Change Java version to resolve Sonar scanner issues

jgebal · jgebal · commit 6ee0daa64ced · 2021-11-04T00:50:27.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ services:
   - docker
 
 jdk:
-  - openjdk9
+  - openjdk-9-jre-headless
 
 addons:
   sonarcloud:
