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Cannot get the inheritance-mapping to work (10.1.3 from doc)

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frodeh

Post subject: Cannot get the inheritance-mapping to work (10.1.3 from doc)

Posted: Mon Jul 11, 2005 7:12 pm

Beginner

Joined: Wed Jan 19, 2005 6:07 am
Posts: 20

Hibernate V3.

I follow the sample in section 10.1.3 Table per subclass, using discriminatro, But can't get it to work properly.

When I copy the sample (omitting the key-attribute for the join) the parser complains that the key-attribute is missing.

When including the key this error occurs :

Quote:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/appContext.xml]: Initialization of bean failed; nested exception is java.util.NoSuchElementException: null
java.util.NoSuchElementException
at java.util.AbstractList$Itr.next(AbstractList.java:426)
at org.hibernate.sql.InFragment.toFragmentString(InFragment.java:80)

When also including the mapping to the parent-table like this :

Code:

    <class name="no.song.b2b.clients.OrderProcessDAO" table="ordre_prosess">
        <id name="processId" column="prosess_id">
            <generator class="native" />
        </id>
        <discriminator column="prosess_type" type="string"/>
        <subclass name="no.song.b2b.clients.jara.JaraOrderProcessDAO" discriminator-value="Jara">
            <join table="ordre_prosess_jara">
                
                <key column="prosess_id"/>
                <many-to-one name="processId" column="prosess_id" class="no.song.b2b.clients.OrderProcessDAO"/>
            </join>
        </subclass>

    </class>

the error is like this :

Quote:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/appContext.xml]: Initialization of bean failed; nested exception is org.hibernate.MappingException: Repeated column in mapping for entity: no.song.b2b.clients.jara.JaraOrderProcessDAO column: prosess_id (should be mapped with insert="false" update="false")
org.hibernate.MappingException: Repeated column in mapping for entity: no.song.b2b.clients.jara.JaraOrderProcessDAO column: prosess_id (should be mapped with insert="false" update="false")
at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:504)
at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:526)

Does anyone have the correct syntax for this mapping-scenario ?

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frodeh

Post subject: Figured this one out....

Posted: Tue Jul 12, 2005 6:45 am

Beginner

Joined: Wed Jan 19, 2005 6:07 am
Posts: 20

The problem was that I tried tu use another interface instead of an concrete class as my subclass-definition.

But when I did I got a new error...

The mapping :

Code:

    <class name="no.song.b2b.clients.OrderProcessDAO" table="ordre_prosess">
        <id name="processId" column="prosess_id" unsaved-value="-1">
            <generator class="increment" />
        </id>
        <discriminator column="prosess_type" type="string"/>
        
        <subclass name="no.song.b2b.clients.jara.JaraOrderProcessImpl" discriminator-value="Jara" >
             <join table="ordre_prosess_jara">
                 <key column="prosess_id"/>
                 <many-to-one name="processId" column="prosess_id" class="no.song.b2b.clients.OrderProcessDAO" update="false" insert="false" />
             </join>

         </subclass>
        
      </class>

The code :

Code:

        OrderProcess prosess = new JaraOrderProcessImpl();
        dao.saveOrUpdate(prosess);

The error :

Quote:

org.springframework.orm.hibernate3.HibernateSystemException: instance not of expected entity type: no.song.b2b.clients.OrderProcessDAO; nested exception is org.hibernate.HibernateException: instance not of expected entity type: no.song.b2b.clients.OrderProcessDAO
org.hibernate.HibernateException: instance not of expected entity type: no.song.b2b.clients.OrderProcessDAO
at org.hibernate.persister.entity.BasicEntityPersister.getSubclassEntityPersister(BasicEntityPersister.java:2986)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1089)

The class-structure is like this:

Two 'master interfaces' OrderProcess and OrderProcessDAO, two interfaces extending those : JaraOrderProcess and JaraOrderProcessDAO,
and the class implementing the two latter : JaraOrderProcessImpl.

The concrete class does only implement the master-DAO-interface via inheritance, but shouldn't this be allowed ??

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