%kernel.cache_dir%/serialization.php null null %serializer.mapping.cache.file% %serializer.mapping.cache.file% %serializer.mapping.cache.prefix% The "%service_id%" service is deprecated since Symfony 3.2 and will be removed in 4.0. APCu should now be automatically used when available. The "%service_id%" service is deprecated since Symfony 3.1 and will be removed in 4.0. APCu should now be automatically used when available.