hello,

I am starting with hibernate. Here is the error I got when launching client. Is anyone could tell me what's happening!

Hibernate version:2.1

Mapping documents:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="com.champion.hibernate.POJOPersonnes" table="personnes" schema="public">
<id name="idPersonne" column="id_personne" type="long">
<generator class="native"/>
</id>
<property name="nom" column="nom" type="string" length="50"/>
<property name="prenom" column="prenom" type="string" length="30"/>
<property name="dateNaissance" column="date_naissance" type="date" length="4"/>
<property name="sexe" column="sexe" type="string" length="1"/>
</class>
</hibernate-mapping>


Code between sessionFactory.openSession() and session.close():

Configuration cfg=new net.sf.hibernate.cfg.Configuration()
.addClass(POJOPersonnes.class);
SessionFactory ssFactory=cfg.buildSessionFactory();
//ouverture de la session
ss=ssFactory.openSession();

//cr

check, the sequence generator parameters

are you taking about the <generator class="native"> in the mapping file?

Kind of, native means native to the DB. In postgres, this is equivalent to sequence.
Set the correcpt parameters as explained in
http://www.hibernate.org/hib_docs/reference/en/html_single/#mapping-declaration-id-sequences