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BenjaminJ
 Post subject: TABLE_PER_CLASS and h2database
PostPosted: Tue Jun 17, 2008 2:13 pm 
Newbie

Joined: Tue Jun 17, 2008 1:44 pm
Posts: 3
Hi,

I have some trouble with hsqldb and TABLE_PER_CLASS.

I'm running Hibernate 3.3.0ga.

The chunck of code that is used :

Code:
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class A {
    protected Long id;
   
    @Id
    @GeneratedValue(generator = "SEQ_A")
    @SequenceGenerator(name="SEQ_A", sequenceName = "SEQ_A")
    public Long getId(){
        return id;
    }


This mapping works just fine with ORACLE 10g.
But when I run it with H2database 1.0.73, it fails with the following error :

Code:
org.hibernate.MappingException: Cannot use identity column key generation with <union-subclass> mapping for: my.package.A
   at org.hibernate.persister.entity.UnionSubclassEntityPersister.<init>(UnionSubclassEntityPersister.java:67)
   at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:61)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
   at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)
   at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1201)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1171)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:425)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:261)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:109)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1099)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:861)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:421)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:261)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:109)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1099)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:861)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:421)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:91)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:75)


Could someone explains me why it works on Oracle and not on h2database ? Is that a sequence support problem ?

Thanks a lot
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Cameron McKenzie
 Post subject:
PostPosted: Tue Jun 17, 2008 3:17 pm 
Expert
Expert

Joined: Tue May 13, 2008 3:42 pm
Posts: 919
Location: Toronto & Ajax Ontario www.hibernatemadeeasy.com
Image

Total shot in the dark, but someone got one of my inheritance examples from my Hibernate book, that worked swell with MySQL, by using the following hibernate annotation:

@org.hibernate.annotations.GenericGenerator(name = "hibernate-uuid",
strategy = "uuid")


Code:

public Class Ancestor
{
   @Id
   @org.hibernate.annotations.GenericGenerator(name = "hibernate-uuid",
       strategy = "uuid")

   @Column(name = "ancestor_id")
   private Long    id;

   ....

}




http://jpa.thebookonhibernate.com/Javacode/learn.jsp?tutorial=16mappinginheritancewithjpa


I believe this was the original mapping that did work with my Ancesctor - Parent - Child code:

Code:
@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class Ancestor {    }



Image


Image

_________________
Cameron McKenzie - Author of "Hibernate Made Easy" and "What is WebSphere?"
http://www.TheBookOnHibernate.com Check out my 'easy to follow' Hibernate & JPA Tutorials

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BenjaminJ
 Post subject:
PostPosted: Wed Jun 18, 2008 5:42 am 
Newbie

Joined: Tue Jun 17, 2008 1:44 pm
Posts: 3
Thanks for your help, uuid strategy is working very well.
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Cameron McKenzie
 Post subject:
PostPosted: Thu Jun 19, 2008 9:36 am 
Expert
Expert

Joined: Tue May 13, 2008 3:42 pm
Posts: 919
Location: Toronto & Ajax Ontario www.hibernatemadeeasy.com
I actually ran into the same problem when doing my book on Hibernate. :( Took some help from a friend to figure it out.

_________________
Cameron McKenzie - Author of "Hibernate Made Easy" and "What is WebSphere?"
http://www.TheBookOnHibernate.com Check out my 'easy to follow' Hibernate & JPA Tutorials

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bcollins
 Post subject:
PostPosted: Wed Jan 14, 2009 3:58 pm 
Newbie

Joined: Mon Dec 17, 2007 6:41 pm
Posts: 4
Hi, Does anyone know if this approach will work with MS SQL Server 2005 and/or 2008? If not, is there another way to get TABLE_PER_CLASS with unions to work with MS SQL Server?

Thanks,
Brendan
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