"Try" to use the latest Ubuntu Distro in Travis and openJDK10 (as with 11 there were some engine issues).

.travis.yml

@@ -1,7 +1,7 @@
 language: java
 sudo: false
-jdk: oraclejdk8
-dist: trusty
+jdk: openjdk10
+dist: bionic
 
 before_cache:
  - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock