[Guice/MissingImplementation]: No implementation for ViewLoader was bound-CodePudding

I am getting this error when running gradle run :

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:

this is a partion of ModuleManager.java where the bug is

  @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);
  }

and this is a portion of viewloader.java :


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<>();

I hope this is enough as a source, I can't post all the code. I don't know what the error means.

CodePudding user response：

ViewLoader is an abstract class. Guice simply says that you need to provide something it can instanciate. Guice can't instantiate abstract class. So provide a binding with a concrete implementation:

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

Then bind the implementation in your module:

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