From f3fedd09000aefa874bf3717631f238dfd258252 Mon Sep 17 00:00:00 2001
From: Davide Angelocola <davide.angelocola@gmail.com>
Date: Sun, 28 Jun 2026 09:20:08 +0200
Subject: [PATCH] experiment: lower compile target to JDK 22 and test 22 + 25
 in CI
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FFM (java.lang.foreign) went stable in JDK 22 (JEP 454), so the project may
not actually need a JDK 25 floor. Drop maven.compiler.release 25 -> 22 and
run the CI build matrix on both 22 and 25 to find out. If 22 is green, the
supported floor can drop, widening the addressable audience substantially
(most prod JVMs are on 17/21, not 25).

Experiment only — not for merge as-is; report-driven.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 .github/workflows/ci.yml | 10 ++++++++--
 pom.xml                  |  6 +++---
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d9c2be9..fd04967 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,12 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Experiment: does the project build + test on JDK 22 (first stable FFM)
+        # as well as 25? If 22 is green, the supported floor can drop from 25.
+        java: ['22', '25']
 
     steps:
       - name: Checkout (with zstd submodule)
@@ -16,11 +22,11 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Set up JDK 25
+      - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: '25'
+          java-version: ${{ matrix.java }}
           cache: maven
 
       - name: Set up Zig
diff --git a/pom.xml b/pom.xml
index d5026d6..b9901f3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -50,7 +50,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<maven.compiler.release>25</maven.compiler.release>
+		<maven.compiler.release>22</maven.compiler.release>
 		<central-publishing-plugin.version>0.11.0</central-publishing-plugin.version>
 		<maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
 		<maven-source-plugin.version>3.4.0</maven-source-plugin.version>
@@ -164,7 +164,7 @@
 					<artifactId>maven-compiler-plugin</artifactId>
 					<version>3.15.0</version>
 					<configuration>
-						<release>25</release>
+						<release>22</release>
 						<failOnWarning>true</failOnWarning>
 						<compilerArgs>
 							<arg>-Xlint:all</arg>
@@ -176,7 +176,7 @@
 					<artifactId>maven-javadoc-plugin</artifactId>
 					<version>3.12.0</version>
 					<configuration>
-						<release>25</release>
+						<release>22</release>
 						<failOnError>true</failOnError>
 						<failOnWarnings>true</failOnWarnings>
 						<quiet>true</quiet>