symfony
diff --git a/‎src/Symfony/Component/Serializer/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Serializer/Encoder/SerializerAwareEncoder.php
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diff --git a/‎src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
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diff --git a/‎src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
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diff --git a/‎src/Symfony/Component/Serializer/Normalizer/SerializerAwareNormalizer.php
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diff --git a/‎src/Symfony/Component/Serializer/Serializer.php
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@@ -1,6 +1,14 @@
 CHANGELOG
 =========
 
+4.0.0
+-----
+
+ * removed the `SerializerAwareEncoder` and `SerializerAwareNormalizer` classes,
+   use the `SerializerAwareTrait` instead
+ * removed the `Serializer::$normalizerCache` and `Serializer::$denormalizerCache`
+   properties
+
 3.3.0
 -----
 
 
@@ -12,6 +12,8 @@
 namespace Symfony\Component\Serializer\Encoder;
 
 use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+use Symfony\Component\Serializer\SerializerAwareInterface;
+use Symfony\Component\Serializer\SerializerAwareTrait;
 
 /**
  * Encodes XML data.
@@ -21,8 +23,10 @@
  * @author Fabian Vogler <fabian@equivalence.ch>
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-class XmlEncoder extends SerializerAwareEncoder implements EncoderInterface, DecoderInterface, NormalizationAwareInterface
+class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwareInterface, SerializerAwareInterface
 {
+    use SerializerAwareTrait;
+
     const FORMAT = 'xml';
 
     /**
 
@@ -19,14 +19,17 @@
 use Symfony\Component\Serializer\Mapping\AttributeMetadataInterface;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 use Symfony\Component\Serializer\SerializerAwareInterface;
+use Symfony\Component\Serializer\SerializerAwareTrait;
 
 /**
  * Normalizer implementation.
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-abstract class AbstractNormalizer extends SerializerAwareNormalizer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface
+abstract class AbstractNormalizer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface
 {
+    use SerializerAwareTrait;
+
     const CIRCULAR_REFERENCE_LIMIT = 'circular_reference_limit';
     const OBJECT_TO_POPULATE = 'object_to_populate';
     const GROUPS = 'groups';
 
@@ -54,20 +54,6 @@ class Serializer implements SerializerInterface, NormalizerInterface, Denormaliz
      */
     protected $normalizers = array();
 
-    /**
-     * @var array
-     *
-     * @deprecated since 3.1 will be removed in 4.0
-     */
-    protected $normalizerCache = array();
-
-    /**
-     * @var array
-     *
-     * @deprecated since 3.1 will be removed in 4.0
-     */
-    protected $denormalizerCache = array();
-
     public function __construct(array $normalizers = array(), array $encoders = array())
     {
         foreach ($normalizers as $normalizer) {