From 39f6d529300a80bc7adf1ab4979225513aa5d7e3 Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@sensiolabs.de>
Date: Sat, 8 Dec 2018 13:04:45 +0000
Subject: [PATCH] fix compatibility with Symfony Config 4.2

---
 DependencyInjection/Configuration.php | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 84e8b454..3f984581 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -22,12 +22,13 @@ public function __construct($debug = false)
 
     public function getConfigTreeBuilder()
     {
-        $tb = new TreeBuilder();
+        $tb = new TreeBuilder('jms_serializer');
 
-        $root = $tb
-            ->root('jms_serializer', 'array')
-                ->children()
-        ;
+        if (method_exists($tb, 'getRootNode')) {
+            $root = $tb->getRootNode()->children();
+        } else {
+            $root = $tb->root('jms_serializer')->children();
+        }
 
         $this->addHandlersSection($root);
         $this->addSubscribersSection($root);