From 6f1a18af529b7d2394a76ee4ee974a146314fcf3 Mon Sep 17 00:00:00 2001
From: Marcono1234 <Marcono1234@users.noreply.github.com>
Date: Mon, 27 Nov 2023 01:34:26 +0100
Subject: [PATCH] Enforce that JDK <= 17 is used for building (#2551)

Using JDK 21 currently causes multiple issues, some of which are not easy
to fix at the moment (such as target version 7 not being supported anymore).
---
 README.md | 2 +-
 pom.xml   | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index a39a9ea6..cd06c0a4 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ Gson uses Maven to build the project:
 mvn clean verify
 ```
 
-JDK 11 or newer is required for building, JDK 17 is recommended.
+JDK 11 or newer is required for building, JDK 17 is recommended. Newer JDKs are currently not supported for building (but are supported when _using_ Gson).
 
 ### Contributing
 
diff --git a/pom.xml b/pom.xml
index 889005d4..3e89ab58 100644
--- a/pom.xml
+++ b/pom.xml
@@ -120,7 +120,9 @@
                 <!-- Enforce that correct JDK version is used to avoid cryptic build errors -->
                 <requireJavaVersion>
                   <!-- Other plugins of this build require at least JDK 11 -->
-                  <version>[11,)</version>
+                  <!-- Fail fast when building with JDK > 17 because it causes build failures,
+                    see https://github.com/google/gson/issues/2501 -->
+                  <version>[11,18)</version>
                 </requireJavaVersion>
               </rules>
             </configuration>