From 5b9497f53d5c80a57d8b8057716917963858b7f2 Mon Sep 17 00:00:00 2001
From: Simon Massey <simon@simonmassey.org>
Date: Sun, 27 Jul 2025 17:41:09 +0100
Subject: [PATCH 1/2] feat: Implement multi-JDK CI build strategy

- Add Java 21 job to test core library compatibility
- Add Java 24 job to test full project including API tracker
- Separate cache keys for different JDK versions
- Validates Java 21 promise while enabling Java 24 tooling

Closes #9
---
 .github/workflows/maven.yml | 38 ++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index e7d3ea5..d31aee2 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -8,10 +8,33 @@ on:
     types: [opened, synchronize, reopened]
 
 jobs:
-  build:
+  test-java21:
+    name: Test Core Library (Java 21)
     runs-on: ubuntu-latest
-    name: Build with JDK 24
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'oracle'
+    
+    - name: Cache Maven dependencies
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-java21-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2-java21
+    
+    - name: Test core library (Java 21)
+      run: mvn clean test -pl json-java21
 
+  test-java24:
+    name: Test with Tooling (Java 24)
+    runs-on: ubuntu-latest
+    
     steps:
     - uses: actions/checkout@v4
     
@@ -25,11 +48,8 @@ jobs:
       uses: actions/cache@v4
       with:
         path: ~/.m2
-        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-        restore-keys: ${{ runner.os }}-m2
-    
-    - name: Build with Maven
-      run: mvn clean compile
+        key: ${{ runner.os }}-m2-java24-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2-java24
     
-    - name: Package JAR
-      run: mvn package
\ No newline at end of file
+    - name: Test full project (Java 24)
+      run: mvn clean test
\ No newline at end of file

From e53c43ee1c8d72faeb03a46f44fecf8838fcd4d0 Mon Sep 17 00:00:00 2001
From: Simon Massey <simon@simonmassey.org>
Date: Sun, 27 Jul 2025 17:55:36 +0100
Subject: [PATCH 2/2] ci fixes

---
 .github/workflows/daily-api-tracker.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/daily-api-tracker.yml b/.github/workflows/daily-api-tracker.yml
index 5541a76..fdee9ca 100644
--- a/.github/workflows/daily-api-tracker.yml
+++ b/.github/workflows/daily-api-tracker.yml
@@ -27,8 +27,8 @@ jobs:
         key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
         restore-keys: ${{ runner.os }}-m2
         
-    - name: Build project
-      run: mvn clean compile -DskipTests
+    - name: Build and test project
+      run: mvn clean install
       
     - name: Run API Tracker
       run: |