JPA/Hibernate OneToMany & ManyToOne annotations - jpa

Question

I'm writing code that looks like Google Latitude (locate a user).
I'm under tomcat 6.0.33, using jpa/hibernate, and easybeans 1.1
They work independently, but when I try to link them it fails:
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: entity] Unable to build EntityManagerFactory
Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
Here is the code:
public class Personne{
#ManyToOne(fetch=FetchType.EAGER, cascade={ CascadeType.PERSIST,CascadeType.MERGE })
public Personne getOwner() {
return owner;
}
}
public class MaPosition{
#OneToMany
public List<Personne> getFriends() {
return friends;
}
}
Thanks for your help ;)

Answer 1

does it work if you add a mappedBy to your OneToMany?
public class MaPosition{
#OneToMany(mappedBy="owner")
public List<Personne> getFriends() {
return friends;
}
}

Answer 2

JPA/Hibernate OneToMany & ManyToOne annotations for class person and person address.
So one person can have many addresses..... and I used this It worked...
One to many....
public class Person{
#OneToMany(mappedBy="person", targetEntity=Address.class, cascade=CascadeType.MERGE)
private Set<Address> addressList = HashSet<Address>();
//Getters and Setters.....
}
Many to one....
public class Address{
#ManyToOne
#JoinColumn(name="PERSON_ID")
private Person person;
//Getters and Setters.....
}