Help with exception in hibernate

Question

i have this POJO mapped to my MySQL database:

@Entity
@Table(name = "participantespresentes", catalog = "tagit")
public class Participantespresentes implements java.io.Serializable {

    private ParticipantespresentesId id;
    private Evento evento;
    private Usuario usuario;
    private boolean status;

    public Participantespresentes() {
    }

    public Participantespresentes(ParticipantespresentesId id, Evento evento, Usuario usuario, boolean status) {
        this.id = id;
        this.evento = evento;
        this.usuario = usuario;
        this.status = status;
    }

    @EmbeddedId
    @AttributeOverrides({
        @AttributeOverride(name = "idUsuario", column =
        @Column(name = "idUsuario", nullable = false)),
        @AttributeOverride(name = "idEvento", column =
        @Column(name = "idEvento", nullable = false))})
    public ParticipantespresentesId getId() {
        return this.id;
    }

    public void setId(ParticipantespresentesId id) {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "idEvento", nullable = false, insertable = false, updatable = false)
    public Evento getEvento() {
        return this.evento;
    }

    public void setEvento(Evento evento) {
        this.evento = evento;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "idUsuario", nullable = false, insertable = false, updatable = false)
    public Usuario getUsuario() {
        return this.usuario;
    }

    public void setUsuario(Usuario usuario) {
        this.usuario = usuario;
    }

    @Column(name = "status", nullable = false)
    public boolean isStatus() {
        return this.status;
    }

    public void setStatus(boolean status) {
        this.status = status;
    }
}

And everytime that i try to execute any operation with hibernate, launch this exception:

Initial SessionFactory creation failed.org.hibernate.AnnotationException: Collection has neither generic type or OneToMany.targetEntity() defined: com.bytecode.entities.Evento.participantespresentes

Any help ?

Best regards, Valter Henrique.

Answer 1

The problem is not in Participantespresentes, but in the class Evento. You have there an attribute called participantespresentes, but it's not mapped properly. If don't find the problem, please post the code of Evento.

Answer 2

Exception message is pretty clear - Hibernate cannot determine element type of collection Evento.participantespresentes. You need to declare it as generic (i.e. as List<Participantespresentes>).