Problème avec le selectOneMenu

salut
j'ai deux tables direction 1 ---- 1* département je voulais ajouter un département qui contient une clé étrangère de la table direction DirectionID qui sera sous form de selectOneMenu voici le mon bean

Code:

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package managedbean;
 
 
 
 
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
 
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.model.SelectItem;
 
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
 
 
import metier.DepartementManagerImpl;
import metier.DirectionManagerImpl;
import metier.IDirectionManager;
 
import metier.IDepartementManager;
 
import dao.DirectionDAOImpl;
import dao.IDirectionDAO;
import departement.Departement;
import direction.Direction;
 
@ManagedBean(name="dept")
@SessionScoped
 
public class DepartementBean {
 
    IDepartementManager d=new DepartementManagerImpl();
    IDirectionManager dir = new DirectionManagerImpl();
    IDirectionDAO m=new DirectionDAOImpl();
 
    private Departement departement=new Departement();
 
    private Collection<SelectItem> directions=new ArrayList<SelectItem>();
 
    long directionidD;
    private long departementid;
    private String nomDept;
    private String chefDept;
    private Direction directionid;
 
 
 
    public long getDepartementid() {
        return departementid;
    }
 
    public void setDepartementid(long departementid) {
        this.departementid = departementid;
    }
 
    public String getNomDept() {
        return nomDept;
    }
 
    public void setNomDept(String nomDept) {
        this.nomDept = nomDept;
    }
 
    public String getChefDept() {
        return chefDept;
    }
 
    public void setChefDept(String chefDept) {
        this.chefDept = chefDept;
    }
 
    public Direction getDirectionid() {
        return directionid;
    }
 
    public void setDirectionid(Direction directionid) {
        this.directionid = directionid;
    }
 
 
 
    public DepartementBean(){
 
 
 
    }
 
 
 
    public long getDirectionidD() {
        return directionidD;
    }
 
 
 
    public void setDirectionidD(long directionidD) {
        this.directionidD = directionidD;
    }
 
 
 
    public Departement getDepartement() {
        return departement;
    }
 
    public void setDepartement(Departement departement) {
        this.departement = departement;
    }
 
    public DepartementBean(Departement departement) {
        super();
        this.departement = departement;
    }
 
 
 
public Collection<SelectItem> getDirections() {
 
    IDirectionManager dir = new DirectionManagerImpl();
    ArrayList<Direction> l=new ArrayList<Direction>();
    l.addAll(dir.ListeDirection("select d from Direction d "));
    for(int i=0;i<l.size();i++)
    {
        directions.add(new SelectItem(l.get(i).getDirectionid(),l.get(i).getNomDirection()));
 
    }
 
        return directions;
    }
 
    public void setDirections(Collection<SelectItem> directions) {
        this.directions = directions;
    }
 
 
blic String ajouterNewDepartement(){
 
        String forward="ok";
 
        Departement dept1=new Departement();
        dept1.setDepartementid(this.getDepartementid());
        dept1.setNomDept(this.getNomDept());
        dept1.setChefDept(this.getChefDept());
 
        Direction dd= rechercherDirection(this.getDirectionidD());
        dept1.setDirectionid(dd);
 
        d.ajoutDepartement(dept1);
 
 
        return "forward";
 
    }

Voici la vue

Code:

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            Nom departement : <h:inputText
                        value="#{departementBean.departement.nomDept}"></h:inputText>
                    <br></br>
             chef departement: <h:inputText
                        value="#{departementBean.departement.chefDept}"></h:inputText>
                    <br></br>
 
            Direction: <h:selectOneMenu value="#{departementBean.directionid} ">
                    <f:selectItems  value="#{departementBean.directions}" />
                </h:selectOneMenu>
 
 
                </h:panelGrid>
                <br />
 
                <h:commandButton value="Save new Departement"
                    action="#{departementBean.ajouterNewDepartement}"
                    style="width: 156px" />

voici l'erreur :

Code:

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javax.servlet.ServletException: javax.el.PropertyNotWritableException: /GereDepartement.xhtml @28,72 value="#{departementBean.directionid} ": Illegal Syntax for Set Operation
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)