getHibernateTemplate().get(...) problem

[Thieumdesp]

Hello, i have a problem with the getHibernateTemplate().get(...) Method.

Here is my mapping :

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.auchan.protoFwk27.metier.fournisseur.internal.FournisseurImpl" table="P2_5_FOURNISSEUR">
		<id column="IFLS" name="ifls">
			<generator class="assigned"/>
		</id>
		<property column="LIBELLE" name="libelle" not-null="true"/>
	</class>
</hibernate-mapping>

My object FournisseurImpl implements an interface named Fournisseur so I can make HQL on the interface (see below the working code using Criteria)

Here is what i try to do :

Fournisseur fournisseur = (Fournisseur) getHibernateTemplate().get(Fournisseur.class, idFournisseur);

i throw me :

org.hibernate.MappingException: Unknown entity: com.auchan.protoFwk27.metier.fournisseur.Fournisseur

this code works :

//Use of Criteria
List myList = null;
DetachedCriteria detachedCriteria = DetachedCriteria.forClass(Fournisseur.class);
detachedCriteria.add(Restrictions.eq("ifls", idFournisseur));
myList = getHibernateTemplate().findByCriteria(detachedCriteria);
Fournisseur fournisseur = (Fournisseur) myList.get(0);

Other code working :

List lstFrn = getHibernateTemplate().loadAll(Fournisseur.class);

I don't understand why the getHibernateTemplate().get(...) does not work. May be it's normal ???

[Injecteer]

is the load() working?

[Thieumdesp]

No, the load does not work. I have exactly the same exception.

version information :
spring 2.0.2
hibernate : 3.0.2

[Injecteer]

what if you put

Fournisseur fournisseur = (Fournisseur) getHibernateTemplate().get(FournisseurImpl.class, idFournisseur);

[Thieumdesp]

Yes, it works. I tried it but forgot do talk about.

[karldmoore]

Do you need to specify the proxyInterface for the class? I've never tried this but the reference manual actually shows an example loading the Impl.
http://www.hibernate.org/hib_docs/v3...laration-class
http://www.hibernate.org/hib_docs/v3...tching-proxies

[Thieumdesp]

I try but it does not work

[karldmoore]

I'm not sure you can load it by the interface. If you have a look at the reference manual even that uses the Impl.

Cat cat = (Cat) session.load(CatImpl.class, catid);
Iterator iter = session.iterate("from CatImpl as cat where cat.name='fritz'");
Cat fritz = (Cat) iter.next();

http://www.hibernate.org/hib_docs/v3...tching-proxies

[Injecteer]

AFAIK, you must use the classes rather that interfaces in HQL-queries.
The interfaces (in mappings) can be used only as proxies to control lazy-loading strategy and they don't replace the need to specify classes.
I also don't really understand, why use interfaces in regard to POJOs... What implementation details can you hide behind an interface for a bean with no behaviour?

[karldmoore]

AFAIK, you must use the classes rather that interfaces in HQL-queries.
The interfaces (in mappings) can be used only as proxies to control lazy-loading strategy and they don't replace the need to specify classes.

Indeed. I've never actually tried this before, but I did last night and found the above to be true. The load(..), get(..), HQL, etc...... require the actual class name rather than the interface. I don't really think this is a major problem.