Merge branch '6.1' into 6.2

* 6.1:
  Update ExceptionInterface.php
  Revert removal of Stringable check
  Flush with flush() after ob_end_flush()
  [Validator] : Fix "PHP Warning: Undefined array key 1" in NotCompromisedPasswordValidator
  [Validator] Fix traverse option on Valid constraint when used as Attribute
  [HttpFoundation] Fix deleteFileAfterSend on client abortion
  Prevent that bad Ignore method annotations lead to incorrect results
  also fix the test
  fix deprecation
  fix sending request to paths containing multiple slashes
  Fix generated validation error message for wrong exception mapping status code

Author: derrabus

Mapping/Loader/AnnotationLoader.php

@@ -134,6 +134,10 @@ public function loadClassMetadata(ClassMetadataInterface $classMetadata): bool
 
                     $attributeMetadata->setSerializedName($annotation->getSerializedName());
                 } elseif ($annotation instanceof Ignore) {
+                    if (!$accessorOrMutator) {
+                        throw new MappingException(sprintf('Ignore on "%s::%s()" cannot be added. Ignore can only be added on methods beginning with "get", "is", "has" or "set".', $className, $method->name));
+                    }
+
                     $attributeMetadata->setIgnore(true);
                 } elseif ($annotation instanceof Context) {
                     if (!$accessorOrMutator) {

Tests/Fixtures/Annotations/Entity45016.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+use Symfony\Component\Serializer\Annotation\Ignore;
+
+class Entity45016
+{
+    /**
+     * @var int
+     */
+    private $id = 1234;
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    /**
+     * @Ignore()
+     */
+    public function badIgnore(): bool
+    {
+        return true;
+    }
+}

Tests/Fixtures/Attributes/Entity45016.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\Ignore;
+
+class Entity45016
+{
+    /**
+     * @var int
+     */
+    private $id = 1234;
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    #[Ignore]
+    public function badIgnore(): bool
+    {
+        return true;
+    }
+}

Tests/Mapping/Loader/AnnotationLoaderTest.php

@@ -139,6 +139,19 @@ public function testThrowsOnContextOnInvalidMethod()
         $loader->loadClassMetadata($classMetadata);
     }
 
+    public function testCanHandleUnrelatedIgnoredMethods()
+    {
+        $class = $this->getNamespace().'\Entity45016';
+
+        $this->expectException(MappingException::class);
+        $this->expectExceptionMessage(sprintf('Ignore on "%s::badIgnore()" cannot be added', $class));
+
+        $metadata = new ClassMetadata($class);
+        $loader = $this->getLoaderForContextMapping();
+
+        $loader->loadClassMetadata($metadata);
+    }
+
     abstract protected function createLoader(): AnnotationLoader;
 
     abstract protected function getNamespace(): string;