diff --git a/lib/Alchemy/Phrasea/Core/Service/Cache/ApcCache.php b/lib/Alchemy/Phrasea/Core/Service/Cache/ApcCache.php
index 26207697da..af531e95d7 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Cache/ApcCache.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Cache/ApcCache.php
@@ -23,7 +23,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class ApcCache extends ServiceAbstract implements ServiceInterface
+class ApcCache extends ServiceAbstract
 {
 
   protected $cache;
diff --git a/lib/Alchemy/Phrasea/Core/Service/Cache/ArrayCache.php b/lib/Alchemy/Phrasea/Core/Service/Cache/ArrayCache.php
index cae2c51c80..1bdfe6f562 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Cache/ArrayCache.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Cache/ArrayCache.php
@@ -24,7 +24,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class ArrayCache extends ServiceAbstract implements ServiceInterface
+class ArrayCache extends ServiceAbstract
 {
 
   protected $cache;
diff --git a/lib/Alchemy/Phrasea/Core/Service/Cache/MemcacheCache.php b/lib/Alchemy/Phrasea/Core/Service/Cache/MemcacheCache.php
index 1eab95aaea..a0f2c73cf6 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Cache/MemcacheCache.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Cache/MemcacheCache.php
@@ -23,7 +23,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class MemcacheCache extends ServiceAbstract implements ServiceInterface
+class MemcacheCache extends ServiceAbstract
 {
 
   const DEFAULT_HOST = "localhost";
diff --git a/lib/Alchemy/Phrasea/Core/Service/Cache/RedisCache.php b/lib/Alchemy/Phrasea/Core/Service/Cache/RedisCache.php
index 934efd25e9..e7eb64429e 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Cache/RedisCache.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Cache/RedisCache.php
@@ -23,7 +23,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class RedisCache extends ServiceAbstract implements ServiceInterface
+class RedisCache extends ServiceAbstract
 {
 
   const DEFAULT_HOST = "localhost";
diff --git a/lib/Alchemy/Phrasea/Core/Service/Cache/XcacheCache.php b/lib/Alchemy/Phrasea/Core/Service/Cache/XcacheCache.php
index 72e5ef85e1..3fbea9eab7 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Cache/XcacheCache.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Cache/XcacheCache.php
@@ -23,7 +23,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class XcacheCache extends ServiceAbstract implements ServiceInterface
+class XcacheCache extends ServiceAbstract
 {
 
   protected $cache;
diff --git a/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Monolog.php b/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Monolog.php
index b631f9a7bc..d79bfa1680 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Monolog.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Monolog.php
@@ -24,7 +24,7 @@ use Doctrine\Logger\MonologSQLLogger;
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class Monolog extends ParentLog implements ServiceInterface
+class Monolog extends ParentLog
 {
 
   const JSON_OUTPUT = 'json';
diff --git a/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Phpecho.php b/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Phpecho.php
index 4432bbe51c..88960da354 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Phpecho.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Log/Doctrine/Phpecho.php
@@ -23,7 +23,7 @@ use Doctrine\DBAL\Logging\EchoSQLLogger;
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class Phpecho extends ServiceAbstract implements ServiceInterface
+class Phpecho extends ServiceAbstract
 {
 
   public function getDriver()
diff --git a/lib/Alchemy/Phrasea/Core/Service/Log/FirePHP.php b/lib/Alchemy/Phrasea/Core/Service/Log/FirePHP.php
index daf20f88f9..12456141a8 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Log/FirePHP.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Log/FirePHP.php
@@ -24,7 +24,7 @@ use Monolog\Handler\FirePHPHandler;
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class FirePHP extends ServiceAbstract implements ServiceInterface
+class FirePHP extends ServiceAbstract
 {
 
   protected $logger;
diff --git a/lib/Alchemy/Phrasea/Core/Service/Log/Monolog.php b/lib/Alchemy/Phrasea/Core/Service/Log/Monolog.php
index aec9ec2656..69f7029b33 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Log/Monolog.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Log/Monolog.php
@@ -22,7 +22,7 @@ use Alchemy\Phrasea\Core,
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class Monolog extends ServiceAbstract implements ServiceInterface
+class Monolog extends ServiceAbstract
 {
   const DEFAULT_MAX_DAY = 10;
 
diff --git a/lib/Alchemy/Phrasea/Core/Service/Orm/Doctrine.php b/lib/Alchemy/Phrasea/Core/Service/Orm/Doctrine.php
index f4aafbdc73..75f98e1b6c 100644
--- a/lib/Alchemy/Phrasea/Core/Service/Orm/Doctrine.php
+++ b/lib/Alchemy/Phrasea/Core/Service/Orm/Doctrine.php
@@ -24,7 +24,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-class Doctrine extends ServiceAbstract implements ServiceInterface
+class Doctrine extends ServiceAbstract
 {
 
   protected $loggers = array(
diff --git a/lib/Alchemy/Phrasea/Core/Service/ServiceAbstract.php b/lib/Alchemy/Phrasea/Core/Service/ServiceAbstract.php
index 954dc4cc17..3eb8832869 100644
--- a/lib/Alchemy/Phrasea/Core/Service/ServiceAbstract.php
+++ b/lib/Alchemy/Phrasea/Core/Service/ServiceAbstract.php
@@ -20,7 +20,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  * @license     http://opensource.org/licenses/gpl-3.0 GPLv3
  * @link        www.phraseanet.com
  */
-abstract class ServiceAbstract
+abstract class ServiceAbstract implements ServiceInterface
 {
 
   protected $core;
diff --git a/lib/Alchemy/Phrasea/Core/Service/TemplateEngine/Twig.php b/lib/Alchemy/Phrasea/Core/Service/TemplateEngine/Twig.php
index 6b2c20ff35..78cccb4523 100644
--- a/lib/Alchemy/Phrasea/Core/Service/TemplateEngine/Twig.php
+++ b/lib/Alchemy/Phrasea/Core/Service/TemplateEngine/Twig.php
@@ -16,7 +16,7 @@ use Alchemy\Phrasea\Core,
     Alchemy\Phrasea\Core\Service\ServiceAbstract,
     Alchemy\Phrasea\Core\Service\ServiceInterface;
 
-class Twig extends ServiceAbstract implements ServiceInterface
+class Twig extends ServiceAbstract
 {
 
   /**