We need Java 9 here too

Author: purejava

.github/workflows/build.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 1.8
+      - name: Set up JDK 1.9
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 1.9
       - name: Set up GPG
         run: |
           echo "$GPG_PRIVATE_KEY" > private.asc