Update java.yml (indy256#149)

Author: indy256

.github/workflows/java.yml

@@ -3,7 +3,7 @@ name: Java CI
 on: [push]
 
 jobs:
-  build-ubuntu-java:
+  build-ubuntu-java-latest:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -15,3 +15,16 @@ jobs:
       run: |
         cd java
         ant -noinput -buildfile build.xml
+
+  build-ubuntu-java-8:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build with Ant
+      run: |
+        cd java
+        ant -noinput -buildfile build.xml