[appengine-java] JPA - Problem when I will insert a parent with a child already inserted.

[vaninh0]

I have these Entities:

@Entity(name = "Empresa")
@Table(name = "empresa")
public class Empresa {
        @Id
        @Column(name = "id_empresa")
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
}

and

@Entity(name = "Usuario")
@Table(name = "usuario")
public class Usuario {
        @Id
        @Column(name = "id_usuario")
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "id_empresa")
}

I have inserted many of Empresas and now I wanna insert a new Usuario
with a inserted Empresa, but I got this exception:

javax.persistence.PersistenceException: Error in meta-data for
br.com.controlecartao.core.entity.Empresa.id: Cannot have a
java.lang.Long primary key and be a child object (owning field is
br.com.controlecartao.core.entity.Usuario.empresa).

I´m using the method MERGE, but I don´t know if this method is correct
to to this.

What´s the correct way to do this?
Where am I wrong?

Thank you.

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