Trying workaround for oraclejdk

Author: jgebal

.travis.yml

@@ -2,7 +2,7 @@ sudo: required
 
 language: java
 jdk:
-  - oraclejdk10
+  - openjdk8
 
 addons:
   sonarcloud:
@@ -11,6 +11,10 @@ addons:
     token:
       # Put sonar connection token generated and encrypted.
       secure: ${SONAR_TOKEN}
+  apt:
+    packages:
+      - oracle-java9-installer
+      - oracle-java9-set-default
 
 env:
   global: