubert Lyczek</a> in <i>EJB3</i> - <a href="http://community.jboss.org/message/581026#581026">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I've dicided to try one-to-one relation using @PrimaryKeyJoinColumn. But i cannot force it to work.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Environment:</p><p>- AS: jboss-6.0.0.Final</p><p>- java version "1.6.0_23"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Problem description:</p><p>I have two entities: Customer, Address. Relation between Customer and address is bidirectional one-to-one. The relation  uses primary keys.</p><p>You can see created entity beans below:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Entity
@Table(name=<font color="red">"CUSTOMER"</font>)
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> Customer <font color="navy"><b>implements</b></font> Serializable<font color="navy">{</font>
 
     @Id
     @Column(name=<font color="red">"CUSTOMER_ID"</font>, nullable=<font color="navy"><b>false</b></font>)
     @GeneratedValue(strategy=GenerationType.AUTO)
     <font color="navy"><b>private</b></font> Integer customerId;
 
     ...
 
     <font color="darkgreen">//bidirectional</font>
     @OneToOne(fetch=FetchType.EAGER, cascade=CascadeType.ALL, optional=<font color="navy"><b>true</b></font>)
     @PrimaryKeyJoinColumn
     <font color="navy"><b>private</b></font> Address address; 
     ...
<font color="navy">}</font>
 
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">@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;
     ...
}
 
</code></pre><p><br/>As you see i'm using @GeneratedValue and @GenericGenerator to be sure that address_id will be the same as customer_id.</p><p>Unfortunately that doesn't work.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I tried to run code (from remote client):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">Customer customer = <font color="navy"><b>new</b></font> Customer();
...          <font color="darkgreen">//set customer fields</font>
Address address = <font color="navy"><b>new</b></font> Address();
...          <font color="darkgreen">//set addres fields</font>
customer.setAddress(address);address.setCustomer(customer);
 
 
databaseManager.createCustomer(customer);     <font color="darkgreen">//persist</font>
</code></pre><p><br/>This is implementation of method createCustomer.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font>
         entityManager.persist(customer);
<font color="navy">}</font>
 
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Unfortunately when i try to persist customer with address i get this exception:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">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(
     ...
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I thought that i would get the same id for Address as for Customer. But i got exeption and i don't know why.</p><p>Could you guys help me find out where is the reason of the exception and how to fix my code?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you in advance</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Hubert</p></div>
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