Magento2: Magento 2.2.1 - while saving product from admin getting error as Class Magento\ConfigurableProduct\Model\Product\VariationHandler does not exist

[msawyers]

Preconditions

Previous version 2.2.1
PHP version 7.1.9

Steps to reproduce:

Update Associated Configurable product and save

Expected Result:

Product should save successfully

Actual result

Error message is received: MagentoConfigurableProductModelProductVariationHandler does not exist

[magento-engcom-team]

@msawyers , thank you for your report.
We were not able to reproduce this issue by following the steps you provided. Please provide more detailed steps to reproduce or try to reproduce this issue on a clean installation or latest release.

[d10nZ]

The bug is reproduced on Magento 2.1.10 (PHP Version 7.1.12)
Sample Data is installed

1. Admin Area -> Catalog -> Products -> Edit Product;
2. Product ID: 36 (SKU: 24-MG04, Name: Aim Analog Watch);
   url: admin/catalog/product/edit/id/36/set/11/type/simple/store/0
3. Advanced Inventory popup;
4. Change product Qty to 0 (zero); Click Done; Close Popup
5. Click Product "Save" button

As a result Product have not been saved

See attached screenshots:

[BlackIkeEagle]

I think this is an issue with PHP 7.1.12, when running on PHP 7.0.26 you do not encounter this issue. There is an opcache issue in 7.1.12 and 7.2.0 which causes issues, see:
https://bugs.php.net/bug.php?id=74980
https://git.php.net/?p=php-src.git;a=commit;h=3df47c12f77a71f90778ec42e6892c828e702fb2

[BlackIkeEagle]

if you add

if (function_exists('opcache_reset')) {
    opcache_reset();
}

To index.php the issue also dissapears

[msawyers]

Hi, ok thanks will try.

[msawyers]

Hi i added to index.php and issue still remains

[BlackIkeEagle]

@msawyers you should add it after the docblock, I should have been more clear, before any other code is run you should add the if

[vitormicillo]

I just ran into my terminal
composer update
I cleaned the cache and the static files my problem was solved

Magento 2.2.1, PHP 7.1

[BlackIkeEagle]

@vitormicillo It's very specific to PHP 7.1.12 and 7.2.0 with opcache enabled

[msawyers]

Many thanks @BlackIkeEagle, works like a charm.

[vitormicillo]

@BlackIkeEagle what index.php you refer ?
what the location?

[BlackIkeEagle]

@vitormicillo depending on where your document root is, index.php in your root of your project file or pub/index.php

[Detzler]

it helped

https://github.com/magento/magento2/issues/12570#issuecomment-350510482

did it by:
php -r "opcache_reset();"

[emilshamloo]

@Detzler did you run this code in SSH?

[emilshamloo]

Thanks @BlackIkeEagle
I added your code into my index.php and it is working now.
` /**

• Application entry point
  *
• Example - run a particular store or website:

---

• require __DIR__ . '/app/bootstrap.php';
• $params = $_SERVER;
• $params[MagentoStoreModelStoreManager::PARAM_RUN_CODE] = 'website2';
• $params[MagentoStoreModelStoreManager::PARAM_RUN_TYPE] = 'website';
• $bootstrap = MagentoFrameworkAppBootstrap::create(BP, $params);
• /** @var MagentoFrameworkAppHttp $app */
• $app = $bootstrap->createApplication(MagentoFrameworkAppHttp::class);
• $bootstrap->run($app);

---

*

• Copyright © Magento, Inc. All rights reserved.
• See COPYING.txt for license details.
  */
  if (function_exists('opcache_reset')) {
  opcache_reset();
  }

try {
require __DIR__ . '/app/bootstrap.php';
} catch (Exception $e) {
echo <<

Autoload error

{$e->getMessage()}

HTML;
exit(1);
}

$bootstrap = MagentoFrameworkAppBootstrap::create(BP, $_SERVER);
/** @var MagentoFrameworkAppHttp $app */
$app = $bootstrap->createApplication(MagentoFrameworkAppHttp::class);
$bootstrap->run($app);
`

[Detzler]

@emilshamloo, yes I ran it via ssh shell

@magento-engcom-team, shouldn't we integrate "opcache_reset" into "cache:clean stack"?