找不到NamedQuery

Question

我尝试从实体Item执行namedQuery，但是会导致错误，指出无法找到namedQuery。

我也试图获得另一个名字查询，但也找不到它们。

具有命名查询的实体。

    @Entity
    @NamedQueries({
        @NamedQuery(name = "Item.getAll", query = "select a from Item as a"),
        @NamedQuery(name = "Item.count", query = "select count(a) from Item as a"),
        @NamedQuery(name = "Item.findByDescription", query = "select a from Item as a where a.description = :descriptions")
    })
    public class Item implements Comparable, Serializable {

        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;

        @OneToOne
        @JoinColumn(name="email")
        private User seller;

        private Category category;
        private String description;

        @OneToOne
        private Bid highest;

        public Item(User seller, Category category, String description) {
            this.seller = seller;
            this.category = category;
            this.description = description;
        }

        public Item() {

        }

(Getters and setters)

我试图从Item中找到namedQuery。

EntityManagerFactory emf = Persistence.createEntityManagerFactory("auctionPU");    

public List<Item> findByDescription(String description) {
        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        try {
            Query q = em.createNamedQuery("Item.findByDescription", Item.class);
             q.setParameter("descriptions", description);
             List<Item> a = q.getResultList();
            em.close();
            return a;
        }
        catch (NoResultException e) {
            return null;
        }
        finally {
            em.close();
        }
    }

Answer 1

配置不正确时会显示此错误。您使用的是弹簧启动还是弹簧？ 您似乎没有扫描您命名查询所在的软件包，扫描

<property name="packagesToScan" value="your_base_package_of_model_pojo.**"/>

OR

在春季启动

中

添加

@EntityScan("your_base_package_of_model_pojo")

到您的配置类