java - 访问字段时出错(使用 Hibernate/JPA)

Question

我遇到了这个错误

Error accessing field [private java.lang.Integer fearx.projects.animal.finder.api.entity.LoginEntity.id] by reflection for persistent property [fearx.projects.animal.finder.api.entity.LoginEntity#id] : 2; nested exception is org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.Integer fearx.projects.animal.finder.api.entity.LoginEntity.id] by reflection for persistent property [fearx.projects.animal.finder.api.entity.LoginEntity#id] : 2

当我尝试这样做时:

public void registerUser(OwnerEntity body) {
    ownerRepository.save(body);
    loginRepository.save(new LoginEntity(body.getEmail(), body.getPassword()));
    LoginEntity loginEntity = loginRepository.findByEmail(body.getEmail());
    OwnerEntity ownerEntity = ownerRepository.findByEmail(body.getEmail());
    ownerLoginRepository.save(new OwnerLoginEntity(loginEntity.getId(),ownerEntity.getId()));
}

我的实体:

@Entity(name = "owner_login")
@Data
public class OwnerLoginEntity {

    @Id
    @GeneratedValue
    private Integer id;

    @ManyToOne(targetEntity = LoginEntity.class)
    @JoinColumn(name = "id_login", referencedColumnName = "id")
    private Integer login;

    @ManyToOne(targetEntity = OwnerEntity.class)
    @JoinColumn(name = "id_owner", referencedColumnName = "id")
    private Integer owner;

    public OwnerLoginEntity(Integer login, Integer owner) {
        this.login = login;
        this.owner = owner;
    }
}

<小时/>

public class OwnerEntity {

    @Id
    @GeneratedValue
    private Integer id;
    @Column
    private String name;
    @Column
    private String email;
    @Column
    private String phone;
    @Column
    private String password;
    @ManyToOne(targetEntity = LostPetEntity.class)
    @JoinColumn(name = "id_pet", referencedColumnName = "id")
    private Integer id_pet;
}

<小时/>

 @Entity(name = "login")
    @Data
    public class LoginEntity {
        @Id
        @GeneratedValue
        private Integer id;
        @Column(unique = true, nullable = false)
        private String email;
        @Column
        private String password;

        public LoginEntity(String email, String password) {
            this.email = email;
            this.password = password;
        }

        public LoginEntity() {
        }

}

Answer 1

O不知道你有什么数据库，但尝试改变GenerateValue的方法，如下所示:

@Entity(name = "owner_login")
@Data
public class OwnerLoginEntity {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;

    @ManyToOne
    private LoginEntity login;

    @ManyToOne
    private OwnerEntity owner;

    public OwnerLoginEntity(LoginEntity login, OwnerEntity owner) {
        this.login = login;
        this.owner = owner;
    }
}

然后你可以调用ownerLoginRepository.save(new OwnerLoginEntity(loginEntity, OwnerEntity));