diff --git a/Command/AboutCommand.php b/Command/AboutCommand.php
index cf3e946f6..0ca4172de 100644
--- a/Command/AboutCommand.php
+++ b/Command/AboutCommand.php
@@ -54,7 +54,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -100,6 +100,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->table([], $rows);
+
+        return 0;
     }
 
     private static function formatPath(string $path, string $baseDir): string
diff --git a/Command/CacheClearCommand.php b/Command/CacheClearCommand.php
index 24aa8171c..6711e456b 100644
--- a/Command/CacheClearCommand.php
+++ b/Command/CacheClearCommand.php
@@ -72,7 +72,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $fs = $this->filesystem;
         $io = new SymfonyStyle($input, $output);
@@ -175,6 +175,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->success(sprintf('Cache for the "%s" environment (debug=%s) was successfully cleared.', $kernel->getEnvironment(), var_export($kernel->isDebug(), true)));
+
+        return 0;
     }
 
     private function warmup(string $warmupDir, string $realCacheDir, bool $enableOptionalWarmers = true)
diff --git a/Command/CachePoolClearCommand.php b/Command/CachePoolClearCommand.php
index dc42910d3..50aacd9bb 100644
--- a/Command/CachePoolClearCommand.php
+++ b/Command/CachePoolClearCommand.php
@@ -60,7 +60,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $kernel = $this->getApplication()->getKernel();
@@ -99,5 +99,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->success('Cache was successfully cleared.');
+
+        return 0;
     }
 }
diff --git a/Command/CachePoolDeleteCommand.php b/Command/CachePoolDeleteCommand.php
index 656f9a9de..2a7a2fe51 100644
--- a/Command/CachePoolDeleteCommand.php
+++ b/Command/CachePoolDeleteCommand.php
@@ -59,7 +59,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $pool = $input->getArgument('pool');
@@ -69,7 +69,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         if (!$cachePool->hasItem($key)) {
             $io->note(sprintf('Cache item "%s" does not exist in cache pool "%s".', $key, $pool));
 
-            return;
+            return 0;
         }
 
         if (!$cachePool->deleteItem($key)) {
@@ -77,5 +77,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->success(sprintf('Cache item "%s" was successfully deleted.', $key));
+
+        return 0;
     }
 }
diff --git a/Command/CachePoolListCommand.php b/Command/CachePoolListCommand.php
index 4f399ab61..7b725411d 100644
--- a/Command/CachePoolListCommand.php
+++ b/Command/CachePoolListCommand.php
@@ -51,12 +51,14 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
         $io->table(['Pool name'], array_map(function ($pool) {
             return [$pool];
         }, $this->poolNames));
+
+        return 0;
     }
 }
diff --git a/Command/CachePoolPruneCommand.php b/Command/CachePoolPruneCommand.php
index 74b530637..65f3ff6b5 100644
--- a/Command/CachePoolPruneCommand.php
+++ b/Command/CachePoolPruneCommand.php
@@ -57,7 +57,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -67,5 +67,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->success('Successfully pruned cache pool(s).');
+
+        return 0;
     }
 }
diff --git a/Command/CacheWarmupCommand.php b/Command/CacheWarmupCommand.php
index 04b5d2f7c..0a87acf26 100644
--- a/Command/CacheWarmupCommand.php
+++ b/Command/CacheWarmupCommand.php
@@ -66,7 +66,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -80,5 +80,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $this->cacheWarmer->warmUp($kernel->getContainer()->getParameter('kernel.cache_dir'));
 
         $io->success(sprintf('Cache for the "%s" environment (debug=%s) was successfully warmed.', $kernel->getEnvironment(), var_export($kernel->isDebug(), true)));
+
+        return 0;
     }
 }
diff --git a/Command/ConfigDebugCommand.php b/Command/ConfigDebugCommand.php
index 4761b66ad..2aa631eb7 100644
--- a/Command/ConfigDebugCommand.php
+++ b/Command/ConfigDebugCommand.php
@@ -63,7 +63,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $errorIo = $io->getErrorStyle();
@@ -73,7 +73,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $errorIo->comment('Provide the name of a bundle as the first argument of this command to dump its configuration. (e.g. <comment>debug:config FrameworkBundle</comment>)');
             $errorIo->comment('For dumping a specific option, add its path as the second argument of this command. (e.g. <comment>debug:config FrameworkBundle serializer</comment> to dump the <comment>framework.serializer</comment> configuration)');
 
-            return;
+            return 0;
         }
 
         $extension = $this->findExtension($name);
@@ -101,7 +101,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
             $io->writeln(Yaml::dump([$extensionAlias => $config], 10));
 
-            return;
+            return 0;
         }
 
         try {
@@ -109,12 +109,14 @@ protected function execute(InputInterface $input, OutputInterface $output)
         } catch (LogicException $e) {
             $errorIo->error($e->getMessage());
 
-            return;
+            return 1;
         }
 
         $io->title(sprintf('Current configuration for "%s.%s"', $extensionAlias, $path));
 
         $io->writeln(Yaml::dump($config, 10));
+
+        return 0;
     }
 
     private function compileContainer(): ContainerBuilder
diff --git a/Command/ContainerDebugCommand.php b/Command/ContainerDebugCommand.php
index 8578462ab..13d62b383 100644
--- a/Command/ContainerDebugCommand.php
+++ b/Command/ContainerDebugCommand.php
@@ -113,7 +113,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $errorIo = $io->getErrorStyle();
@@ -179,6 +179,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 $errorIo->comment('To search for a specific service, re-run this command with a search term. (e.g. <comment>debug:container log</comment>)');
             }
         }
+
+        return 0;
     }
 
     /**
diff --git a/Command/EventDispatcherDebugCommand.php b/Command/EventDispatcherDebugCommand.php
index e61f543e7..ad49cdeea 100644
--- a/Command/EventDispatcherDebugCommand.php
+++ b/Command/EventDispatcherDebugCommand.php
@@ -69,7 +69,7 @@ protected function configure()
      *
      * @throws \LogicException
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -78,7 +78,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             if (!$this->dispatcher->hasListeners($event)) {
                 $io->getErrorStyle()->warning(sprintf('The event "%s" does not have any registered listeners.', $event));
 
-                return;
+                return 0;
             }
 
             $options = ['event' => $event];
@@ -89,5 +89,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $options['raw_text'] = $input->getOption('raw');
         $options['output'] = $io;
         $helper->describe($io, $this->dispatcher, $options);
+
+        return 0;
     }
 }
diff --git a/Command/RouterDebugCommand.php b/Command/RouterDebugCommand.php
index bad3fa059..9724e5122 100644
--- a/Command/RouterDebugCommand.php
+++ b/Command/RouterDebugCommand.php
@@ -73,7 +73,7 @@ protected function configure()
      *
      * @throws InvalidArgumentException When route does not exist
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
         $name = $input->getArgument('name');
@@ -105,6 +105,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 'output' => $io,
             ]);
         }
+
+        return 0;
     }
 
     private function findRouteNameContaining(string $name, RouteCollection $routes): array
diff --git a/Command/TranslationDebugCommand.php b/Command/TranslationDebugCommand.php
index 4ecf58be8..24290a43c 100644
--- a/Command/TranslationDebugCommand.php
+++ b/Command/TranslationDebugCommand.php
@@ -117,7 +117,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -191,7 +191,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
             $io->getErrorStyle()->warning($outputMessage);
 
-            return;
+            return 0;
         }
 
         // Load the fallback catalogues
@@ -240,6 +240,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $io->table($headers, $rows);
+
+        return 0;
     }
 
     private function formatState(int $state): string
diff --git a/Command/WorkflowDumpCommand.php b/Command/WorkflowDumpCommand.php
index ff91dc781..cec930da1 100644
--- a/Command/WorkflowDumpCommand.php
+++ b/Command/WorkflowDumpCommand.php
@@ -59,7 +59,7 @@ protected function configure()
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $container = $this->getApplication()->getKernel()->getContainer();
         $serviceId = $input->getArgument('name');
@@ -97,5 +97,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             ],
         ];
         $output->writeln($dumper->dump($workflow->getDefinition(), $marking, $options));
+
+        return 0;
     }
 }
diff --git a/Resources/config/annotations.xml b/Resources/config/annotations.xml
index 05dffbc29..0ce6bf659 100644
--- a/Resources/config/annotations.xml
+++ b/Resources/config/annotations.xml
@@ -36,7 +36,7 @@
         <service id="annotations.cache_warmer" class="Symfony\Bundle\FrameworkBundle\CacheWarmer\AnnotationsCacheWarmer">
             <argument type="service" id="annotations.reader" />
             <argument>%kernel.cache_dir%/annotations.php</argument>
-            <argument>#^Symfony\\(?:Component\\HttpKernel\\|Bundle\\FrameworkBundle\\Controller\\(?!AbstractController$|Controller$))#</argument>
+            <argument>#^Symfony\\(?:Component\\HttpKernel\\|Bundle\\FrameworkBundle\\Controller\\(?!.*Controller$))#</argument>
             <argument>%kernel.debug%</argument>
         </service>
 
diff --git a/composer.json b/composer.json
index 52da5d095..24c8a642d 100644
--- a/composer.json
+++ b/composer.json
@@ -83,6 +83,7 @@
         "symfony/twig-bridge": "<4.4",
         "symfony/twig-bundle": "<4.4",
         "symfony/validator": "<4.4",
+        "symfony/var-dumper": "<4.4",
         "symfony/workflow": "<4.4"
     },
     "suggest": {