使用Spring数据进行多对多关系

Question

我正在尝试为会议室预订构建一个小型演示。

我的实体是城市->位置->楼层->从上到下具有一对多关系的房间。

这些是我的实体

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但是现在当我尝试构建时，我遇到了错误

@Entity
@Table(name="office_city")
public class City {

@Id
@GeneratedValue
private int cityId;
private String cityName;
@OneToMany(fetch = FetchType.EAGER,mappedBy="city", cascade = CascadeType.ALL)
@JsonManagedReference
private List<Location> location;

public List<Location> getLocation() {
    return location;
}
public void setLocation(List<Location> location) {
    this.location = location;
}
public int getCityId() {
    return cityId;
}
public void setCityId(int cityId) {
    this.cityId = cityId;
}
public String getCityName() {
    return cityName;
}
public void setCityName(String cityName) {
    this.cityName = cityName;
}

@Override
public String toString() {
    return "[cityId="+cityId+" cityName="+cityName+" location="+location.size()+"]";
}
}

public class Location {

@Id
@GeneratedValue
private int locationId;
private String locationName;

@ManyToOne
@JoinColumn(name="cityId")
@JsonBackReference
private City city;

@OneToMany(fetch = FetchType.EAGER,mappedBy="location",cascade=CascadeType.ALL)
@JsonManagedReference
private List<Floor> floor;


public List<Floor> getFloor() {
    return floor;
}
public void setFloor(List<Floor> floor) {
    this.floor = floor;
}
public City getCity() {
    return city;
}
public void setCity(City city) {
    this.city = city;
}
public int getLocationId() {
    return locationId;
}
public void setLocationId(int cityId) {
    this.locationId = cityId;
}
public String getLocationName() {
    return locationName;
}
public void setLocationName(String cityName) {
    this.locationName = cityName;
}
}

public class Floor {

@Id
@GeneratedValue
private int floorId;
private String floorName;

@ManyToOne
@JoinColumn(name="locationId")
@JsonBackReference
private Location location;

@OneToMany(fetch = FetchType.EAGER,mappedBy="floor",cascade=CascadeType.ALL)
@JsonManagedReference
private List<Room> room;

public List<Room> getRoom() {
    return room;
}
public void setRoom(List<Room> room) {
    this.room = room;
}
public Location getLocation() {
    return location;
}
public void setLocation(Location location) {
    this.location = location;
}
public int getFloorId() {
    return floorId;
}
public void setFloorId(int cityId) {
    this.floorId = cityId;
}
public String getFloorName() {
    return floorName;
}
public void setFloorName(String cityName) {
    this.floorName = cityName;
}
}