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我正在尝试为我的所有实体创建一个抽象的公共类。这是我的实体类和抽象类：-

@Entity
@MappedSuperclass
@Table(name="TBL_EMPLOYEES")
public class EmployeeEntity extends IdVersion {


    @Column(name="first_name")
    private String firstName;
    
    @Column(name="last_name")
    private String lastName;
    
    @Column(name="email", nullable=false, length=200)
    private String email;


    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "EmployeeEntity [firstName=" + firstName +
                ", lastName=" + lastName + ", email=" + email   + "]";
    }
}


 @MappedSuperclass
 public abstract class IdVersion {

    @GeneratedValue
    @Column(name = "id")
    private Long id;

    @Version
    private Long version;

    @CreatedBy
    @Column(name = "created_by")
    private String createdBy;

    @CreatedDate
    private Instant created;

    @LastModifiedBy
    @Column(name = "updated_by")
    private String updatedBy;

    @LastModifiedDate
    private Instant updated;

}

错误：-

HibernateJpaConfiguration.class]: init 方法调用失败；嵌套异常是 org.hibernate.AnnotationException：没有为实体指定标识符：com.howtodoinjava.demo.model.EmployeeEntity

怎么了？如何解决？

更新的问题：

现在我有一个子类如下： -

    @Entity
@Table(name="TBL_SUB_EMPLOYEES")
public class SubEmployeeEntity extends EmployeeEntity {

    @Column(name="sub_title")
    private String subTitle;

    @Column(name="sub_role")
    private String subRole;
}

我得到了这样的错误： -

调用 init 方法失败；嵌套异常是 org.hibernate.AnnotationException：不能同时使用 @Entity 和 @MappedSuperclass 注释实体：com.test.EmployeeEntity

错误很明显我不能同时拥有@Entity 和@MappedSuperclass。但这是共同的要求。我需要子类中父类的所有属性。如何在我的代码中实现这一点？

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1 回答 1

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您需要在抽象类中使用 @MappedSuperclass 注释。

参考：https ://vladmihalcea.com/how-to-inherit-properties-from-a-base-class-entity-using-mappedsuperclass-with-jpa-and-hibernate/

于 2020-11-05T15:50:03.480 回答