Spring Boot 2.4.0 ，数据库为mysql 8 .
每隔15秒用rest从远程获取数据，并用rest将其存储到mysql数据库 saveAll() .
为所有给定实体调用save（）方法。
所有数据都已设置id。
我希望如果db没有这样的id，它会被插入。
如果这样的id已经出现在db-它将被更新。
这里是从控制台剪下来的：

Hibernate: 
    insert 
    into
        iot_entity
        (controller_ref, description, device_id, device_ref, entity_type_ref, hw_address, hw_serial, image_ref, inventory_nr, ip6address1, ip6address2, ip_address1, ip_address2, latlng, location, mac_address, name, params, status, tenant, type, id) 
    values
        (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
...
2020-12-05 23:18:28.269 ERROR 15752 --- [  restartedMain] o.h.e.jdbc.batch.internal.BatchingBatch  : HHH000315: Exception executing batch [java.sql.BatchUpdateException: Duplicate entry '1' for key 'iot_entity.PRIMARY'], SQL: insert into iot_entity (controller_ref, description, device_id, device_ref, entity_type_ref, hw_address, hw_serial, image_ref, inventory_nr, ip6address1, ip6address2, ip_address1, ip_address2, latlng, location, mac_address, name, params, status, tenant, type, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
2020-12-05 23:18:28.269  WARN 15752 --- [  restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 1062, SQLState: 23000
2020-12-05 23:18:28.269 ERROR 15752 --- [  restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper   : Duplicate entry '1' for key 'iot_entity.PRIMARY'
2020-12-05 23:18:28.269 DEBUG 15752 --- [  restartedMain] o.s.orm.jpa.JpaTransactionManager        : Initiating transaction rollback after commit exception

org.springframework.dao.DataIntegrityViolationException: could not execute batch; SQL [insert into iot_entity (controller_ref, description, device_id, device_ref, entity_type_ref, hw_address, hw_serial, image_ref, inventory_nr, ip6address1, ip6address2, ip_address1, ip_address2, latlng, location, mac_address, name, params, status, tenant, type, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)]; constraint [iot_entity.PRIMARY]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute batch

下面是获取和保存的方法：

@Override
@SneakyThrows
@Scheduled(fixedDelay = 15_000)
@Transactional(propagation = Propagation.REQUIRES_NEW)
public void fetchAndStoreData() {
    IotEntity[] entities = restTemplate.getForObject(properties.getIotEntitiesUrl(), IotEntity[].class);

    log.debug("ENTITIES:\n{}", mapper.writerWithDefaultPrettyPrinter().writeValueAsString(entities));

    if (entities != null && entities.length > 0) {
        entityRepository.saveAll(List.of(entities));
    } else {
        log.warn("NO entities data FETCHED !!!");
    }
}

此方法每15秒运行一次。
实体：

@Data
@Entity
@NoArgsConstructor
@EqualsAndHashCode(of = {"id"})
@ToString(of = {"id", "deviceId", "entityTypeRef", "ipAddress1"})
public class IotEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    private Integer id;
    // other fields

和存储库：

public interface EntityRepository extends JpaRepository<IotEntity, Integer> {
}

以下是json格式的iot实体截图：

2020-12-05 23:18:44.261 DEBUG 15752 --- [pool-3-thread-1] EntityService : ENTITIES:
[ {
  "id" : 1,
  "controllerRef" : null,
  "name" : "Local Controller Unterföhring",
  "description" : "",
  "deviceId" : "",
  ...

所以身份证已经确定了。
此外，还为项目启用了批处理。它不应该对储蓄有任何影响。
我不明白为什么它试图插入一个新的实体而不是更新现有的实体？
为什么它不能区分新旧实体的区别？
更新：
为实体实现持久化：

@Data
@Entity
@NoArgsConstructor
@EqualsAndHashCode(of = {"id"})
@ToString(of = {"id", "deviceId", "entityTypeRef", "ipAddress1"})
public class IotEntity implements Serializable, Persistable<Integer> {
    private static final long serialVersionUID = 1L;

    @Id
    private Integer id;

    @Override
    public boolean isNew() {
        return false;
    }

    @Override
    public Integer getId() {
        return this.id;
    }

但是，它失败了，只有一个例外- Duplicate entry '1' for key 'iot_entity.PRIMARY' 如果我再加上 @GeneratedValue 如下所示：

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

不会失败的。但是，它将自己更新id值。
例如，它用 id = 15 :

[ {
  "id" : 15,
  "carParkRef" : 15,
  "name" : "UF Haus 1/2",

应按以下方式保存：

事实上它有 id = 2 取而代之的是：

这是不正确的。
试图添加到存储服务：

private final EntityManager entityManager;
...
List.of(carParks).forEach(entityManager::merge);

失败时出现相同的异常（有或没有实现persistable）。它试图插入值- insert into ... Duplicate entry '15' for key '... .PRIMARY' 来自的代码段 application.yml :

spring:
  # ===============================
  # = DATA SOURCE
  # ===============================
  datasource:
    url: jdbc:mysql://localhost:3306/demo_db
    username: root
    password: root
    initialization-mode: always

  # ===============================
  # = JPA / HIBERNATE
  # ===============================
  jpa:
    show-sql: true
    generate-ddl: true
    hibernate:
      ddl-auto: update
    properties:
      hibernate:
        format_sql: true
        generate_statistics: true

在这里您可以看到pom文件内容。
如何解决这个问题？