Run tests also with Java 20

Author: slachiewicz

.github/workflows/maven.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest,windows-latest, macOS-latest]
-        java: [8, 11, 17]
+        java: [8, 11, 17, 20]
         jdk: [temurin]
       fail-fast: false
 
@@ -43,4 +43,7 @@ jobs:
           cache: 'maven'
 
       - name: Build with Maven
-        run: mvn install javadoc:javadoc -e -B -V -Pno-tests-if-not-on-osx
+        run: mvn install javadoc:javadoc -e -B -V
+
+      - name: Build with Maven and target Java level - ${{ matrix.java }}
+        run: mvn clean install javadoc:javadoc -e -DjavaVersion=${{ matrix.java }}

pom.xml

@@ -31,6 +31,9 @@
   </distributionManagement>
 
   <properties>
+    <!-- remove with parent upgrade -->
+    <maven.compiler.source>${javaVersion}</maven.compiler.source>
+    <maven.compiler.target>${javaVersion}</maven.compiler.target>
     <project.build.outputTimestamp>2021-09-21T23:45:11Z</project.build.outputTimestamp>
   </properties>