Do not activate the cache if Doctrine's cache is not present

Author: sroze

DependencyInjection/Configuration.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection;
 
 use Doctrine\Common\Annotations\Annotation;
+use Doctrine\Common\Cache\Cache;
 use Symfony\Bundle\FullStack;
 use Symfony\Component\Asset\Package;
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
@@ -741,7 +742,7 @@ private function addAnnotationsSection(ArrayNodeDefinition $rootNode)
                     ->info('annotation configuration')
                     ->{class_exists(Annotation::class) ? 'canBeDisabled' : 'canBeEnabled'}()
                     ->children()
-                        ->scalarNode('cache')->defaultValue('php_array')->end()
+                        ->scalarNode('cache')->defaultValue(interface_exists(Cache::class) ? 'php_array' : 'none')->end()
                         ->scalarNode('file_cache_dir')->defaultValue('%kernel.cache_dir%/annotations')->end()
                         ->booleanNode('debug')->defaultValue($this->debug)->end()
                     ->end()