Invalid ExtensionInterface for nonexistent class Interface with setup:di:compile

Question

I started getting this error running bin/magento setup:di:compile:

Invalid ExtensionInterface for nonexistent class Interface in file /bitnami/magento/htdocs/app/code/Magento/TestModuleExtensionAttributes/Api/Data/FakeExtensibleTwoInterface.php

Deleting the generated/ and var/ folders did not help, nor did emptying the cache and re-indexing. Has anyone encountered a problem like this?

Answer 1

I believe that you try to run the test on this installation. And test copy test modules in app/code folder and do not remove it.

Please delete app/code/Magento/Test* modules manually and re run compilation

Answer 2

I found that specifying Magento\Framework\Api\ExtensionAttributesInterface and the methods getExtensionAttributes & setExtensionAttributes in my Repository class:

namespace MY\MODULE\Api\Data;

use Magento\Framework\{
    Api\ExtensibleDataInterface,
    Api\ExtensionAttributesInterface,
    Model\ResourceModel\Db\AbstractDb
};

/** @api */
interface MyModelInterface extends ExtensibleDataInterface
{
   ......

   /** @return ExtensionAttributesInterface */
   public function getExtensionAttributes(): ExtensionAttributesInterface;

   /** 
    * @param ExtensionAttributesInterface 
    * @return CatalogProductIndexPriceLogModelInterface
    */
   public function setExtensionAttributes(ExtensionAttributesInterface $extensionAttributes): CatalogProductIndexPriceLogModelInterface;

Was causing:

php bin/magento setup:di:compile
Compilation was started.
Interception cache generation... 6/7 [========================>---]  85% 36 secs 476.0 MiBErrors during configuration scanning:
    ExtensionAttributesInterface
        Invalid ExtensionInterface for nonexistent class ExtensionAInterface in file /home/www/projects/magento2/the-block-shop/src/app/code/Convert/MonitorIndexers/Api/Data/CatalogProductIndexPriceLogModelInterface.php
Total Errors Count: 1

Removing these from the my interface but keeping them in my concrete class then running:

rm -rf generated/ && php bin/magento setup:di:compile

Worked.

Answer 3

Full path need to be set. See my case:

Answer 4

/**
 * Retrieve existing extension attributes object or create a new one.
 *
 * @return \YourVendor\YourModule\Api\Data\YourModelExtensionInterface|null
 */
  public function getExtensionAttributes();

/**
 * Set an extension attributes object.
 *
 * @param \YourVendor\YourModule\Api\Data\YourModelExtensionInterface $extensionAttributes
 * @return $this
 */
  public function setExtensionAttributes(
    \YourVendor\YourModule\Api\Data\YourModelExtensionInterface $extensionAttributes
  ): self;

for me it worked with full path