code: @Override
      public java.util.concurrent.Future<ListTaskDefinitionsResult> listTaskDefinitionsAsync(
              com.amazonaws.handlers.AsyncHandler<ListTaskDefinitionsRequest, ListTaskDefinitionsResult> asyncHandler) {
  
          return listTaskDefinitionsAsync(new ListTaskDefinitionsRequest(), asyncHandler);
      }
docs: Simplified method form for invoking the ListTaskDefinitions operation with an AsyncHandler.
  
  @see #listTaskDefinitionsAsync(ListTaskDefinitionsRequest, com.amazonaws.handlers.AsyncHandler)