Hibernate :many to many doesn't work - spring

Question

I'm working on a many to many relationship with hibernate
here are my tables in the data-base :
table : Service
table : Pays
and the join table : service-pays
I have 2 entities : Service and Pays
here is my code:
public class Service implements java.io.Serializable {
private Integer idService;
private String nomService;
private Set<Pays> payses = new HashSet<Pays>();
// getters & setters
....
}
public class Pays implements java.io.Serializable {
private Integer idPays;
private String nomPays;
private Set<Service> services = new HashSet<Service>(0);
// getters & setters
....
}
the mapping fils are:
<hibernate-mapping package="pckg">
<class name="pckg.Service" dynamic-update="true" select-before-update="true" table="service" catalog="database" lazy="false" >
<id name="idService" type="java.lang.Integer">
<column name="id_service" />
<generator class="identity" />
</id>
<property name="nomService" />
<set name="countries" table="service_pays" lazy="true"
inverse="true" cascade="save-update">
<key column="id_service" />
<many-to-many column="id_pays" class="pckg.Pays" />
</set>
</class>
</hibernate-mapping>
<hibernate-mapping package="pckg">
<class name="pckg.Pays" dynamic-update="true" select-before-update="true" table="service" catalog="database" lazy="false" >
<id name="idPays" type="java.lang.Integer">
<column name="id_pays" />
<generator class="identity" />
</id>
<property name="nomPays" />
<set name="ser" table="service_pays" lazy="true"
cascade="save-update" >
<key column="id_pays" />
<many-to-many column="id_service" class="pckg.Service" />
</set>
</class>
</hibernate-mapping>
my methode to save the service:
Pays p1= new Pays("France");
Pays p2=new Pays("Italy");
Set<Pays> list-pays=new HashSet<Pays>();
list-pays.add(p1);
list-pays.add(p2);
Service service=new Service();
service.setNomService("nomService");
service.setCountries(list-pays);
serviceBo.saveService(service);
Here is serviceBo.saveService:
public class ServiceBoImp implements ServiceBo ,Serializable{
ServiceDao serviceDao;
//getter & setter of serviceDao
#Override
public void saveService(Service sited) {
serviceDao.saveService(sited);
}
}
and here is ServiceDao
public class ServiceDaoImp extends HibernateDaoSupport implements ServiceDao ,Serializable {
#Override
public void saveService(ServiceDsite s) {
getHibernateTemplate().setCheckWriteOperations(false);
getHibernateTemplate().save(s);
}
}
the problem is that when i save a service with its Set ,the service is saved correctly but without Pays which means the join table is always empty

Answer 1

I think the problem is that service.getPays() is marked with inverse="true". This means that Hibernate should ignore this side of the relation and track only the other.
Try to move the inverse=true to the other side of the relation, and then the cascade save should work.