diff --git a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
index ebfe435f87126..326bfd184f497 100644
--- a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
+++ b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
@@ -97,9 +97,13 @@ public function process(ContainerBuilder $container)
// We must assume that the class value has been correctly filled, even if the service is created by a factory
$class = $container->getParameterBag()->resolveValue($def->getClass());
-
$interface = 'Symfony\Component\EventDispatcher\EventSubscriberInterface';
+
if (!is_subclass_of($class, $interface)) {
+ if (!class_exists($class, false)) {
+ throw new \InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
+ }
+
throw new \InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, $interface));
}
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
index 3187e943c94f4..0c4cecef66423 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
@@ -54,7 +54,12 @@ public function process(ContainerBuilder $container)
$class = $container->getParameterBag()->resolveValue($def->getClass());
$interface = 'Symfony\Component\HttpKernel\Fragment\FragmentRendererInterface';
+
if (!is_subclass_of($class, $interface)) {
+ if (!class_exists($class, false)) {
+ throw new \InvalidArgumentException(sprintf('Class "%s" used for service "%s" cannot be found.', $class, $id));
+ }
+
throw new \InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, $interface));
}
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