JPQL Problem!!

Question

Hi,
I'have a JPQL-JPA problem.
When I run a JPQL Query like:
"SELECT x FROM User x WHERE x.association.idAssociation = 1 OR x.customer.association.idAssociation = 1"
Then, My "JPA Toplink Essentials" library generates a SQL Query like this:
"SELECT t0.id_user, t0.descripcion, t0.last_access, t0.password, t0.estado, t0.surname, t0.username, t0.movil, t0.name, t0.telefono,
t0.email, t0.id_customer, t0.id_society, t0.id_association, t0.id_language, t0.id_shop, t0.id_group
FROM customers t3, associations t2,associations t1, users t0
WHERE (((t1.id_association = ?) OR (t2.id_association= ?))
AND (((t1.id_association = t0.id_association) AND (t3.id_customer = t0.id_customer))
AND (t2.id_association = t3.id_association)))
There's a problem....near FROM clausule....table "associations" is repeated 2 times. Whhy?
These are my entities;
@Entity
@Table(name = "users")
public class User implements Serializable
     @Id
     @GeneratedValue(strategy=GenerationType.SEQUENCE)
     @Column(name = "id_user")
     private int id_user;
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "id_association")
     private Association association;
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "id_customer")
     private Customer customer;
@Entity
@Table(name = "associations")
public class Association implements Serializable
     @Id
     @GeneratedValue(strategy=GenerationType.SEQUENCE)
     @Column(name="id_association")
     private short idAssociation;
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "association", cascade = CascadeType.ALL)
     @JoinColumn(name = "id_association")
     private List<User> users;
@Entity
@Table(name = "customers")
public class Customer implements Serializable
     @Id
     @GeneratedValue(strategy=GenerationType.SEQUENCE)
     @Column(name="id_customer")
     private int idCustomer;
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer", cascade = CascadeType.ALL)
     @JoinColumn(name = "id_customer")
     private List<User> users;
Thanks in advance,

Answer 1

I tried in one of my Employee examples using both:
SELECT e FROM Employee e WHERE e.address.city = 'Ottawa' OR e.address.city = 'Toronto'
and
SELECT e FROM Employee e JOIN e.address a WHERE a.city = 'Ottawa' OR a.city = 'Toronto'
In EclipseLink 1.0 both of these result in the same SQL. This may have been fixed in later versions of TopLink Essentials. Does the second approach of using the single JOIN fix your issue?
Doug