Question

这是代码

@SequenceGenerator(name = "honey_seq", sequenceName = "honey_id_seq")
public class Honey implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "honey_seq")
    private Integer id;
    private String name;
    private String taste;
    @OneToMany(mappedBy = "honey")
    private Set<Bee> bees = new HashSet<>();



@Entity
public class Bee implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "bee_gen")
    @SequenceGenerator(name = "bee_gen", sequenceName = "bee_id_seq")
    private Integer id;
    private String name;

    @ManyToOne
    @JoinColumn
    private Honey honey;

    public Bee() {
    }

配置

<hibernate-configuration>
    <session-factory>
        <property name="connection.url">jdbc:mysql://localhost:3306/sweet</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="current_session_context_class">thread</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">create</property>


        <!-- Mappings -->

        <mapping class="com.hibernate.domain.Honey" />
        <mapping class="com.hibernate.domain.Bee" />
    </session-factory>

Client.java

public static Honey createHoney() {
        Honey forestHoney = new Honey();
        forestHoney.setName("forest Honey");
        forestHoney.setTaste("very sweet");
        Session sessoin = (Session) InitSessionFactory.getSessionFactoryInstance();
        Transaction transaction = sessoin.beginTransaction();
        sessoin.save(forestHoney);
        transaction.commit();
        sessoin.close();
        return forestHoney;
    }

堆栈跟踪

Exception in thread "main" org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.hibernate.domain.Bee.honey references an unknown entity: com.hibernate.domain.Honey
    at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:97)

不知道为什么我收到此错误，我是hibernate的新手，这是我第一个使用hibernate的程序。

搜索各种表单后，我无法解决该错误。

我不确定出了什么问题以及如何解决问题，我怀疑的一点是我错过了一些配置并且欢迎任何提示

由于

Answer 1

向@Entity类添加Honey注释，以便Hibernate将其识别为实体。

com.hibernate.domain.Bee.honey上的@OneToOne或@ManyToOne引用了一个未知实体

1 个答案: