Merge branch '4.3' into 4.4

* 4.3:
  fix merge
  CS
  [Serializer] Skip uninitialized (PHP 7.4) properties in PropertyNormalizer and ObjectNormalizer
  stop using deprecated Doctrine persistence classes
  [Cache] Fix wrong classname in deprecation message
  Fix regex lookahead syntax in ApplicationTest
  Fixed syntax in comment
  [SecurityBundle][FirewallMap] Remove unused property
  [Messenger][AMQP] Use delivery_mode=2 by default
  [DI] Improve performance of processDefinition
  Fix invalid Windows path normalization
  [Validator][ConstraintValidator] Safe fail on invalid timezones
  [DoctrineBridge] Fixed submitting invalid ids when using queries with limit
  [FrameworkBundle] Add info & example to auto_mapping config
  fix comparisons with null values at property paths

Author: nicolas-grekas

Normalizer/ObjectNormalizer.php

@@ -103,8 +103,14 @@ protected function extractAttributes($object, $format = null, array $context = [
             }
         }
 
+        $checkPropertyInitialization = \PHP_VERSION_ID >= 70400;
+
         // properties
         foreach ($reflClass->getProperties(\ReflectionProperty::IS_PUBLIC) as $reflProperty) {
+            if ($checkPropertyInitialization && !$reflProperty->isInitialized($object)) {
+                continue;
+            }
+
             if ($reflProperty->isStatic() || !$this->isAllowedAttribute($object, $reflProperty->name, $format, $context)) {
                 continue;
             }

Normalizer/PropertyNormalizer.php

@@ -101,9 +101,20 @@ protected function extractAttributes($object, $format = null, array $context = [
     {
         $reflectionObject = new \ReflectionObject($object);
         $attributes = [];
+        $checkPropertyInitialization = \PHP_VERSION_ID >= 70400;
 
         do {
             foreach ($reflectionObject->getProperties() as $property) {
+                if ($checkPropertyInitialization) {
+                    if (!$property->isPublic()) {
+                        $property->setAccessible(true);
+                    }
+
+                    if (!$property->isInitialized($object)) {
+                        continue;
+                    }
+                }
+
                 if (!$this->isAllowedAttribute($reflectionObject->getName(), $property->name, $format, $context)) {
                     continue;
                 }

Tests/Fixtures/Php74Dummy.php

@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures;
+
+/**
+ * @author Valentin Udaltsov <[email protected]>
+ */
+final class Php74Dummy
+{
+    public string $uninitializedProperty;
+
+    public string $initializedProperty = 'defaultValue';
+}

Tests/Normalizer/ObjectNormalizerTest.php

@@ -33,6 +33,7 @@
 use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\OtherSerializedNameDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Php74Dummy;
 use Symfony\Component\Serializer\Tests\Fixtures\SiblingHolder;
 use Symfony\Component\Serializer\Tests\Normalizer\Features\AttributesTestTrait;
 use Symfony\Component\Serializer\Tests\Normalizer\Features\CallbacksObject;
@@ -114,6 +115,18 @@ public function testNormalize()
         );
     }
 
+    /**
+     * @requires PHP 7.4
+     */
+    public function testNormalizeObjectWithUninitializedProperties()
+    {
+        $obj = new Php74Dummy();
+        $this->assertEquals(
+            ['initializedProperty' => 'defaultValue'],
+            $this->normalizer->normalize($obj, 'any')
+        );
+    }
+
     public function testDenormalize()
     {
         $obj = $this->normalizer->denormalize(

Tests/Normalizer/PropertyNormalizerTest.php

@@ -30,6 +30,7 @@
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
 use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\GroupDummyChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Php74Dummy;
 use Symfony\Component\Serializer\Tests\Fixtures\PropertyCircularReferenceDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\PropertySiblingHolder;
 use Symfony\Component\Serializer\Tests\Normalizer\Features\CallbacksObject;
@@ -87,6 +88,18 @@ public function testNormalize()
         );
     }
 
+    /**
+     * @requires PHP 7.4
+     */
+    public function testNormalizeObjectWithUninitializedProperties()
+    {
+        $obj = new Php74Dummy();
+        $this->assertEquals(
+            ['initializedProperty' => 'defaultValue'],
+            $this->normalizer->normalize($obj, 'any')
+        );
+    }
+
     public function testDenormalize()
     {
         $obj = $this->normalizer->denormalize(