@Entity
@Indexed
@Table(name = "iapol.rrhh_solicitud_licencia")
@SequenceGenerator(name = "seq_rrhh_solicitud_licencia", sequenceName = "iapol.seq_rrhh_solicitud_licencia")
public class SolicitudLicenciaEnt implements Serializable, SolicitudLicencia {

   private static final long serialVersionUID = -2831177010189116163L;

   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seq_rrhh_solicitud_licencia")
   @Column(name = "id", nullable = false)
   private Long id;

@IndexedEmbedded
   @ManyToOne(fetch = FetchType.LAZY)
   @JoinColumn(name = "id_usuario", nullable = false)
   public AgenteEnt agente;

.......
getters and setters
.......
}

@Entity
@Table(name = "iapol.per_agentes")
@Inheritance(strategy = InheritanceType.JOINED)
public class AgenteEnt extends UsuarioEnt implements Agente, Serializable {
......
......
......
}

@Entity
@Table(name = "iapol.per_usuario")
@Inheritance(strategy = InheritanceType.JOINED)
@SequenceGenerator(name = "per_sq_usuario", sequenceName = "iapol.per_sq_usuario")
public class UsuarioEnt implements Usuario, Serializable {

   private static final long serialVersionUID = 3570278684052360798L;

   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "per_sq_usuario")
@Column(name = "id", nullable = false)
   protected Long id;

@Field(index = Index.TOKENIZED, store = Store.NO)
   @FieldBridge(impl = StringTildesBridge.class)
        @Column(name = "username", nullable = false, unique = true)
   protected String username;

..........
............
.................