Class "Magento\Framework\Search\Adapter\Mysql\Mapper" does not exist

Question

After Upgrade Magento latest version problem is showing under custom module.

pc-114@pc114-desktop:/var/www/html/gossip$ sudo bin/magento setup:di:compile
Compilation was started.
Area configuration aggregation... 5/9 [===============>------------]  55% 21 secs 312.0 MiB
In ClassReader.php line 57:
                                                                                                                                                                                                          
  Impossible to process constructor argument Parameter #6 [ <required> Magento\Framework\Search\Adapter\Mysql\Mapper $mapper ] of Manadev\ProductCollection\Resources\Filters\SearchFilterResource class  
                                                                                                                                                                                                          

In GetParameterClassTrait.php line 34:
                                                                        
  Class "Magento\Framework\Search\Adapter\Mysql\Mapper" does not exist  
                                                                        

setup:di:compile

Answer 1

Run this command on you root

grep -r "Magento\Framework\Search\Adapter\Mysql\Mapper" app/

It will show you the file name where you override this class.

Just Disable/Remove those overrides from the di.xml (Any preference/virtual classes/plugin) and also delete those overrides PHP file as well otherwise whenever setup:di:compile runs same error will come.

Answer 2

Your issue was caused by Manadev Multiple Select Layered Navigation (Filters) extension, your current extension version is not compatible with Magento 2.4 due to Magento\Framework\Search\Adapter\Mysql\Mapper $mapper was removed since Magento 2.4

So, there are some approaches for you:

1. Upgrade Manadev Multiple Select Layered Navigation (Filters) extension to the latest version to check if it resolves your issue.
2. If solution 1 does not work, you have to investigate Manadev extension to fix the issue.
   Hints: Constructor argument Parameter number #6 in Manadev\ProductCollection\Resources\Filters\SearchFilterResource class required Magento\Framework\Search\Adapter\Mysql\Mapper but Magento\Framework\Search\Adapter\Mysql\Mapper class does not exist (removed) in Magento 2.4
   Run this command to find the file path of Manadev\ProductCollection\Resources\Filters\SearchFilterResource class:
   grep -r --include \*.php "Magento\\\Framework\\\Search\\\Adapter\\\Mysql\\\Mapper $mapper" app vendor
3. If you don't have time or do not ready to fix Manadev extension, you should disable it.