我创建了一个名为“commonclass”的mappedsuperclass，其中包含大量其他类的一些commons属性。另外，我需要该类指定公共关系，例如与另一个名为“relationclass”的类。
我是这样说的：

/* ##### CommonClass ##### */
@MappedSuperclass
public class CommonClass {

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

    @ManyToOne
    @JoinColumn(name = "fk_relation_class")
    private RelationClass relationClass;

    // === Class getters & setters ===============================
    ... 
}
/* ##### CommonClass ##### */

/* ##### ChildClass ##### */
@Entity
public class ChildClass extends CommonClass{

    private String specificAttribute;
    ...

    // === Class getters & setters ===============================
    ...
}
/* ##### ChildClass ##### */

/* ##### RelationClass ##### */
@Entity
public class RelationClass {

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

    @OneToMany(mappedBy = "relationClass")
    private List<CommonClass> commonList = new ArrayList<CommonClass>();

    // === Class getters & setters ===============================
    ...
}
/* ##### RelationClass ##### */

问题是dosen没有将commonclass识别为实体，这是正确的，但它是一个mapped超类，因此逻辑上应该使子类继承关系。
这是我得到的错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.xxx.dao.entities.RelationClass.objectList[com.xxx.dao.entities.CommonClass]
...
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.xxx.dao.entities.RelationClass.objectList[com.xxx.dao.entities.CommonClass]