jpql加入查询

   @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);
}

  }