@Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Size(max = 45)
    @Column(name = "fullname")
    private String fullname;
    // @Pattern(regexp="^\\(?(\\d{3})\\)?[- ]?(\\d{3})[- ]?(\\d{4})$", message="Недопустимый формат номера телефона/факса (должен иметь формат xxx-xxx-xxxx)")//if the field contains phone or fax number consider using this annotation to enforce field validation
    @Size(max = 45)
    @Column(name = "phone")
    private String phone;
    @JoinColumn(name = "stitle", referencedColumnName = "idtitle")
    @ManyToOne
    private Post stitle;
-------------------
    public Staff(Integer id, String fullname, String phone, Post stitle) {
        this.id = id;
        this.fullname = fullname;
        this.phone = phone;
        this.stitle = stitle;
    }
    

  private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "idtitle")
    private Integer idtitle;
    @Size(max = 45)
    @Column(name = "title")
    private String title;
    @OneToMany(mappedBy = "stitle")
    private Collection<Staff> staffCollection;

Staff staff = new Staff(id,fullname,phone,stitle); 

 <c:forEach items="${allStaff}" var="sta">
                    <tr>
                        <td>${sta.id}</td>
                        <td>${sta.fullname}</td>
                        <td>${sta.phone}</td>
                        <td>${sta.stitle}</td>
  </c:forEach>

   @Override
    public String toString() {
        return title;
    }

 public List<Staff> getAllStaff() {
        return em.createNamedQuery("Staff.findAll").getResultList();
    }

 public List<Staff> getAllStaffById(int id) {
        return em.createNamedQuery("SELECT s from Staff WHERE s.id="+id).getResultList();
    }