@Entity
       @NamedQueries( {
       @NamedQuery(name = "getAllMenus", query = "select m from Menu m"),
       @NamedQuery(name = "getMenusByPrevilegeId", query = "select m from Menu m
                JOIN m.menuPrevilege mp where mp.previlege_id = :p")})


    public class Menu implements Serializable {

    private String url;
    private String description;
    private List<MenuPrevilege> menuPrevilges;
    private static final long serialVersionUID = 1L;

    public Menu() {
        super();
    }

    @Id
    public String getUrl() {
        return this.url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public void setMenuPrevilges(List<MenuPrevilege> menuPrevilges) {
        if (menuPrevilges == null)
            menuPrevilges = new ArrayList<MenuPrevilege>();
        this.menuPrevilges = menuPrevilges;
    }

    @OneToMany(mappedBy = "menu", cascade = CascadeType.REMOVE)
    public List<MenuPrevilege> getMenuPrevilges() {
        if (menuPrevilges == null)
            menuPrevilges = new ArrayList<MenuPrevilege>();
        return menuPrevilges;
    }

    public Menu(String url, String description) {
        super();
        this.url = url;
        this.description = description;
    }
        }

    @Entity
        @Table(name = "Menu_Previlege")

        public class MenuPrevilege implements Serializable {

    private IdMenuPrevilege idmenuPrevilege = new IdMenuPrevilege);
    private Date activationDate;
    private Date deactivationDate;
    private Menu menu;
    private Previlege previlege;
    private static final long serialVersionUID = 1L;

    public MenuPrevilege() {
        super();
    }

    @EmbeddedId
    public IdMenuPrevilege getIdmenuPrevilege() {
        return this.idmenuPrevilege;
    }

    public void setIdmenuPrevilege(IdMenuPrevilege idmenuPrevilege) {
        this.idmenuPrevilege = idmenuPrevilege;
    }

    @Temporal(TemporalType.DATE)
    public Date getActivationDate() {
        return this.activationDate;
    }

    public void setActivationDate(Date activationDate) {
        this.activationDate = activationDate;
    }

    @Temporal(TemporalType.DATE)
    public Date getDeactivationDate() {
        return this.deactivationDate;
    }

    public void setDeactivationDate(Date deactivationDate) {
        this.deactivationDate = deactivationDate;
    }

    public void setMenu(Menu menu) {
        this.menu = menu;
    }

    @ManyToOne
    @JoinColumn(name = "menu_id", insertable = false, updatable = false)
    public Menu getMenu() {
        return menu;
    }

    public void setPrevilege(Previlege previlege) {
        this.previlege = previlege;
    }

    @ManyToOne
    @JoinColumn(name = "previlege_id", insertable = false, updatable = false)
    public Previlege getPrevilege() {
        return previlege;
    }

    public MenuPrevilege(Menu menu, Previlege previlege) {
        super();
        getIdmenuPrevilege().setIdMenu(menu.getUrl());
        getIdmenuPrevilege().setIdPrevilege(previlege.getPrevilegeId());
        this.setMenu(menu);
        this.setPrevilege(previlege);
        menu.getMenuPrevilges().add(this);
        previlege.getPrevilegeMenus().add(this);
    }

      }

    @NamedQuery(name = "getMenusByPrevilegeId", query = "select m from Menu m  JOIN
     m.previleges p where p.previlege.previlegeId = :p")})

    private List<MenuPrevilege> previleges;
    // getters and setters as well

    public MenuPrevilege(Menu menu, Previlege previlege) {
    super();
    getIdmenuPrevilege().setIdMenu(menu.getUrl());
    getIdmenuPrevilege().setIdPrevilege(previlege.getPrevilegeId());
    this.setMenu(menu);
    this.setPrevilege(previlege);
    menu.getPrevileges().add(this);
    previlege.getMenus().add(this);
    }