java.lang.IllegalArgumentException：找不到命名查询：

@Stateless
public class BondecomandeDAO {

    @PersistenceContext
    private EntityManager em;

    public Bondecommande findBCbyid(int id)
    {
         Query q =em.createNamedQuery("select bc from Bondecommande bc where bc.idbc = :idbc");
         q.setParameter("idbc",id);
         return  (Bondecommande) q.getResultList().get(0);
     }
}

和

@Entity
@Table(name="bondecommande")
public class Bondecommande  implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="idbc")
    private int idbc;
    @Column(name="devise")
    private String devise;
    @Column(name="modepaiement")
    private String modepaiement;
    @Column(name="modelivraison")
    private String modelivraison;
    @Column(name="delaipaiement")
    private int delaipaiement;

      ////other attributes,getters and setters 
}

当我尝试运行函数findBCbyid(int id)时,我收到此错误

java.lang.IllegalArgumentException: Named query not found: select bc from Bondecommande bc where bc.idbc = :idbc

虽然我在另一个项目中使用了这个命名查询,但它有效,但这里可能出现什么问题？