我创建了一个简单的Web REST应用程序，该应用程序必须将“更改票证”保存到数据库中。但是，当我尝试使用JSON作为正文创建POST请求时，出现错误：

2020-11-28 14:06:10.449 DEBUG 14864 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed 400 BAD_REQUEST
2020-11-28 14:06:10.453 DEBUG 14864 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for POST "/error", parameters={}
2020-11-28 14:06:10.455 DEBUG 14864 --- [nio-8080-exec-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2020-11-28 14:06:10.464 DEBUG 14864 --- [nio-8080-exec-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Using 'application/json', given [*/*] and supported [application/json, application/*+json, application/json, application/*+json]
2020-11-28 14:06:10.464 DEBUG 14864 --- [nio-8080-exec-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [{timestamp=Sat Nov 28 14:06:10 CET 2020, status=400, error=Bad Request, message=, path=/change/save}]
2020-11-28 14:06:10.476 DEBUG 14864 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 400

我正在使用Spring Boot 2，将MySQL作为DB和MapStruct将DTO转换为实体，反之亦然。我也使用Project Lombok摆脱了一些样板代码

我的控制器POST方法如下所示：

@RestController
@Slf4j
@RequestMapping({"/change"})
public class ChangeTicketController { 
@PostMapping(value = "/save", consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<String> save(@RequestBody @Validated ChangeTicketDto changeTicketDto){
        ChangeTicket mappedChangeTicket = changeTicketMapper.changeTicketDtoToChangeTicket(changeTicketDto);
        ChangeTicket savedTicket = changeService.save(mappedChangeTicket);
        return ResponseEntity.created(URI.create(BASE_URL + "/save/" + savedTicket.getChangeId()))
                .body("Change Ticket has been saved");
    }
}

我要保存的实体如下所示：

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
public class ChangeTicket extends BaseItem{

    //some constructor

    @NotBlank
    private String changeId;    // public ID set by user

    @NotNull
    @Enumerated(value = EnumType.STRING)
    private ChangeType changeType;


    @NotBlank
    @Size(min = 15, max = 500)
    @Column(length = 500)
    private String description;

}

超类：

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@MappedSuperclass
public class BaseItem {

    @JsonIgnore
    @Id
    @GeneratedValue(generator="system-uuid")
    @GenericGenerator(name="system-uuid", strategy = "uuid")
    private String id;      // Secret ID generated by DB

    @Enumerated(value = EnumType.STRING)
    @NotNull
    @Column(name = "item_status")
    private ItemStatus itemStatus;

    @CreationTimestamp
    @Column(name = "created_at", updatable = false)
    private Timestamp createdAt;

    @UpdateTimestamp
    @Column(name = "updated_at",updatable = true)
    private Timestamp updatedAt;

    @Column(name = "closed_at", updatable = false)
    private Timestamp closedAt;


    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "incidentSolver_id", referencedColumnName = "id")   // owning side
    private IncidentSolver incidentSolver;


    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "user_id", referencedColumnName = "id")
    private User user;
}

这是我通过POSTMAN发送给POST请求的示例JSON代码：http：// localhost：8080 / change / save

{
    "changeId": "86edd7ea-4c37-4dd9-a55c-aeea171e0b42",
    "changeType": "OS_SETTINGS_CHANGE",
    "description": "description",
    "itemStatus": "OPEN",
    "createdAt": "2020-11-28T12:51:58+00:00",
    "updatedAt": "2020-11-28T12:55:08+00:00",
    "closedAt":"",
    "incidentSolver": [
        {
            "incidentId": "015f3e95-de08-4035-9052-9d40ad2b7af6",
            "userName": "ThisDude"
        }
    ],
    "user": [
        {
            "userId": "3d00339a-5757-4ada-a316-6705ff603d96",
            "userType": "CUSTOMER",
            "userName": "WednesdayDude"
        }
    ]
}

我不知道杰克逊不知道如何反序列化/序列化子对象和父对象是否存在问题，或者我是否在错误地构建我的Json。如果你需要查看我的服务类存储库，我将编辑此帖子以显示它们。

编辑：添加ChangeTicketDTO

@Getter
@Setter
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class ChangeTicketDto extends BaseItemDto {

    private String changeId;    // public ID set by user

    private ChangeType changeType;
    private String description;
}

BaseItemDTO

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class BaseItemDto {

    private ItemStatus itemStatus;
    private Timestamp createdAt;
    private Timestamp updatedAt;
    private Timestamp closedAt;
    private IncidentSolver incidentSolver;
    private User user;
}

谢谢你们的帮助