Hi everybody, I would get an Output of an Table Road (Oracle Database) via EntityManager and Web Services. I got the following error : org.hibernate.type.SerializationException: could not deserialize Eclipe3.4.1/Glassfish V2.1/SoapUI 2.5 (for testing) Enviroment: Class : Location IATA (PK) Class : Road Origin (PK)(FK of IATA) Destination (PK)(FK of IATA) To manage the composite ID I generated a class RoadPK which is below: import java.io.Serializable; | import javax.persistence.Embeddable; | @Embeddable | public class RoadPK implements Serializable { | | /** | * Variable of type Location | */ | private Location origin = null; | | private Location destination = null; | ......(Getter/Setter)..... | Class Road have the attributs(the composite ID). I locate the Problem here in the @nameQuery. I can show all availability methods when I write SELECT r.availabilityMethod FROM ROADS r. But I can't access origin and destination by SELECT r.origin.iata FROM ROADS r . So my Question is: Is my mapping wrong or is there no posssibility to work with Type classes for attributes in composite IDs in EJB3? @Entity | @NamedQuery( | name = "ROADS.listAll", | query = "SELECT r FROM ROADS r")/* | | @Table(name="ROADS") | public class ROADS implements Serializable { | | private RoadPK roadPK = null; | private String availabilityMethod = null; | | @EmbeddedId | public RoadPK getRoadPK() { | return roadPK ; | } | | public void setRoadPK(RoadPK roadPK ) { | this.roadPK = roadPK ; | } | @Column(name="AVAILABILITY_METHOD") | public String getAvailabilityMethod() { | return availabilityMethod; | } | | | public void setAvailabilityMethod(final String availabilityMethodParam) { | this.availabilityMethod = availabilityMethodParam; | } | | | } Class Location: @Entity | @Table(name = "LOCATIONS") | public class Location implements Serializable { | | private String iata = null; | | /** | * The Roads | */ | private Set<Road> roadsorigin; | | private Set<Road> roadsdestination; | | @Id | @Column(name = "IATA") | public String getIata() { | return iata; | } | //................... | @OneToMany(mappedBy = "roadPK.origin", fetch = FetchType.EAGER, cascade = CascadeType.ALL) | public Set<Road> getRoadsorigin() { | return roadsorigin; | } | | public void setRoadsorigin(Set<ROAD> roadsorigin) { | this.roadsorigin= roadsorigin; | } | | @OneToMany(mappedBy = "roadPK.destination", fetch = FetchType.EAGER, cascade = CascadeType.ALL) | public Set<Road> getRoadsdestination() { | return roadsdestination; | } | | public void setRoadsdestination(Set<Road> roadsdestination) { | this.roadsdestination = roadsdestination; | } | } The class RoadDAO offers the WebServices: @WebService | @Stateless(name="RoadDAO") | public class RoadDAOimplements Serializable { | | @PersistenceContext(name="ResourceDS") | private EntityManager em; | // .... | @SuppressWarnings("unchecked") | @WebMethod | @WebResult(name="RoadsList") | public final List < Road> listRoad() { | return em.createNamedQuery("Road.listAll").getResultList(); | } | // .... | } Thanks for reading View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4227131#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...