[Guice/MissingImplementation]：沒有綁定 ViewLoader 的實現

Question

運行gradle 運行時出現此錯誤：

1) [Guice/MissingImplementation]: No implementation for ViewLoader was bound.

Requested by:
1  : ModuleManager.<init>(ModuleManager.java:105)
      \_ for 3rd parameter
     at AppInitializer.moduleManager(AppInitializer.java:37)
      \_ for field moduleManager
     while locating AppInitializer

Learn more:

這是錯誤所在的ModuleManager.java的一部分

  @Inject
  public ModuleManager(
      AuthService authService,
      MetaModuleRepository modules,
      ViewLoader viewLoader,
      ModelLoader modelLoader,
      I18nLoader i18nLoader,
      DataLoader dataLoader,
      DemoLoader demoLoader) {
    this.authService = authService;
    this.modules = modules;
    this.viewLoader = viewLoader;
    this.dataLoader = dataLoader;
    this.demoLoader = demoLoader;
    metaLoaders = ImmutableList.of(modelLoader, viewLoader, i18nLoader);
  }

這是viewloader.java的一部分：

public abstract class ViewLoader extends AbstractParallelLoader {

  private static final Logger LOG = LoggerFactory.getLogger(ViewLoader.class);

  @Inject private ObjectMapper objectMapper;

  @Inject private MetaViewRepository views;

  @Inject private MetaSelectRepository selects;

  @Inject private MetaActionRepository actions;

  @Inject private MetaMenuRepository menus;

  @Inject private MetaActionMenuRepository actionMenus;

  @Inject private GroupRepository groups;

  @Inject private XMLViews.FinalViewGenerator finalViewGenerator;

  private final Set<String> viewsToGenerate = ConcurrentHashMap.newKeySet();
  private final Map<String, List<String>> viewsToMigrate = new ConcurrentHashMap<>();
  private final Map<String, List<Consumer<Group>>> groupsToCreate = new ConcurrentHashMap<>();

我希望這足以作為來源，我不能發布所有代碼。 我不知道錯誤是什么意思。

Answer 1

ViewLoader是一個抽象的 class。 Guice 只是說你需要提供一些它可以實例化的東西。 Guice 無法實例化抽象 class。 因此，提供具有具體實現的綁定：

class MyViewLoader extends ViewLoader {
  // Implement abstract methods.
}

然后在你的模塊中綁定實現：

  @Override public void configure() {
    bind(ViewLoader.class).to(MyViewLoader.class);
  }