在 PostgreSQL 中编写对象时，序列生成器无法运行：“关系 [] 的列 [] 中的空值违反了非空约束”

大家好！请帮忙。我看了很多有相同错误的线程，但没有找到解决方案。

写入对象时，PostgreSQL序列生成器不起作用。
给出错误信息：

错误：关系“receiving_acts”的“doc_number”列中的空值违反了非空约束

更详细地：

"org.springframework.dao.DataIntegrityViolationException: could not
execute statement; SQL [n/a]; constraint [doc_number\" of relation
\"receiving_acts].
org.hibernate.exception.ConstraintViolationException: could not
execute statement. org.postgresql.util.PSQLException: ERROR: null
value in column \"doc_number\" of relation \"receiving_acts\" violates
not-null constraint\n  Подробности: Failing row contains
(feba8451-de26-47c2-9fe2-5381318d8deb, null, 2023-03-01 14:42:03+02,
f, 47a9bb21-fa67-4ff7-bf33-e276d23a19eb)."

有一类Entity：

@Entity
@Table(name = "receiving_acts")
@Getter
@Setter
public class ReceivingAct extends AbstractDocumentEntity {

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ra_dn_gen")
    @SequenceGenerator(name = "ra_dn_gen", sequenceName = "receiving_acts_doc_number_seq", allocationSize = 1)
    @Column(name = "doc_number")
    private Integer docNumber;

    @ManyToOne
    @JoinColumn(name = "contractor_id", nullable = false)
    private Contractor contractor;

    @OneToMany(mappedBy = "receivingAct", cascade = CascadeType.ALL)
    private List<ReceivingActTSVehiclesLine> tableVehicles;
}

@Id类型字段UUID在类中AbstractDocumentEntity并且没有问题，生成器可以工作。
DDL表创建：

CREATE SEQUENCE IF NOT EXISTS receiving_acts_doc_number_seq AS INTEGER INCREMENT BY 1;

CREATE TABLE receiving_acts
(
    id            UUID                     NOT NULL DEFAULT gen_random_uuid(),
    doc_number    INTEGER                  NOT NULL DEFAULT nextval('receiving_acts_doc_number_seq'),
    date_time     TIMESTAMP WITH TIME ZONE NOT NULL,
    marked        BOOLEAN                  NOT NULL,
    contractor_id UUID                     NOT NULL,
    CONSTRAINT pk_receiving_acts PRIMARY KEY (id),
    FOREIGN KEY (contractor_id) REFERENCES contractors (id)
);

控制器类中的方法：

@PostMapping("/")
@ResponseStatus(HttpStatus.CREATED)
public ReceivingActResponse createReceivingAct(@RequestBody ReceivingActRequest docRequest) {
    ReceivingAct docEntity = receivingActMapper.toReceivingActEntity(docRequest);
    ReceivingAct savedDocEntity = receivingActService.add(docEntity);
    return receivingActMapper.toReceivingActResponse(savedDocEntity);
}

add课堂上的方法ReceivingActServiceImpl：

@Override
public ReceivingAct add(ReceivingAct receivingAct) {
    return receivingActRepository.save(receivingAct);
}

该方法save是存储库中的标准方法ReceivingActRepository：

public interface ReceivingActRepository extends JpaRepository<ReceivingAct, UUID> {
}

JSON发帖要求：

{
    "docDateTime": "2023-03-03 11:53:56",
    "contractorId": "47a9bb21-fa67-4ff7-bf33-e276d23a19eb",
    "tableVehicles": [
        {
            "grossWeight": 1564.910,
            "vinCodeId": "d7094b75-fefc-4745-a4b6-4c5d4a2f97c3",
            "cellId": "bba1f527-a815-41ac-bbf9-aa5433d2d888"
        }
    ]
}

结果，在创建对象时，docNumber它被初始化null，以及id. 但id它返回生成，但docNumber不是。

类型改为Integer，int生成不发生，初始化0，写入0。

数据库中的序列被创建，它被锚定到一个字段。如果您手动添加一行，则会docNumber生成它。

试图@Column添加columnDefinition = "integer default nextval('receiving_acts_doc_number_seq')，没有帮助。

我不知道在哪里看，在哪里挖掘。也许您需要在保存之前以某种方式自己生成它，但这是不合逻辑的。也许当有另一个序列时，需要一种不同的方法。