From 4fb1cb87682d695b4f83907be7808141e1e35522 Mon Sep 17 00:00:00 2001
From: Nikolas Grottendieck <git@nikolasgrottendieck.com>
Date: Sat, 15 Oct 2022 17:55:31 +0200
Subject: [PATCH] add GitHub Actions workflow to verify builds and pull
 requests

---
 .github/workflows/main.yml | 94 ++++++++++++++++++++++++++++++++++++++
 pom.xml                    | 48 +++++++++++++++++--
 2 files changed, 139 insertions(+), 3 deletions(-)
 create mode 100644 .github/workflows/main.yml

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 00000000..cf235a56
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,94 @@
+# This workflow will build a Java project with Maven
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: read
+
+jobs:
+  build-6:
+    runs-on: ubuntu-latest
+    name: Java 6
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@master
+        with:
+          distribution: zulu
+          java-version: |
+            6
+            11
+      - name: Setup Maven
+        run: |
+          mkdir -p .mvn
+          echo "-B" > .mvn/maven.config
+      - name: Compile with Java 6
+        run: mvn clean compile -Dmaven.toolchains.jdk.id=zulu_6 -P java-6,!legacy-java,!modern-java
+      - name: Run Tests with Java 6
+        run: mvn test -Dmaven.toolchains.jdk.id=zulu_6 -P java-6,!legacy-java,!modern-java
+      - name: Build Test Report for Java 6
+        if: ${{ always() }}
+        run: |
+          mvn surefire-report:report-only
+          mvn site -DgenerateReports=false
+      - name: Upload Test Results for Java 6
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: Test Results for Java 6
+          path: target/surefire-reports/
+      - name: Upload Test Report 6
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: Test Report for Java 6
+          path: target/site/
+
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 11, 17 ]
+    name: Java ${{ matrix.java }}
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v3
+      # Set up an alternative JDK to be used with Maven; using master to support Toolchains Output
+      - name: Set up JDK
+        uses: actions/setup-java@master
+        with:
+          distribution: zulu
+          java-version: ${{ matrix.java }}
+      - name: Setup Maven
+        run: |
+          mkdir -p .mvn
+          echo "-B" > .mvn/maven.config
+      - name: Compile with Java ${{ matrix.java }}
+        run: mvn clean compile
+      - name: Run Tests with Java ${{ matrix.java }}
+        run: mvn test
+      - name: Build Test Report for Java ${{ matrix.java }}
+        if: ${{ always() }}
+        run: |
+          mvn surefire-report:report-only
+          mvn site -DgenerateReports=false
+      - name: Upload Test Results for Java ${{ matrix.java }}
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: Test Results for Java ${{ matrix.java }}
+          path: target/surefire-reports/
+      - name: Upload Test Report ${{ matrix.java }}
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: Test Report for Java ${{ matrix.java }}
+          path: target/site/
diff --git a/pom.xml b/pom.xml
index 19b055c2..644244e4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -67,10 +67,26 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>2.3.1</version>
+                <version>3.10.1</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-toolchains-plugin</artifactId>
+                <version>3.1.0</version>
+                <executions>
+                    <execution>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>toolchain</goal>
+                        </goals>
+                    </execution>
+                </executions>
                 <configuration>
-                    <source>1.6</source>
-                    <target>1.6</target>
+                    <toolchains>
+                        <jdk>
+                            <version>[1.6,)</version>
+                        </jdk>
+                    </toolchains>
                 </configuration>
             </plugin>
             <plugin>
@@ -115,6 +131,32 @@
     </distributionManagement>
 
     <profiles>
+        <profile>
+            <id>java-6</id>
+            <properties>
+                <maven.compiler.source>1.6</maven.compiler.source>
+                <maven.compiler.target>1.6</maven.compiler.target>
+            </properties>
+        </profile>
+        <profile>
+            <id>legacy-java</id>
+            <activation>
+                <jdk>(,8]</jdk>
+            </activation>
+            <properties>
+                <maven.compiler.source>${java.specification.version}</maven.compiler.source>
+                <maven.compiler.target>${java.specification.version}</maven.compiler.target>
+            </properties>
+        </profile>
+        <profile>
+            <id>modern-java</id>
+            <activation>
+                <jdk>[9,)</jdk>
+            </activation>
+            <properties>
+                <maven.compiler.release>${java.specification.version}</maven.compiler.release>
+            </properties>
+        </profile>
         <profile>
             <id>release-sign-artifacts</id>
             <activation>