Revert "java matrix build"

This reverts commit d750cad.

Author: niesfisch

.github/workflows/maven-tests.yml

@@ -17,24 +17,15 @@ env:
 permissions:
   contents: read
 
-concurrency:
-  group: maven-tests-${{ github.ref }}
-  cancel-in-progress: true
-
 jobs:
-  build:
-    name: Build and Test (JDK ${{ matrix.java }})
+  test:
+    name: Test (JDK ${{ matrix.java }})
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         java:
           - '8'
-          - '17'
-          - '18'
-          - '19'
-          - '20'
-          - '21'
 
     steps:
       - name: Checkout
@@ -47,8 +38,8 @@ jobs:
           java-version: ${{ matrix.java }}
           cache: maven
 
-      - name: Build and run tests
-        run: mvn -B -ntp verify
+      - name: Run tests
+        run: mvn -B -ntp test
 
       - name: Upload surefire reports
         if: always()
@@ -58,12 +49,27 @@ jobs:
           path: target/surefire-reports
           if-no-files-found: warn
 
-      - name: Upload packaged jars
-        if: success() && (matrix.java == '8' || matrix.java == '21')
-        uses: actions/upload-artifact@v4
+  package:
+    name: Package (JDK ${{ matrix.java }})
+    runs-on: ubuntu-latest
+    needs: test
+    strategy:
+      fail-fast: false
+      matrix:
+        java:
+          - '8'
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
         with:
-          name: java-code-tracer-jars-jdk-${{ matrix.java }}
-          path: |
-            target/*.jar
-          if-no-files-found: error
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+          cache: maven
+
+      - name: Build package
+        run: mvn -B -ntp package -DskipTests
 

README.md

@@ -103,8 +103,6 @@ This is a deliberate choice — the primary target is legacy and monolithic syst
 
 It runs fine on newer JVMs (11, 17, 21, …) without any changes.
 
-The GitHub Actions build validates the project on JDK 8 and on JDK 17 through 21.
-
 ## Build
 
 ```bash

pom.xml

@@ -12,7 +12,8 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>8</java.version>
-        <maven.compiler.release>${java.version}</maven.compiler.release>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
         <maven.surefire.plugin.version>3.2.5</maven.surefire.plugin.version>
         <maven.compiler.plugin.version>3.13.0</maven.compiler.plugin.version>
         <maven.assembly.plugin.version>3.7.1</maven.assembly.plugin.version>
@@ -31,7 +32,22 @@
         </license>
     </licenses>
 
+    <repositories>
+        <repository>
+            <id>Sonatype-public</id>
+            <name>SnakeYAML repository</name>
+            <url>http://oss.sonatype.org/content/groups/public/</url>
+        </repository>
+    </repositories>
+
     <dependencies>
+        <dependency>
+            <groupId>com.sun</groupId>
+            <artifactId>tools</artifactId>
+            <version>1.6.0</version>
+            <scope>system</scope>
+            <systemPath>${java.home}/../lib/tools.jar</systemPath>
+        </dependency>
         <dependency>
             <groupId>org.yaml</groupId>
             <artifactId>snakeyaml</artifactId>
@@ -81,7 +97,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven.compiler.plugin.version}</version>
                 <configuration>
-                    <release>${maven.compiler.release}</release>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
                 </configuration>
             </plugin>