docs: public CategoryOverview getCategories() {
          ClientResource resource = new ClientResource(Route.ALL_CATEGORY.url());
  
          try {
              Representation repr = resource.get();
              return mapper.readValue(repr.getText(), CategoryOverview.class);
          } catch (IOException ex) {
              LEX4JLogger.log(Level.WARNING, "Could not retrieve the categories correctly!");
              return null;
          }
      }