code: @Override
      public <T> T invoke(Context context, Class<T> classOfT) {
          return invoke(context, classOfT, null);
      }
docs: Creates a object of class T from a form sent in the request.
  
  @param context  The context
  @param classOfT The class we expect
  @param <T>      the class ot the object to build
  @return the object, {@code null} if the object cannot be built.