如何修复“找不到符号符号：类PhotoRepository位置：类com.lelo.developer.web.rest.PhotoResource”

Question

我正在开发一个jhipster应用程序。编译时，出现了一系列与找不到符号有关的错误。

我尝试查看堆栈跟踪，并在注释掉某些行后重新运行了代码。这是导致错误的代码段：

@RequestMapping("/api")
public class PhotoResource {

    private final Logger log = LoggerFactory.getLogger(PhotoResource.class);

    private static final String ENTITY_NAME = "photo";

    private final PhotoRepository photoRepository;

    public PhotoResource(PhotoRepository photoRepository) {
        this.photoRepository = photoRepository;
    }

    /**
     * POST  /photos : Create a new photo.
     *
     * @param photo the photo to create
     * @return the ResponseEntity with status 201 (Created) and with body the new photo, or with status 400 (Bad Request) if the photo has already an ID
     * @throws URISyntaxException if the Location URI syntax is incorrect
     */
    @PostMapping("/photos")
    @Timed
    public ResponseEntity<Photo> createPhoto(@Valid @RequestBody Photo photo) throws Exception {
        log.debug("REST request to save Photo : {}", photo);
        if (photo.getId() != null) {
            throw new BadRequestAlertException("A new photo cannot already have an ID", ENTITY_NAME, "idexists");
        }

        try {
            photo = setMetadata(photo);
        } catch (ImageProcessingException ipe) {
            log.error(ipe.getMessage());
        }

        Photo result = photoRepository.save(photo);
        return ResponseEntity.created(new URI("/api/photos/" + result.getId()))
            .headers(HeaderUtil.createEntityCreationAlert(ENTITY_NAME, result.getId().toString()))
            .body(result);
    }

我得到的错误如下：

[ERROR] /home/nompumelelo/Desktop/gallery/src/main/java/io/github/jhipster/application/web/rest/PhotoResource.java:[50,19] cannot find symbol
[ERROR]   symbol:   class PhotoRepository
[ERROR]   location: class com.okta.developer.web.rest.PhotoResource
[ERROR] /home/nompumelelo/Desktop/gallery/src/main/java/io/github/jhipster/application/web/rest/PhotoResource.java:[52,26] cannot find symbol
[ERROR]   symbol:   class PhotoRepository
[ERROR]   location: class com.okta.developer.web.rest.PhotoResource
[ERROR] /home/nompumelelo/Desktop/gallery/src/main/java/io/github/jhipster/application/web/rest/PhotoResource.java:[65,66] cannot find symbol
[ERROR]   symbol:   class Photo
[ERROR]   location: class com.okta.developer.web.rest.PhotoResource
[ERROR] /home/nompumelelo/Desktop/gallery/src/main/java/io/github/jhipster/application/web/rest/PhotoResource.java:[65,27] cannot find symbol
[ERROR]   symbol:   class Photo
[ERROR]   location: class com.okta.developer.web.rest.PhotoResource