Fix build (#264)

- exclude JDK 21 with adopt-openj9 - it is not present
- Disable MJAVADOC-427 on JDK 8

Author: slawekjaranowski

.github/workflows/maven.yml

@@ -27,4 +27,7 @@ jobs:
     uses: apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v3
     with:
       jdk-distribution-matrix: '[ "temurin", "zulu", "microsoft", "liberica", "adopt-openj9" ]'
-      matrix-exclude: '[{ "jdk": "8", "distribution": "microsoft"}]'
+      matrix-exclude: '[
+        { "jdk": "8", "distribution": "microsoft"},
+        { "jdk": "21", "distribution": "adopt-openj9"}
+      ]'

src/it/projects/MJAVADOC-427/invoker.properties

@@ -18,4 +18,5 @@
 invoker.goals=clean javadoc:javadoc
 
 # slf4j javadoc is hosted on https site with a "let's encrypt" certificate, signed by IdenTrust only trusted since 8u101 (JDK-8154757)
-invoker.java.version = 1.8.0.101+
+# consider to execute on JDK8 after - MJAVADOC-786
+invoker.java.version = 9+