what´s wrong with this? @Entity @Table(name="ruta") public class Ruta{ ..... @OneToMany(mappedBy="ruta", cascade=CascadeType.REMOVE) public List getPuertos() { return rutapuertos; } ..... ------------------ @Entity @Table(name="puerto") public class Puerto { ... @OneToMany(mappedBy="puerto",cascade=CascadeType.REMOVE) public List getRutaPuertos() { return rutaPuertos; } ... --------------------- @Entity @Table(name="rutapuerto") @IdClass(RutaPuertoPK.class) public class RutaPuerto{ @Id @Column(name="idPuerto",nullable=false,insertable=false, updatable=false) public Long getIdPuerto() { return idPuerto; } //setter @Id @Column(name="idRuta",nullable=false,insertable=false, updatable=false) public Long getIdRuta() { return idRuta; } //setter @Column(name="kilometros") public Double getKilometros() { return kilometros; } public void setKilometros(Double kilometros) { this.kilometros = kilometros; } @ManyToOne(optional=false) @JoinColumn(name="idPuerto") public Puerto getPuerto() { return puerto; } public void setPuerto(Puerto puerto) { this.puerto = puerto; } @ManyToOne(optional=false) @JoinColumn(name="idRuta") public Ruta getRuta() { return ruta; } .............. } Jboss tells me next error: ....................... ....................... Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: es.rutamanager.modelo.rutapuerto.entidad.RutaPuerto column: idPuerto (should be mapped with insert="false" update="false") thanks! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042891#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...