Symfony table entity has itself recognized as repository as well - php

Question

New to both Symfony and StackOverflow as an OP.
I'm on a way adding new mysql table entities and repositories on Symfony(4.3.2) and get stuck as I test it.
I really appreciate someone's help.
The error I got was
[2020-07-13 03:25:59] request.CRITICAL: Uncaught PHP Exception RuntimeException: "The "App\Entity\Foo" entity has a repositoryClass set to "App\Repository\Foo", but this is not a valid class. Check your class naming. If this is meant to be a service id, make sure this service exists and is tagged with "doctrine.repository_service"." at /var/www/html/bar_project/vendor/doctrine/doctrine-bundle/Repository/ContainerRepositoryFactory.php line 66 {"exception":"[object] (RuntimeException(code: 0): The \"App\\Entity\\Foo\" entity has a repositoryClass set to \"App\\Repository\\Foo\", but this is not a valid class. Check your class naming. If this is meant to be a service id, make sure this service exists and is tagged with \"doctrine.repository_service\". at /var/www/html/bar_project/vendor/doctrine/doctrine-bundle/Repository/ContainerRepositoryFactory.php:66)"} []
where Foo at /App/Entity/ is an entity for the table foo.
and the problem is that it tries to refer to Foo at App/Repository/ as its repository which doesn't exist, but not FooRepository which exists.
(Updated this paragraph following the comment from Jakumi)
(FooController.php)
$repository = $this->getDoctrine()->getRepository(Foo::class);
(Foo.php)
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Table(name="foo")
* #ORM\Entity(repositoryClass="App\Repository\FooRepository") // *1
*/
class Foo
{
...
(FooRepository.php)
<?php
namespace App\Repository;
use App\Entity\Foo;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Symfony\Bridge\Doctrine\RegistryInterface;
/**
* #method Foo|null find($id, $lockMode = null, $lockVersion = null)
* ...
*/
class FooRepository extends ServiceEntityRepository
{
...
One thing I find mysterious is that the same error log still shows up even if I remove *1.
(I think I have yarn watch and cache clear appropriately working.)
Additional Info 1
(doctrine.yaml)
doctrine:
dbal:
# configure these for your database server
driver: 'pdo_mysql'
server_version: '8.0'
charset: utf8mb4
default_table_options:
charset: utf8mb4
collate: utf8mb4_unicode_ci
# dbname:
# host:
# port:
# user:
# password:
url: '%env(resolve:DATABASE_URL)%'
options:
1002: 'SET sql_mode=(SELECT REPLACE(##sql_mode, "ONLY_FULL_GROUP_BY", ""))'
orm:
auto_generate_proxy_classes: true
naming_strategy: doctrine.orm.naming_strategy.underscore
auto_mapping: true
metadata_cache_driver: apcu
result_cache_driver: apcu
query_cache_driver: apcu
connection: ~
mappings:
App:
is_bundle: false
type: annotation
dir: '%kernel.project_dir%/src/Entity'
prefix: 'App\Entity'
alias: App
dql:
string_functions:
group_concat: DoctrineExtensions\Query\Mysql\GroupConcat
date_format: DoctrineExtensions\Query\Mysql\DateFormat