Java Hibernate org.hibernate.AnnotationException：<class>上的@OneToOne或@ManyToOne引用了一个未知实体：<class> </class> </class>

Question

我在Title上收到Hibernate Exception。我发现常见的问题是实体没有在hibernate配置文件中列出。但就我而言，我在hibernate配置文件中键入了类名。

以下是我的代码片段：

Jenis.java

@Entity
@Table(name = "JENIS", schema = "APP")
public class Jenis implements java.io.Serializable {
private int id;
private int cloudid;
private String nama_jenis;

private List<Item> items;

public Jenis() {
}

...

 @OneToMany(mappedBy="jenis", cascade = CascadeType.ALL, fetch=FetchType.LAZY)
 public List<Item> getItems() {
 return items;
 }

 public void setItems(List<Item> items) {
 this.items = items;
 }

}

Item.java

@Entity
@Table(name = "ITEM", schema = "APP")
public class Item implements java.io.Serializable {
    private Jenis jenis;

...

    @ManyToOne
    @JoinColumn(name = "JENIS")
    public Jenis getJenis() {
        return jenis;
    }

    public void setJenis(Jenis jenis) {
        this.jenis = jenis;
    }
...

hibernate.cfg.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate 
     Configuration DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="">

    <property name="hibernate.dialect">org.hibernate.dialect.DerbyDialect
    </property>
    <property name="connection.pool_size">5</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    <property name="hibernate.hbm2ddl.auto">create</property>

    ....

    <mapping class="com.mypackage.beans.Jenis" />
    <mapping class="com.mypackage.beans.Item" />

    ....

</session-factory>
 </hibernate-configuration>

Answer 1

Hibernate想要每个表中的主键。请确保您的两个表都有@ID注释