Field with @OneToOne annotation in super class in Hibernate

Question

I have class Document , which contains field Ad ad with @OneToOne annotation. Class ResultDocument extends Document, JOINED inheritance strategy is applied. When I start my app, I get error: org.hibernate.MappingException: property [ad] not found on entity [ua.translate.model.ad.ResultDocument]

Please, explain me cause of this error.

class Document:

@Entity
@Table(name = "INIT_DOCUMENT_TEST")
@Inheritance(strategy = InheritanceType.JOINED)
public class Document {


@Id
@SequenceGenerator(name = "standart",initialValue = 1)
@GeneratedValue(generator = "standart",strategy =GenerationType.SEQUENCE)
@Column(name = "DOCUMENT_ID")
private long id;

@Lob
@Column(name = "DOCUMENT_FILE",nullable = false)
private byte[] file;

@Column(name = "DOCUMENT_FILE_NAME",nullable = false)
private String fileName;

@Column(name = "DOCUMENT_CONTENT_TYPE",nullable = false)
private String contentType;

@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "DOCUMENT_AD_ID")
private Ad ad;
.....
}

class ResultDocument:

@Entity
@Table(name = "RESULT_DOCUMENT_TEST")
@PrimaryKeyJoinColumn(name= "result_document_id")
public class ResultDocument extends Document{

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "TRANSLATOR",nullable = false)
    private Translator downloader;
    .....
}

Answer 1

我认为您不应该从Document扩展，因为如果您使用的是hibernate或JPA，该技术将使用该关系而不执行继承。