I think I am misunderstanding the concepts of reference when it comes to controllers.

Reference class


namespace Vendor\Module\Controller\Adminhtml\Index;

use Magento\Ui\Controller\Adminhtml\Index\Render;

class Render extends Render
    public function execute()
        $component = $this->factory->create($this->_request->getParam('namespace'));
            $this->_response->appendBody((string) $this->customFunction($component->render()));
            $this->_response->appendBody((string) $component->render());

        return parent::execute();

    protected function customFunction($items){
        //code here...


<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Ui\Controller\Adminhtml\Index\Render" type="Vendor\Module\Controller\Adminhtml\Index\Render" />

I receive a error:

 Initialization error component, check the spelling of the name or the correctness of the call.

What is wrong here ? What am I missing ?


I also found this https://github.com/magento/magento2/issues/3177 . They say it was a problem with the nginx configuration, but I am using apache 2.4 ...

Magento Version 2.0.2 CE

Any ideas ?

2 Answers 2


This line should throw an error:

class Render extends Render

you cannot use an alias the same as the class name you are creating.

Instead try this

use Magento\Ui\Controller\Adminhtml\Index\Render as CoreRender;

class Render extends CoreRender
  • no change... i flushed the cache and removed the cache, page_cache and generation directories as well, run setup:upgrade - no change Mar 1, 2016 at 15:12
  • I used a different alias before that, but the result was the same... Mar 1, 2016 at 15:28
  • I will vote up your answer, because you make a very good point anyway Mar 1, 2016 at 15:42
  • I made an update, if it can help ... ? I will continue looking Mar 1, 2016 at 16:04
  • 1
    sorry. I have no idea. I will post more if I find more.
    – Marius
    Mar 1, 2016 at 16:05

Ok, nevermind, the reason why it did not work was because I invoked

return parent::execute();

Once I removed that, everything started working just fine... I have absolutely no idea why... maybe I had some old info or something..

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