diff --git a/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetManagerCacheWarmer.php b/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetManagerCacheWarmer.php
index 35e7e8dc67..f86d6fc421 100644
--- a/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetManagerCacheWarmer.php
+++ b/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetManagerCacheWarmer.php
@@ -11,10 +11,15 @@
 
 namespace Symfony\Bundle\AsseticBundle\CacheWarmer;
 
-use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmer;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class AssetManagerCacheWarmer extends CacheWarmer
+/**
+ * The AssetManagerCacheWarmer warms up the formula loader.
+ *
+ * @author Kris Wallsmith <kris.wallsmith@symfony.com>
+ */
+class AssetManagerCacheWarmer implements CacheWarmerInterface
 {
     private $container;
 
diff --git a/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetWriterCacheWarmer.php b/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetWriterCacheWarmer.php
index 298ffd235d..1242d7cb89 100644
--- a/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetWriterCacheWarmer.php
+++ b/src/Symfony/Bundle/AsseticBundle/CacheWarmer/AssetWriterCacheWarmer.php
@@ -12,10 +12,15 @@
 namespace Symfony\Bundle\AsseticBundle\CacheWarmer;
 
 use Assetic\AssetWriter;
-use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmer;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class AssetWriterCacheWarmer extends CacheWarmer
+/**
+ * The AssetWriterCacheWarmer processes and writes the asset files.
+ * 
+ * @author Kris Wallsmith <kris.wallsmith@symfony.com>
+ */
+class AssetWriterCacheWarmer implements CacheWarmerInterface
 {
     private $container;
     private $writer;
diff --git a/src/Symfony/Bundle/AsseticBundle/Factory/Resource/FileResource.php b/src/Symfony/Bundle/AsseticBundle/Factory/Resource/FileResource.php
index a06e425e03..d089d40fb8 100644
--- a/src/Symfony/Bundle/AsseticBundle/Factory/Resource/FileResource.php
+++ b/src/Symfony/Bundle/AsseticBundle/Factory/Resource/FileResource.php
@@ -23,11 +23,9 @@ use Symfony\Component\Templating\Loader\LoaderInterface;
 class FileResource implements ResourceInterface
 {
     protected $loader;
-    protected $parser;
     protected $bundle;
     protected $baseDir;
     protected $path;
-
     protected $template;
 
     /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
index 00e788e62a..d24478626e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\CacheWarmer;
 
-use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmer;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 use Symfony\Component\Routing\Router;
 
 /**
@@ -19,7 +19,7 @@ use Symfony\Component\Routing\Router;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class RouterCacheWarmer extends CacheWarmer
+class RouterCacheWarmer implements CacheWarmerInterface
 {
     protected $router;
 
diff --git a/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php b/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
index 0758c75c6c..15cb5d40db 100644
--- a/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
+++ b/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Bundle\TwigBundle\CacheWarmer;
 
-use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmer;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Finder\Finder;
 
@@ -23,7 +23,7 @@ use Symfony\Component\Finder\Finder;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class TemplateCacheCacheWarmer extends CacheWarmer
+class TemplateCacheCacheWarmer implements CacheWarmerInterface
 {
     protected $container;
     protected $parser;