Fix plugin path in DI.xml

Use correct Serialize class in constructor
Define class in doc

Author: tansezer

app/code/Magento/ConfigurableProduct/Plugin/Product/Initialization/CleanConfigurationTmpImages.php

@@ -39,7 +39,7 @@ class CleanConfigurationTmpImages
     private $request;
 
     /**
-     * @var \Magento\Framework\Serialize\SerializerInterface
+     * @var \Magento\Framework\Serialize\Serializer\Serialize
      */
     private $serialize;
 
@@ -48,14 +48,16 @@ class CleanConfigurationTmpImages
      * @param \Magento\MediaStorage\Helper\File\Storage\Database $fileStorageDb
      * @param \Magento\Catalog\Model\Product\Media\Config $mediaConfig
      * @param \Magento\Framework\Filesystem $filesystem
+     * @param \Magento\Framework\Serialize\Serializer\Serialize $serialize
+     *
      * @throws \Magento\Framework\Exception\FileSystemException
      */
     public function __construct(
         \Magento\Framework\App\RequestInterface $request,
         \Magento\MediaStorage\Helper\File\Storage\Database $fileStorageDb,
         \Magento\Catalog\Model\Product\Media\Config $mediaConfig,
         \Magento\Framework\Filesystem $filesystem,
-        \Magento\Framework\Serialize\SerializerInterface $serialize
+        \Magento\Framework\Serialize\Serializer\Serialize $serialize
     ) {
         $this->request = $request;
         $this->fileStorageDb = $fileStorageDb;
@@ -71,6 +73,7 @@ public function __construct(
      * @param \Magento\Catalog\Model\Product $configurableProduct
      *
      * @return \Magento\Catalog\Model\Product
+     * @throws \Magento\Framework\Exception\FileSystemException
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function afterInitialize(

app/code/Magento/ConfigurableProduct/etc/adminhtml/di.xml

@@ -9,7 +9,7 @@
     <type name="Magento\Catalog\Controller\Adminhtml\Product\Initialization\Helper">
         <plugin name="configurable" type="Magento\ConfigurableProduct\Controller\Adminhtml\Product\Initialization\Helper\Plugin\Configurable" sortOrder="50" />
         <plugin name="updateConfigurations" type="Magento\ConfigurableProduct\Controller\Adminhtml\Product\Initialization\Helper\Plugin\UpdateConfigurations" sortOrder="60" />
-        <plugin name="cleanConfigurationTmpImages" type="Magento\ConfigurableProduct\Controller\Adminhtml\Product\Initialization\Helper\Plugin\CleanConfigurationTmpImages" sortOrder="999" />
+        <plugin name="cleanConfigurationTmpImages" type="Magento\ConfigurableProduct\Plugin\Product\Initialization\CleanConfigurationTmpImages" sortOrder="999" />
     </type>
     <type name="Magento\Catalog\Controller\Adminhtml\Product\Builder">
         <plugin name="configurable" type="Magento\ConfigurableProduct\Controller\Adminhtml\Product\Builder\Plugin" sortOrder="50" />