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