diff --git a/src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php b/src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php
index d36b3f9a70..35f685ddf9 100644
--- a/src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php
+++ b/src/Symfony/Bridge/Doctrine/CacheWarmer/ProxyCacheWarmer.php
@@ -11,7 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\CacheWarmer;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 
 /**
@@ -26,7 +27,10 @@ class ProxyCacheWarmer implements CacheWarmerInterface
 {
     private $registry;
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
diff --git a/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php b/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
index c686af5512..a1a03d5870 100644
--- a/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
+++ b/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
@@ -11,10 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\DataCollector;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
 use Doctrine\DBAL\Logging\DebugStack;
 use Doctrine\DBAL\Types\ConversionException;
 use Doctrine\DBAL\Types\Type;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\DataCollector\DataCollector;
@@ -37,7 +38,10 @@ class DoctrineDataCollector extends DataCollector
      */
     private $loggers = [];
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
         $this->connections = $registry->getConnectionNames();
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
index f63aca5937..3c06fa25a9 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
@@ -143,7 +143,7 @@ abstract class RegisterMappingsPass implements CompilerPassInterface
 
         $mappingDriverDef = $this->getDriver($container);
         $chainDriverDefService = $this->getChainDriverServiceName($container);
-        // Definition for a Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain
+        // Definition for a Doctrine\Persistence\Mapping\Driver\MappingDriverChain
         $chainDriverDef = $container->getDefinition($chainDriverDefService);
         foreach ($this->namespaces as $namespace) {
             $chainDriverDef->addMethodCall('addDriver', [$mappingDriverDef, $namespace]);
diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
index 4e06569b4d..fa373e3849 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
@@ -11,7 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Form\ChoiceList;
 
-use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Persistence\ObjectManager;
 use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
 use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
 use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
@@ -40,9 +41,10 @@ class DoctrineChoiceLoader implements ChoiceLoaderInterface
      * passed which optimizes the object loading for one of the Doctrine
      * mapper implementations.
      *
-     * @param string $class The class name of the loaded objects
+     * @param ObjectManager|LegacyObjectManager $manager      The object manager
+     * @param string                            $class        The class name of the loaded objects
      */
-    public function __construct(ObjectManager $manager, string $class, IdReader $idReader = null, EntityLoaderInterface $objectLoader = null)
+    public function __construct($manager, string $class, IdReader $idReader = null, EntityLoaderInterface $objectLoader = null)
     {
         $classMetadata = $manager->getClassMetadata($class);
 
diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
index b255c10364..28d8245ac7 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
@@ -11,8 +11,10 @@
 
 namespace Symfony\Bridge\Doctrine\Form\ChoiceList;
 
-use Doctrine\Common\Persistence\Mapping\ClassMetadata;
-use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\Common\Persistence\Mapping\ClassMetadata as LegacyClassMetadata;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Persistence\Mapping\ClassMetadata;
+use Doctrine\Persistence\ObjectManager;
 use Symfony\Component\Form\Exception\RuntimeException;
 
 /**
@@ -35,7 +37,11 @@ class IdReader
      */
     private $associationIdReader;
 
-    public function __construct(ObjectManager $om, ClassMetadata $classMetadata)
+    /**
+     * @param ObjectManager|LegacyObjectManager $om
+     * @param ClassMetadata|LegacyClassMetadata $classMetadata
+     */
+    public function __construct($om, $classMetadata)
     {
         $ids = $classMetadata->getIdentifierFieldNames();
         $idType = $classMetadata->getTypeOfField(current($ids));
diff --git a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmExtension.php b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmExtension.php
index 891754a1da..90aca67a49 100644
--- a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmExtension.php
+++ b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmExtension.php
@@ -11,7 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Form;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Bridge\Doctrine\Form\Type\EntityType;
 use Symfony\Component\Form\AbstractExtension;
 
@@ -19,7 +20,10 @@ class DoctrineOrmExtension extends AbstractExtension
 {
     protected $registry;
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
diff --git a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
index d72146eede..ddc20a9cb3 100644
--- a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
+++ b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
@@ -11,12 +11,14 @@
 
 namespace Symfony\Bridge\Doctrine\Form;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\Mapping\MappingException;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Common\Persistence\Mapping\MappingException as LegacyCommonMappingException;
 use Doctrine\Common\Persistence\Proxy;
 use Doctrine\DBAL\Types\Type;
 use Doctrine\ORM\Mapping\ClassMetadataInfo;
 use Doctrine\ORM\Mapping\MappingException as LegacyMappingException;
+use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\Mapping\MappingException;
 use Symfony\Component\Form\FormTypeGuesserInterface;
 use Symfony\Component\Form\Guess\Guess;
 use Symfony\Component\Form\Guess\TypeGuess;
@@ -28,7 +30,10 @@ class DoctrineOrmTypeGuesser implements FormTypeGuesserInterface
 
     private $cache = [];
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
@@ -182,6 +187,8 @@ class DoctrineOrmTypeGuesser implements FormTypeGuesserInterface
                 return $this->cache[$class] = [$em->getClassMetadata($class), $name];
             } catch (MappingException $e) {
                 // not an entity or mapped super class
+            } catch (LegacyCommonMappingException $e) {
+                // not an entity or mapped super class
             } catch (LegacyMappingException $e) {
                 // not an entity or mapped super class, using Doctrine ORM 2.2
             }
@@ -192,10 +199,12 @@ class DoctrineOrmTypeGuesser implements FormTypeGuesserInterface
 
     private static function getRealClass(string $class): string
     {
-        if (false === $pos = strrpos($class, '\\'.Proxy::MARKER.'\\')) {
+        $marker = interface_exists(Proxy::class) ? '\\'.Proxy::MARKER.'\\' : '\__CG__\\';
+
+        if (false === $pos = strrpos($class, $marker)) {
             return $class;
         }
 
-        return substr($class, $pos + Proxy::MARKER_LENGTH + 2);
+        return substr($class, $pos + \strlen($marker));
     }
 }
diff --git a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
index 44e306add3..7120f3bcd9 100644
--- a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
+++ b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
@@ -12,9 +12,10 @@
 namespace Symfony\Bridge\Doctrine\Form\Type;
 
 use Doctrine\Common\Collections\Collection;
-use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\ObjectManager;
-use Doctrine\ORM\QueryBuilder;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\ObjectManager;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\EntityLoaderInterface;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\IdReader;
@@ -96,7 +97,10 @@ abstract class DoctrineType extends AbstractType implements ResetInterface
         return null;
     }
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
@@ -185,9 +189,8 @@ abstract class DoctrineType extends AbstractType implements ResetInterface
         };
 
         $emNormalizer = function (Options $options, $em) {
-            /* @var ManagerRegistry $registry */
             if (null !== $em) {
-                if ($em instanceof ObjectManager) {
+                if ($em instanceof ObjectManager || $em instanceof LegacyObjectManager) {
                     return $em;
                 }
 
@@ -257,7 +260,7 @@ abstract class DoctrineType extends AbstractType implements ResetInterface
         $resolver->setNormalizer('query_builder', $queryBuilderNormalizer);
         $resolver->setNormalizer('id_reader', $idReaderNormalizer);
 
-        $resolver->setAllowedTypes('em', ['null', 'string', 'Doctrine\Common\Persistence\ObjectManager']);
+        $resolver->setAllowedTypes('em', ['null', 'string', ObjectManager::class, LegacyObjectManager::class]);
     }
 
     /**
@@ -267,7 +270,7 @@ abstract class DoctrineType extends AbstractType implements ResetInterface
      *
      * @return EntityLoaderInterface
      */
-    abstract public function getLoader(ObjectManager $manager, $queryBuilder, string $class);
+    abstract public function getLoader(LegacyObjectManager $manager, $queryBuilder, string $class);
 
     public function getParent()
     {
diff --git a/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php b/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
index 716def9102..364492981f 100644
--- a/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
+++ b/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Bridge\Doctrine\Form\Type;
 
-use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
 use Doctrine\ORM\Query\Parameter;
 use Doctrine\ORM\QueryBuilder;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\ORMQueryBuilderLoader;
@@ -50,7 +50,7 @@ class EntityType extends DoctrineType
      *
      * @return ORMQueryBuilderLoader
      */
-    public function getLoader(ObjectManager $manager, $queryBuilder, string $class)
+    public function getLoader(LegacyObjectManager $manager, $queryBuilder, string $class)
     {
         if (!$queryBuilder instanceof QueryBuilder) {
             throw new \TypeError(sprintf('Expected an instance of %s, but got %s.', QueryBuilder::class, \is_object($queryBuilder) ? \get_class($queryBuilder) : \gettype($queryBuilder)));
diff --git a/src/Symfony/Bridge/Doctrine/ManagerRegistry.php b/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
index a81357a121..cd5192c662 100644
--- a/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
+++ b/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Bridge\Doctrine;
 
-use Doctrine\Common\Persistence\AbstractManagerRegistry;
+use Doctrine\Common\Persistence\AbstractManagerRegistry as LegacyAbstractManagerRegistry;
 use ProxyManager\Proxy\LazyLoadingInterface;
 use Symfony\Component\DependencyInjection\Container;
 
@@ -20,7 +20,7 @@ use Symfony\Component\DependencyInjection\Container;
  *
  * @author  Lukas Kahwe Smith <smith@pooteeweet.org>
  */
-abstract class ManagerRegistry extends AbstractManagerRegistry
+abstract class ManagerRegistry extends LegacyAbstractManagerRegistry
 {
     /**
      * @var Container
diff --git a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
index 896be36f84..8320bb1290 100644
--- a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+++ b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
@@ -11,12 +11,13 @@
 
 namespace Symfony\Bridge\Doctrine\PropertyInfo;
 
-use Doctrine\Common\Persistence\Mapping\MappingException;
+use Doctrine\Common\Persistence\Mapping\MappingException as LegacyMappingException;
 use Doctrine\DBAL\Types\Type as DBALType;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\Mapping\ClassMetadataInfo;
 use Doctrine\ORM\Mapping\MappingException as OrmMappingException;
+use Doctrine\Persistence\Mapping\MappingException;
 use Symfony\Component\PropertyInfo\PropertyAccessExtractorInterface;
 use Symfony\Component\PropertyInfo\PropertyListExtractorInterface;
 use Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface;
@@ -189,7 +190,7 @@ class DoctrineExtractor implements PropertyListExtractorInterface, PropertyTypeE
     {
         try {
             return $this->entityManager ? $this->entityManager->getClassMetadata($class) : $this->classMetadataFactory->getMetadataFor($class);
-        } catch (MappingException | OrmMappingException $exception) {
+        } catch (MappingException | OrmMappingException | LegacyMappingException $exception) {
             return null;
         }
     }
diff --git a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
index a8172709cd..a77889de08 100644
--- a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
+++ b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
@@ -11,10 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Security\User;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\Mapping\ClassMetadata;
-use Doctrine\Common\Persistence\ObjectManager;
-use Doctrine\Common\Persistence\ObjectRepository;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\User\PasswordUpgraderInterface;
@@ -37,7 +35,10 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
     private $class;
     private $property;
 
-    public function __construct(ManagerRegistry $registry, string $classOrAlias, string $property = null, string $managerName = null)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry, string $classOrAlias, string $property = null, string $managerName = null)
     {
         $this->registry = $registry;
         $this->managerName = $managerName;
@@ -50,7 +51,7 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
      */
     public function loadUserByUsername(string $username)
     {
-        $repository = $this->getRepository();
+        $repository = $this->registry->getManager($this->managerName)->getRepository($this->classOrAlias);
         if (null !== $this->property) {
             $user = $repository->findOneBy([$this->property => $username]);
         } else {
@@ -78,7 +79,7 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
             throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', \get_class($user)));
         }
 
-        $repository = $this->getRepository();
+        $repository = $this->registry->getManager($this->managerName)->getRepository($this->classOrAlias);
         if ($repository instanceof UserProviderInterface) {
             $refreshedUser = $repository->refreshUser($user);
         } else {
@@ -86,7 +87,7 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
             // might have changed without proper persistence in the database.
             // That's the case when the user has been changed by a form with
             // validation errors.
-            if (!$id = $this->getClassMetadata()->getIdentifierValues($user)) {
+            if (!$id = $this->registry->getManager($this->managerName)->getClassMetadata($this->classOrAlias)->getIdentifierValues($user)) {
                 throw new \InvalidArgumentException('You cannot refresh a user from the EntityUserProvider that does not contain an identifier. The user object has to be serialized with its own identifier mapped by Doctrine.');
             }
 
@@ -117,29 +118,19 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
             throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', \get_class($user)));
         }
 
-        $repository = $this->getRepository();
+        $repository = $this->registry->getManager($this->managerName)->getRepository($this->classOrAlias);
         if ($repository instanceof PasswordUpgraderInterface) {
             $repository->upgradePassword($user, $newEncodedPassword);
         }
     }
 
-    private function getObjectManager(): ObjectManager
-    {
-        return $this->registry->getManager($this->managerName);
-    }
-
-    private function getRepository(): ObjectRepository
-    {
-        return $this->getObjectManager()->getRepository($this->classOrAlias);
-    }
-
     private function getClass(): string
     {
         if (null === $this->class) {
             $class = $this->classOrAlias;
 
             if (false !== strpos($class, ':')) {
-                $class = $this->getClassMetadata()->getName();
+                $class = $this->registry->getManager($this->managerName)->getClassMetadata($this->classOrAlias)->getName();
             }
 
             $this->class = $class;
@@ -147,9 +138,4 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
 
         return $this->class;
     }
-
-    private function getClassMetadata(): ClassMetadata
-    {
-        return $this->getObjectManager()->getClassMetadata($this->classOrAlias);
-    }
 }
diff --git a/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php b/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
index 090007c069..332b33ac6f 100644
--- a/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
+++ b/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
@@ -13,12 +13,14 @@ namespace Symfony\Bridge\Doctrine\Test;
 
 use Doctrine\Common\Annotations\AnnotationReader;
 use Doctrine\Common\Cache\ArrayCache;
-use Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain;
-use Doctrine\Common\Persistence\Mapping\Driver\SymfonyFileLocator;
+use Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain as LegacyMappingDriverChain;
+use Doctrine\Common\Persistence\Mapping\Driver\SymfonyFileLocator as LegacySymfonyFileLocator;
 use Doctrine\ORM\Configuration;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
 use Doctrine\ORM\Mapping\Driver\XmlDriver;
+use Doctrine\Persistence\Mapping\Driver\MappingDriverChain;
+use Doctrine\Persistence\Mapping\Driver\SymfonyFileLocator;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -74,11 +76,13 @@ class DoctrineTestHelper
     public static function createTestConfigurationWithXmlLoader()
     {
         $config = static::createTestConfiguration();
+        $symfonyFileLocator = class_exists(SymfonyFileLocator::class) ? SymfonyFileLocator::class : LegacySymfonyFileLocator::class;
+        $driverChain = class_exists(MappingDriverChain::class) ? MappingDriverChain::class : LegacyMappingDriverChain::class;
 
         $driverChain = new MappingDriverChain();
         $driverChain->addDriver(
             new XmlDriver(
-                new SymfonyFileLocator(
+                new $symfonyFileLocator(
                     [__DIR__.'/../Tests/Resources/orm' => 'Symfony\\Bridge\\Doctrine\\Tests\\Fixtures'], '.orm.xml'
                 )
             ),
diff --git a/src/Symfony/Bridge/Doctrine/Test/TestRepositoryFactory.php b/src/Symfony/Bridge/Doctrine/Test/TestRepositoryFactory.php
index 0a44dcbf85..3074127e8f 100644
--- a/src/Symfony/Bridge/Doctrine/Test/TestRepositoryFactory.php
+++ b/src/Symfony/Bridge/Doctrine/Test/TestRepositoryFactory.php
@@ -11,10 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Test;
 
-use Doctrine\Common\Persistence\ObjectRepository;
+use Doctrine\Common\Persistence\ObjectRepository as LegacyObjectRepository;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\Repository\RepositoryFactory;
+use Doctrine\Persistence\ObjectRepository;
 
 /**
  * @author Andreas Braun <alcaeus@alcaeus.org>
@@ -40,14 +41,17 @@ final class TestRepositoryFactory implements RepositoryFactory
         return $this->repositoryList[$repositoryHash] = $this->createRepository($entityManager, $entityName);
     }
 
-    public function setRepository(EntityManagerInterface $entityManager, string $entityName, ObjectRepository $repository)
+    public function setRepository(EntityManagerInterface $entityManager, string $entityName, LegacyObjectRepository $repository)
     {
         $repositoryHash = $this->getRepositoryHash($entityManager, $entityName);
 
         $this->repositoryList[$repositoryHash] = $repository;
     }
 
-    private function createRepository(EntityManagerInterface $entityManager, string $entityName): ObjectRepository
+    /**
+     * @return ObjectRepository|LegacyObjectRepository
+     */
+    private function createRepository(EntityManagerInterface $entityManager, string $entityName)
     {
         /* @var $metadata ClassMetadata */
         $metadata = $entityManager->getClassMetadata($entityName);
diff --git a/src/Symfony/Bridge/Doctrine/Tests/DataCollector/DoctrineDataCollectorTest.php b/src/Symfony/Bridge/Doctrine/Tests/DataCollector/DoctrineDataCollectorTest.php
index 13a6c70669..1c080fa29d 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/DataCollector/DoctrineDataCollectorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/DataCollector/DoctrineDataCollectorTest.php
@@ -11,8 +11,10 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\DataCollector;
 
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
 use Doctrine\DBAL\Platforms\MySqlPlatform;
 use Doctrine\DBAL\Version;
+use Doctrine\Persistence\ManagerRegistry;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\DataCollector\DoctrineDataCollector;
 use Symfony\Component\HttpFoundation\Request;
@@ -235,7 +237,7 @@ EOTXT
             ->method('getDatabasePlatform')
             ->willReturn(new MySqlPlatform());
 
-        $registry = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $registry = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
         $registry
             ->expects($this->any())
             ->method('getConnectionNames')
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
index 6c3f880eaa..7d183351ce 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
@@ -12,7 +12,7 @@
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
 use Doctrine\Common\DataFixtures\FixtureInterface;
-use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -25,7 +25,7 @@ class ContainerAwareFixture implements FixtureInterface, ContainerAwareInterface
         $this->container = $container;
     }
 
-    public function load(ObjectManager $manager)
+    public function load(LegacyObjectManager $manager)
     {
     }
 }
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php
index c2c720a390..f9dcebeacb 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php
@@ -11,9 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Form\ChoiceList;
 
-use Doctrine\Common\Persistence\ObjectManager;
-use Doctrine\Common\Persistence\ObjectRepository;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Common\Persistence\ObjectRepository as LegacyObjectRepository;
 use Doctrine\ORM\Mapping\ClassMetadata;
+use Doctrine\Persistence\ObjectManager;
+use Doctrine\Persistence\ObjectRepository;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader;
@@ -75,8 +77,8 @@ class DoctrineChoiceLoaderTest extends TestCase
     protected function setUp(): void
     {
         $this->factory = $this->getMockBuilder('Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface')->getMock();
-        $this->om = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectManager')->getMock();
-        $this->repository = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectRepository')->getMock();
+        $this->om = $this->getMockBuilder(interface_exists(ObjectManager::class) ? ObjectManager::class : LegacyObjectManager::class)->getMock();
+        $this->repository = $this->getMockBuilder(interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class)->getMock();
         $this->class = 'stdClass';
         $this->idReader = $this->getMockBuilder('Symfony\Bridge\Doctrine\Form\ChoiceList\IdReader')
             ->disableOriginalConstructor()
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/DoctrineOrmTypeGuesserTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/DoctrineOrmTypeGuesserTest.php
index d2e101b4cd..226f94e993 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/DoctrineOrmTypeGuesserTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/DoctrineOrmTypeGuesserTest.php
@@ -11,7 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Form;
 
-use Doctrine\Common\Persistence\Mapping\ClassMetadata;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\ORM\Mapping\ClassMetadata;
+use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\ObjectManager;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\DoctrineOrmTypeGuesser;
 use Symfony\Component\Form\Guess\Guess;
@@ -83,10 +87,10 @@ class DoctrineOrmTypeGuesserTest extends TestCase
 
     private function getGuesser(ClassMetadata $classMetadata)
     {
-        $em = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectManager')->getMock();
+        $em = $this->getMockBuilder(interface_exists(ObjectManager::class) ? ObjectManager::class : LegacyObjectManager::class)->getMock();
         $em->expects($this->once())->method('getClassMetaData')->with('TestEntity')->willReturn($classMetadata);
 
-        $registry = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $registry = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
         $registry->expects($this->once())->method('getManagers')->willReturn([$em]);
 
         return new DoctrineOrmTypeGuesser($registry);
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
index 53be11f6d1..8293c36c77 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
@@ -11,7 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Form\Type;
 
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
 use Doctrine\ORM\Tools\SchemaTool;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Bridge\Doctrine\Form\DoctrineOrmExtension;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
@@ -34,7 +36,7 @@ class EntityTypePerformanceTest extends FormPerformanceTestCase
 
     protected function getExtensions()
     {
-        $manager = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $manager = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
 
         $manager->expects($this->any())
             ->method('getManager')
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
index 933b30cff3..5b50dc3058 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
@@ -12,10 +12,11 @@
 namespace Symfony\Bridge\Doctrine\Tests\Form\Type;
 
 use Doctrine\Common\Collections\ArrayCollection;
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\Tools\SchemaTool;
+use Doctrine\Persistence\ManagerRegistry;
 use PHPUnit\Framework\MockObject\MockObject;
 use Symfony\Bridge\Doctrine\Form\DoctrineOrmExtension;
 use Symfony\Bridge\Doctrine\Form\DoctrineOrmTypeGuesser;
@@ -1226,7 +1227,7 @@ class EntityTypeTest extends BaseTypeTest
 
     protected function createRegistryMock($name, $em)
     {
-        $registry = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $registry = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
         $registry->expects($this->any())
             ->method('getManager')
             ->with($this->equalTo($name))
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php b/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
index 5988aafefc..26a24b2e41 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
@@ -11,8 +11,13 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Security\User;
 
-use Doctrine\Common\Persistence\ObjectRepository;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Common\Persistence\ObjectRepository as LegacyObjectRepository;
 use Doctrine\ORM\Tools\SchemaTool;
+use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\ObjectManager;
+use Doctrine\Persistence\ObjectRepository;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Security\User\EntityUserProvider;
 use Symfony\Bridge\Doctrine\Security\User\UserLoaderInterface;
@@ -61,7 +66,7 @@ class EntityUserProviderTest extends TestCase
     {
         $user = new User(1, 1, 'user1');
 
-        $repository = $this->createMock([ObjectRepository::class, UserLoaderInterface::class]);
+        $repository = $this->createMock([interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class, UserLoaderInterface::class]);
         $repository
             ->expects($this->once())
             ->method('loadUserByUsername')
@@ -147,7 +152,7 @@ class EntityUserProviderTest extends TestCase
 
     public function testLoadUserByUserNameShouldLoadUserWhenProperInterfaceProvided()
     {
-        $repository = $this->createMock([ObjectRepository::class, UserLoaderInterface::class]);
+        $repository = $this->createMock([interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class, UserLoaderInterface::class]);
         $repository->expects($this->once())
             ->method('loadUserByUsername')
             ->with('name')
@@ -166,7 +171,7 @@ class EntityUserProviderTest extends TestCase
     public function testLoadUserByUserNameShouldDeclineInvalidInterface()
     {
         $this->expectException('InvalidArgumentException');
-        $repository = $this->createMock(ObjectRepository::class);
+        $repository = $this->createMock(interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class);
 
         $provider = new EntityUserProvider(
             $this->getManager($this->getObjectManager($repository)),
@@ -180,7 +185,7 @@ class EntityUserProviderTest extends TestCase
     {
         $user = new User(1, 1, 'user1');
 
-        $repository = $this->createMock([ObjectRepository::class, PasswordUpgraderInterface::class]);
+        $repository = $this->createMock([interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class, PasswordUpgraderInterface::class]);
         $repository->expects($this->once())
             ->method('upgradePassword')
             ->with($user, 'foobar');
@@ -195,7 +200,7 @@ class EntityUserProviderTest extends TestCase
 
     private function getManager($em, $name = null)
     {
-        $manager = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $manager = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
         $manager->expects($this->any())
             ->method('getManager')
             ->with($this->equalTo($name))
@@ -206,7 +211,7 @@ class EntityUserProviderTest extends TestCase
 
     private function getObjectManager($repository)
     {
-        $em = $this->getMockBuilder('\Doctrine\Common\Persistence\ObjectManager')
+        $em = $this->getMockBuilder(interface_exists(ObjectManager::class) ? ObjectManager::class : LegacyObjectManager::class)
             ->setMethods(['getClassMetadata', 'getRepository'])
             ->getMockForAbstractClass();
         $em->expects($this->any())
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
index fdf0b550ce..ecbc58da4e 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
@@ -12,11 +12,16 @@
 namespace Symfony\Bridge\Doctrine\Tests\Validator\Constraints;
 
 use Doctrine\Common\Collections\ArrayCollection;
-use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\ObjectManager;
-use Doctrine\Common\Persistence\ObjectRepository;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Common\Persistence\Mapping\ClassMetadata as LegacyClassMetadata;
+use Doctrine\Common\Persistence\ObjectManager as LegacyObjectManager;
+use Doctrine\Common\Persistence\ObjectRepository as LegacyObjectRepository;
 use Doctrine\DBAL\Types\Type;
 use Doctrine\ORM\Tools\SchemaTool;
+use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\Mapping\ClassMetadata;
+use Doctrine\Persistence\ObjectManager;
+use Doctrine\Persistence\ObjectRepository;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
 use Symfony\Bridge\Doctrine\Test\TestRepositoryFactory;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity;
@@ -76,9 +81,9 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
         parent::setUp();
     }
 
-    protected function createRegistryMock(ObjectManager $em = null)
+    protected function createRegistryMock($em = null)
     {
-        $registry = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $registry = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
         $registry->expects($this->any())
                  ->method('getManager')
                  ->with($this->equalTo(self::EM_NAME))
@@ -89,7 +94,7 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
 
     protected function createRepositoryMock()
     {
-        $repository = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectRepository')
+        $repository = $this->getMockBuilder(interface_exists(ObjectRepository::class) ? ObjectRepository::class : LegacyObjectRepository::class)
             ->setMethods(['findByCustom', 'find', 'findAll', 'findOneBy', 'findBy', 'getClassName'])
             ->getMock()
         ;
@@ -99,7 +104,7 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
 
     protected function createEntityManagerMock($repositoryMock)
     {
-        $em = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectManager')
+        $em = $this->getMockBuilder(interface_exists(ObjectManager::class) ? ObjectManager::class : LegacyObjectManager::class)
             ->getMock()
         ;
         $em->expects($this->any())
@@ -107,7 +112,7 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
             ->willReturn($repositoryMock)
         ;
 
-        $classMetadata = $this->getMockBuilder('Doctrine\Common\Persistence\Mapping\ClassMetadata')->getMock();
+        $classMetadata = $this->getMockBuilder(interface_exists(ClassMetadata::class) ? ClassMetadata::class : LegacyClassMetadata::class)->getMock();
         $classMetadata
             ->expects($this->any())
             ->method('hasField')
@@ -141,7 +146,7 @@ class UniqueEntityValidatorTest extends ConstraintValidatorTestCase
         return new UniqueEntityValidator($this->registry);
     }
 
-    private function createSchema(ObjectManager $em)
+    private function createSchema($em)
     {
         $schemaTool = new SchemaTool($em);
         $schemaTool->createSchema([
diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
index 312b84a71a..d6b9eb5de8 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
@@ -11,9 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Validator\Constraints;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\Mapping\ClassMetadata;
-use Doctrine\Common\Persistence\ObjectManager;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
@@ -28,7 +27,10 @@ class UniqueEntityValidator extends ConstraintValidator
 {
     private $registry;
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
@@ -78,7 +80,6 @@ class UniqueEntityValidator extends ConstraintValidator
         }
 
         $class = $em->getClassMetadata(\get_class($entity));
-        /* @var $class \Doctrine\Common\Persistence\Mapping\ClassMetadata */
 
         $criteria = [];
         $hasNullValue = false;
@@ -179,7 +180,7 @@ class UniqueEntityValidator extends ConstraintValidator
             ->addViolation();
     }
 
-    private function formatWithIdentifiers(ObjectManager $em, ClassMetadata $class, $value)
+    private function formatWithIdentifiers($em, $class, $value)
     {
         if (!\is_object($value) || $value instanceof \DateTimeInterface) {
             return $this->formatValue($value, self::PRETTY_DATE);
diff --git a/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php b/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
index 3b482565a8..e7f39b335b 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
@@ -11,7 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Validator;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\Validator\ObjectInitializerInterface;
 
 /**
@@ -23,7 +24,10 @@ class DoctrineInitializer implements ObjectInitializerInterface
 {
     protected $registry;
 
-    public function __construct(ManagerRegistry $registry)
+    /**
+     * @param ManagerRegistry|LegacyManagerRegistry $registry
+     */
+    public function __construct($registry)
     {
         $this->registry = $registry;
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php b/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
index e56fcf2b28..d8fb1b0341 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
@@ -11,7 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Controller;
 
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Psr\Container\ContainerInterface;
 use Psr\Link\LinkInterface;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
@@ -94,7 +95,7 @@ abstract class AbstractController implements ServiceSubscriberInterface
             'session' => '?'.SessionInterface::class,
             'security.authorization_checker' => '?'.AuthorizationCheckerInterface::class,
             'twig' => '?'.Environment::class,
-            'doctrine' => '?'.ManagerRegistry::class,
+            'doctrine' => '?'.(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class),
             'form.factory' => '?'.FormFactoryInterface::class,
             'security.token_storage' => '?'.TokenStorageInterface::class,
             'security.csrf.token_manager' => '?'.CsrfTokenManagerInterface::class,
@@ -337,9 +338,11 @@ abstract class AbstractController implements ServiceSubscriberInterface
     /**
      * Shortcut to return the Doctrine Registry service.
      *
+     * @return ManagerRegistry|LegacyManagerRegistry
+     *
      * @throws \LogicException If DoctrineBundle is not available
      */
-    protected function getDoctrine(): ManagerRegistry
+    protected function getDoctrine()
     {
         if (!$this->container->has('doctrine')) {
             throw new \LogicException('The DoctrineBundle is not registered in your application. Try running "composer require symfony/orm-pack".');
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
index ca1d7ef011..bea1d7188d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Controller;
 
+use Doctrine\Common\Persistence\ManagerRegistry as LegacyManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
@@ -53,7 +55,7 @@ class AbstractControllerTest extends TestCase
             'session' => '?Symfony\\Component\\HttpFoundation\\Session\\SessionInterface',
             'security.authorization_checker' => '?Symfony\\Component\\Security\\Core\\Authorization\\AuthorizationCheckerInterface',
             'twig' => '?Twig\\Environment',
-            'doctrine' => '?Doctrine\\Common\\Persistence\\ManagerRegistry',
+            'doctrine' => '?'.(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class),
             'form.factory' => '?Symfony\\Component\\Form\\FormFactoryInterface',
             'parameter_bag' => '?Symfony\\Component\\DependencyInjection\\ParameterBag\\ContainerBagInterface',
             'message_bus' => '?Symfony\\Component\\Messenger\\MessageBusInterface',
@@ -532,7 +534,7 @@ class AbstractControllerTest extends TestCase
 
     public function testGetDoctrine()
     {
-        $doctrine = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
+        $doctrine = $this->getMockBuilder(interface_exists(ManagerRegistry::class) ? ManagerRegistry::class : LegacyManagerRegistry::class)->getMock();
 
         $container = new Container();
         $container->set('doctrine', $doctrine);
diff --git a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
index 78a65e9d6d..a2fc8e7a34 100644
--- a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
@@ -61,14 +61,15 @@ class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
         $this->adapterCount = \count($this->adapters);
 
         $this->syncItem = \Closure::bind(
-            static function ($sourceItem, $item) use ($defaultLifetime) {
-                $item->value = $sourceItem->value;
-                $item->expiry = $sourceItem->expiry;
-                $item->isHit = $sourceItem->isHit;
-                $item->metadata = $sourceItem->metadata;
-
+            static function ($sourceItem, $item, $sourceMetadata = null) use ($defaultLifetime) {
                 $sourceItem->isTaggable = false;
-                unset($sourceItem->metadata[CacheItem::METADATA_TAGS]);
+                $sourceMetadata = $sourceMetadata ?? $sourceItem->metadata;
+                unset($sourceMetadata[CacheItem::METADATA_TAGS]);
+
+                $item->value = $sourceItem->value;
+                $item->expiry = $sourceMetadata[CacheItem::METADATA_EXPIRY] ?? $sourceItem->expiry;
+                $item->isHit = $sourceItem->isHit;
+                $item->metadata = $item->newMetadata = $sourceItem->metadata = $sourceMetadata;
 
                 if (0 < $sourceItem->defaultLifetime && $sourceItem->defaultLifetime < $defaultLifetime) {
                     $defaultLifetime = $sourceItem->defaultLifetime;
@@ -103,7 +104,7 @@ class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
                 $value = $this->doGet($adapter, $key, $callback, $beta, $metadata);
             }
             if (null !== $item) {
-                ($this->syncItem)($lastItem = $lastItem ?? $item, $item);
+                ($this->syncItem)($lastItem = $lastItem ?? $item, $item, $metadata);
             }
 
             return $value;
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
index ffd598bc04..99b38834f8 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
@@ -28,7 +28,7 @@ class ChainAdapterTest extends AdapterTestCase
     public function createCachePool(int $defaultLifetime = 0, string $testMethod = null): CacheItemPoolInterface
     {
         if ('testGetMetadata' === $testMethod) {
-            return new ChainAdapter([new FilesystemAdapter('', $defaultLifetime)], $defaultLifetime);
+            return new ChainAdapter([new FilesystemAdapter('a', $defaultLifetime), new FilesystemAdapter('b', $defaultLifetime)], $defaultLifetime);
         }
 
         return new ChainAdapter([new ArrayAdapter($defaultLifetime), new ExternalAdapter(), new FilesystemAdapter('', $defaultLifetime)], $defaultLifetime);
diff --git a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/CallTrait.php b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/CallTrait.php
index 39c5ecc7d8..28f92d274f 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/CallTrait.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/CallTrait.php
@@ -18,16 +18,17 @@ trait CallTrait
     /**
      * Adds a method to call after service initialization.
      *
-     * @param string $method    The method name to call
-     * @param array  $arguments An array of arguments to pass to the method call
+     * @param string $method       The method name to call
+     * @param array  $arguments    An array of arguments to pass to the method call
+     * @param bool   $returnsClone Whether the call returns the service instance or not
      *
      * @return $this
      *
      * @throws InvalidArgumentException on empty $method param
      */
-    final public function call(string $method, array $arguments = []): self
+    final public function call(string $method, array $arguments = [], bool $returnsClone = false): self
     {
-        $this->definition->addMethodCall($method, static::processValue($arguments, true));
+        $this->definition->addMethodCall($method, static::processValue($arguments, true), $returnsClone);
 
         return $this;
     }
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index 1ab74d7edf..21cb15744e 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1557,20 +1557,17 @@ class Request
      */
     public function getPreferredFormat(?string $default = 'html'): ?string
     {
-        if (null !== $this->preferredFormat) {
+        if (null !== $this->preferredFormat || null !== $this->preferredFormat = $this->getRequestFormat(null)) {
             return $this->preferredFormat;
         }
 
-        $preferredFormat = null;
-        foreach ($this->getAcceptableContentTypes() as $contentType) {
-            if ($preferredFormat = $this->getFormat($contentType)) {
-                break;
+        foreach ($this->getAcceptableContentTypes() as $mimeType) {
+            if ($this->preferredFormat = $this->getFormat($mimeType)) {
+                return $this->preferredFormat;
             }
         }
 
-        $this->preferredFormat = $this->getRequestFormat($preferredFormat ?: $this->getContentType());
-
-        return $this->preferredFormat ?: $default;
+        return $default;
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
index 28595c1e7a..3c206f9f0a 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
@@ -408,12 +408,10 @@ class RequestTest extends TestCase
 
         $request->setRequestFormat('atom');
         $request->headers->set('Accept', 'application/ld+json');
-        $request->headers->set('Content-Type', 'application/merge-patch+json');
         $this->assertSame('atom', $request->getPreferredFormat());
 
         $request = new Request();
         $request->headers->set('Accept', 'application/xml');
-        $request->headers->set('Content-Type', 'application/json');
         $this->assertSame('xml', $request->getPreferredFormat());
 
         $request = new Request();
diff --git a/src/Symfony/Component/Routing/Router.php b/src/Symfony/Component/Routing/Router.php
index 7057f9c201..031749b360 100644
--- a/src/Symfony/Component/Routing/Router.php
+++ b/src/Symfony/Component/Routing/Router.php
@@ -92,6 +92,8 @@ class Router implements RouterInterface, RequestMatcherInterface
      */
     private $expressionLanguageProviders = [];
 
+    private static $cache = [];
+
     /**
      * @param mixed $resource The main resource to load
      */
@@ -295,7 +297,7 @@ class Router implements RouterInterface, RequestMatcherInterface
             }
         );
 
-        return $this->matcher = new $this->options['matcher_class'](require $cache->getPath(), $this->context);
+        return $this->matcher = new $this->options['matcher_class'](self::getCompiledRoutes($cache->getPath()), $this->context);
     }
 
     /**
@@ -325,7 +327,7 @@ class Router implements RouterInterface, RequestMatcherInterface
                 }
             );
 
-            $this->generator = new $this->options['generator_class'](require $cache->getPath(), $this->context, $this->logger, $this->defaultLocale);
+            $this->generator = new $this->options['generator_class'](self::getCompiledRoutes($cache->getPath()), $this->context, $this->logger, $this->defaultLocale);
         }
 
         if ($this->generator instanceof ConfigurableRequirementsInterface) {
@@ -368,4 +370,21 @@ class Router implements RouterInterface, RequestMatcherInterface
 
         return $this->configCacheFactory;
     }
+
+    private static function getCompiledRoutes(string $path): array
+    {
+        if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN) && (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) || filter_var(ini_get('opcache.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
+            self::$cache = null;
+        }
+
+        if (null === self::$cache) {
+            return require $path;
+        }
+
+        if (isset(self::$cache[$path])) {
+            return self::$cache[$path];
+        }
+
+        return self::$cache[$path] = require $path;
+    }
 }
diff --git a/src/Symfony/Component/Translation/Loader/PhpFileLoader.php b/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
index a0050e8db1..0991c3d3a2 100644
--- a/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/PhpFileLoader.php
@@ -18,11 +18,25 @@ namespace Symfony\Component\Translation\Loader;
  */
 class PhpFileLoader extends FileLoader
 {
+    private static $cache = [];
+
     /**
      * {@inheritdoc}
      */
     protected function loadResource($resource)
     {
-        return require $resource;
+        if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN) && (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) || filter_var(ini_get('opcache.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
+            self::$cache = null;
+        }
+
+        if (null === self::$cache) {
+            return require $resource;
+        }
+
+        if (isset(self::$cache[$resource])) {
+            return self::$cache[$resource];
+        }
+
+        return self::$cache[$resource] = require $resource;
     }
 }
diff --git a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
index 8e9502dfa5..56b2384079 100644
--- a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
@@ -46,6 +46,7 @@ abstract class AbstractCloner implements ClonerInterface
         'Doctrine\Common\Proxy\Proxy' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castCommonProxy'],
         'Doctrine\ORM\Proxy\Proxy' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castOrmProxy'],
         'Doctrine\ORM\PersistentCollection' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castPersistentCollection'],
+        'Doctrine\Persistence\ObjectManager' => ['Symfony\Component\VarDumper\Caster\StubCaster', 'cutInternals'],
 
         'DOMException' => ['Symfony\Component\VarDumper\Caster\DOMCaster', 'castException'],
         'DOMStringList' => ['Symfony\Component\VarDumper\Caster\DOMCaster', 'castLength'],