小编kur*_*ion的帖子

我目前正在使用spring创建一个网站,我偶然发现了这个基本场景,我对如何解决这个特定代码一无所知:Entity = Optional;

RoomEntity roomEntity =  roomRepository.findById(roomId);

ReservationResource(API请求类):

    public class ReservationResource {
    @Autowired
    RoomRepository roomRepository;

    @RequestMapping(path = "/{roomId}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public ResponseEntity<RoomEntity> getRoomById(
    @PathVariable
    Long roomId){
        RoomEntity roomEntity =  roomRepository.findById(roomId);
        return new ResponseEntity<>(roomEntity, HttpStatus.OK);}
    }}

RoomRepository类:

public interface RoomRepository extends CrudRepository<RoomEntity, Long> {
    List<RoomEntity> findAllById(Long id);
}

RoomEntity

@Entity
@Table(name = "Room")
public class RoomEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @NotNull
    private Integer roomNumber;

    @NotNull
    private String price;

    public RoomEntity() {
        super();
    } …

当我执行 tns run ios 时，一切都很好，但是 tns run android 只是给了我这样的错误。我尝试了设备和模拟器，但结果相同。

我已经做好了：

• 重新安装平台、节点模块、钩子。tns 医生没有做错
• 清除 webstorm 上的缓存（android studio 项目没有问题）
• 运行）用 tns create 创建了新的 {N} 文件，但发生了同样的错误
• 将 'applicationId = "org.nativescript.fagck_app"' 放在我的
• app.gradle 文件。多次重启 PC/adb。运行`tns调试
• android --debug-brk` 但仍然发生同样的错误
• 重新安装 brew jdk8

错误代码：

Installing on device 2744b499...
Successfully installed on device with identifier '2744b499'.
Application org.nativescript.fagck_app is not running on device 2744b499.
This issue may be caused by:
        * crash at startup (try `tns debug android --debug-brk` to check why it crashes)
        * different application …