Mapping exception when one class maps to multiple tables.

[enversuser]

Hi Everyone,

I have successfully added envers to my spring hibernate configuration, its working fine for simple features. Im exploring with different scenarios
For example , Address entity object maps to multiple tables (as shown in the configuration), and has the many to one relation with person entity, when Im trying to save the person entity, getting below error message.

org.hibernate.MappingException: Unknown entity: envers.domainobjects.Address
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:628)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1366)
at org.hibernate.envers.tools.Tools.getIdentifier(Tools.java:67)
at org.hibernate.envers.tools.Tools.entitiesEqual(Tools.java:50)
at org.hibernate.envers.entities.mapper.relation.ToOneIdMapper.mapToMapFromEntity(ToOneIdMapper.java:65)
at org.hibernate.envers.entities.mapper.MultiPropertyMapper.map(MultiPropertyMapper.java:86)
at org.hibernate.envers.synchronization.work.AddWorkUnit.perform(AddWorkUnit.java:60)
at org.hibernate.envers.synchronization.AuditSync.executeInSession(AuditSync.java:125)
at org.hibernate.envers.synchronization.AuditSync.beforeCompletion(AuditSync.java:164)
at org.hibernate.transaction.JDBCTransaction.notifyLocalSynchsBeforeTransactionCompletion(JDBCTransaction.java:274)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:140)
at envers.test.TestAuditLogs.createPersonAndAddress(TestAuditLogs.java:179)
at envers.test.TestAuditLogs.main(TestAuditLogs.java:80)

address.hbm.xml file :
----------------------
<class name="envers.domainobjects.Address" table="POSTAL_ADDRESS" entity-name="postalAddress">
 <id name="id" column="ID" type="long">
 <generator class="increment" />
 </id>
 <property name="streetName" type="string">
 <column name="streetName" />
 </property>
 <property name="houseNumber" type="int">
 <column name="houseNumber" />
 </property>
 <property name="flatNumber" type="int">
 <column name="flatNumber" />
 </property>
</class>
<class name="envers.domainobjects.Address" table="BILLING_ADDRESS"
 entity-name="billingAddress">
 <id name="id" column="ID" type="long">
 <generator class="increment" />
 </id>
 <property name="streetName" type="string">
 <column name="streetName" />
 </property>
 <property name="houseNumber" type="int">
 <column name="houseNumber" />
 </property>
 <property name="flatNumber" type="int">
 <column name="flatNumber" />
 </property>
 </class>


Person.hbm.xml file:
---------------------

<class name="envers.domainobjects.Person" table="PERSON">
 <id name="id" column="ID" type="long">
 <generator class="increment" />
 </id>
 <property name="name" type="string">
 <column name="NAME" />
 </property>
 <property name="surname" type="string">
 <column name="surname" />
 </property>
 <many-to-one name="postalAddress" class="envers.domainobjects.Address"
 entity-name="postalAddress" column="postal_address_Id" unique="true" />
 <many-to-one name="billingAddress" class="envers.domainobjects.Address"
 entity-name="billingAddress" column="billing_address_Id" unique="true" />
</class>

Any help would be appreciated.


Thanks
skhan.

[enversuser]

It seems that the problem is in the enver's 'ToOneIdMapper' class,where the 'mapToMapFromEntity()' method which finds out the entities equals is not using the referencedEntityName, in down the line supposed to be used to find out the entity persister object.Please look into the below code which will try to get the identifier from the entity persister which is causing the problem.

Tools.java
----------

 public static Object getIdentifier(SessionImplementor session, Object obj) {
 if (obj == null) {
 return null;
 }

 if (obj instanceof HibernateProxy) {
 HibernateProxy hibernateProxy = (HibernateProxy) obj;
 return hibernateProxy.getHibernateLazyInitializer().getIdentifier();
 }


 return session.getEntityPersister(null, obj).getIdentifier(obj, session.getEntityMode());
 }

(Using the hibernate-envers-3.5.0-Beta-2 and hibernate-core-3.3.2.GA)

[adamw]

Hmm, interesting mapping :). This may cause some problems, I never tested it. And you also probably found the cause :). If you'd have a fix, that would be great ;). Anyway, please report that in JIRA.

Adam

[enversuser]

Thanks for your quick reply. I have created the Jira task.

http://opensource.atlassian.com/projects/hibernate/browse/HHH-4648.