Java 未记录参考等级的数据，'；空'；创建后

我有一个叫做RoomDetailDto的课程，如下所示

public class RoomDetailDto {

String ID;

@NotEmpty
String cd;

@NotEmpty
String name;

String dscp;


RoomCategoryDto roomCategoryDto;

//setter and getter

RoomCategoryTo参考另一个名为RoomCategoryTo的DTO，如下所示：

public class RoomCategoryDto {

String ID;

@NotEmpty
@Length(min = 0, max = 5)
String cd;

@NotEmpty
String name;

@NotEmpty
@NumberValue
String cost;

String dscp;

//setter and getter

@RequestMapping(value = "/updateAction", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public RoomDetailDto update(@Validated @RequestBody RoomDetailDto data) throws ParseException, RecordNotFoundException, java.text.ParseException {
    logger.info("add");
    RoomDetailEntity add = roomDetailService.updateRoomDetail(convertToEntity(data));
    return convertToDto(add);

}

我将此JSON发送到服务器

{ “cd”：“dfs23”， “名称”：“df223”， “dscp”：“sfdsfs”， “RoomCategoryTo”：{ “cd”：“KLS2”， “名称”：“Kelas 2”， “成本”：“200000”， “dscp”：空， “id”：“7f554d7a-3c5d-4c15-921d-fa4b4c629e6c” } }

发送到服务器后，该记录已成功插入，但myRoomCategoryTo为“空”

{ “cd”：“dfs23”， “名称”：“df223”， “dscp”：“sfdsfs”， “RoomCategoryTo”：空， “id”：“ed22b38d-2bc3-4c80-b035-8936318c90c7” }

有人能给我建议吗？ 请按以下方式查找我的控制器：

public class RoomCategoryDto {

String ID;

@NotEmpty
@Length(min = 0, max = 5)
String cd;

@NotEmpty
String name;

@NotEmpty
@NumberValue
String cost;

String dscp;

//setter and getter

@RequestMapping(value = "/updateAction", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public RoomDetailDto update(@Validated @RequestBody RoomDetailDto data) throws ParseException, RecordNotFoundException, java.text.ParseException {
    logger.info("add");
    RoomDetailEntity add = roomDetailService.updateRoomDetail(convertToEntity(data));
    return convertToDto(add);

}

我的实体如下

@Entity(name = "RoomCategoryEntity") @Table(name = "t_room_category") public class RoomCategoryEntity implements Serializable {

public static final long serialVersionUID = 1L;

@Id
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")
@Column(name = "ID", unique = true)
private String ID;

@Column(name = "cd")
private String cd;

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

@Column(name = "cost")
private String cost;

@Column(name = "dscp")
private String dscp;

@Column(name = "createDate")
private Date createDate;

@Column(name = "updateDate")
private Date updateDate;

@Column(name = "isDel")
private Date isDel; //setter and getter}

==================================================================

@Entity(name = "RoomDetailEntity") @Table(name = "t_room_details") public class RoomDetailEntity implements Serializable {
public static final long serialVersionUID = 1L;

@Id
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")
@Column(name = "ID", unique = true)
private String ID;

@Column(name = "cd")
private String cd;

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

@Column(name = "dscp")
private String dscp;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "room_category_id", referencedColumnName = "ID")
private RoomCategoryEntity roomCategoryEntity;

@Column(name = "createDate")
private Date createDate;

@Column(name = "updateDate")
private Date updateDate;

@Column(name = "isDel")
private Date isDel;

---

我刚刚尝试将引用表更改为实体，并成功插入

public class RoomDetailDto {

String ID;

@NotEmpty
String cd;

@NotEmpty
String name;

String dscp;

// I change below line
RoomCategoryEntity roomCategoryEntity;

[ { “cd”：“df23”， “名称”：“df23”， “dscp”：“sfdsfs”， “房间类别实体”：{ “cd”：“KLS2”， “名称”：“Kelas 2”， “成本”：“200000”， “dscp”：空， “createDate”：1497535268000， “updateDate”：空， “isDel”：空， “id”：“7f554d7a-3c5d-4c15-921d-fa4b4c629e6c” }, “id”：“02c28356-9783-46a7-8ac5-9e00497d9be2” } ]