Create object using object manager in magento 2

Question

I want to load that $configLoader without constructor i tried like below, but it's not working please tell me any other way to load that ConfigLoaderInterface without constructor.

<?php
namespace NameSpace\Module\Console\Command;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Magento\Framework\Exception\LocalizedException;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
class CustomCommandClass extends Command
{
 public function __construct(
 \Magento\Framework\App\State $state,
 \Magento\Framework\ObjectManagerInterface $objectManager,
 \Magento\Framework\ObjectManager\ConfigLoaderInterface $configLoader
 ) {
 $state->setAreaCode('frontend'); //SET CURRENT AREA
 $objectManager->configure($configLoader->load('frontend')); //SOLUTION
 parent::__construct();
 }
}

I tried like below without constructor,

 $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
$configLoader = $objectManager->create('Magento\Framework\ObjectManager\ConfigLoaderInterface');
$objectManager->configure($configLoader->load('frontend'));

Answer 1

Please try using the object manager to test it even though is not recommended. Dependency injection must be used.

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$configLoader = $objectManager->get(\Magento\Framework\ObjectManager\ConfigLoaderInterface::class);
$objectManager->configure($configLoader->load('frontend'));

• Jeeva Chezhiyan: Can you share any link for brief detail about objectmanager?
• Nikolas: devdocs.magento.com/guides/v2.0/extension-dev-guide/… or alanstorm.com/magento_2_object_manager i will recommend.

Answer 2

Delete var/generation and clear cache.

Run magento setup:upgrade

It may works!