symfony
diff --git a/‎src/Symfony/Component/HttpKernel/Bundle/SimpleBundle.php
Lines changed: 25 additions & 13 deletions b/‎src/Symfony/Component/HttpKernel/Bundle/SimpleBundle.php
Lines changed: 25 additions & 13 deletions
@@ -11,15 +11,14 @@
 
 namespace Symfony\Component\HttpKernel\Bundle;
 
-use Symfony\Component\Config\Definition\Builder\NodeParentInterface;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 /**
- * A all-in-one implementation of {@link BundleInterface},
- * {@link ExtensionInterface} and {@link ConfigurationInterface}.
+ * An implementation of a simple all-in-one {@link BundleInterface} and
+ * configurable {@link Extension}.
  *
  * @author Guilhem N. <egetick@gmail.com>
  */
@@ -30,9 +29,11 @@ abstract class SimpleBundle extends Bundle implements ConfigurationInterface
      */
     final public function getContainerExtension()
     {
-        return new SimpleExtension($this, function (array $config, ContainerBuilder $container) {
-            $this->buildContainer($config, $container);
-        });
+        if (null === $this->extension) {
+            $this->extension = new SimpleExtension($this);
+        }
+
+        return $this->extension;
     }
 
     /**
@@ -41,14 +42,14 @@ final public function getContainerExtension()
     final public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root($this->getAlias());
+        $rootNode = $treeBuilder->root($this->getContainerExtension()->getAlias());
 
         $this->buildConfiguration($rootNode);
 
         return $treeBuilder;
     }
 
-    protected function buildConfiguration(NodeParentInterface $rootNode)
+    protected function buildConfiguration(TreeBuilder $rootNode)
     {
     }
 
@@ -58,19 +59,28 @@ protected function buildContainer(array $config, ContainerBuilder $container)
 }
 
 /**
- * Simple {@link ExtensionInterface} supporting {@link MicroBundle}.
+ * Simple {@link Extension} supporting {@link SimpleBundle}.
  *
  * @internal
  */
 final class SimpleExtension extends Extension
 {
     private $bundle;
-    private $buildContainer;
 
-    public function __construct(SimpleBundle $bundle, Closure $buildContainer)
+    public function __construct(SimpleBundle $bundle)
     {
         $this->bundle = $bundle;
-        $this->buildContainer = $buildContainer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAlias()
+    {
+        // check naming convention
+        $basename = preg_replace('/Bundle$/', '', $this->bundle->getName());
+
+        return Container::underscore($basename);
     }
 
     /**
@@ -80,7 +90,9 @@ public function load(array $configs, ContainerBuilder $container)
     {
         $config = $this->processConfiguration($this->bundle, $configs);
 
-        $f = $this->buildContainer;
+        $f = Closure::bind(function (array $config, ContainerBuilder $container) {
+            $this->buildContainer($config, $container);
+        }, $bundle, SimpleBundle::class);
         $f($config, $container);
     }