Use OpenJDK on Travis.

Author: uhafner

.travis.yml

@@ -1,5 +1,5 @@
 language: java
-jdk: oraclejdk8
+jdk: openjdk8
 install : true
 script: mvn -B -V clean verify jacoco:prepare-agent test failsafe:integration-test jacoco:report
 after_success:
@@ -11,4 +11,4 @@ notifications:
     - https://webhooks.gitter.im/e/5173f3381d39108eb52e
     on_success: change  # options: [always|never|change] default: always
     on_failure: always  # options: [always|never|change] default: always
-    on_start: never     # options: [always|never|change] default: always
+    on_start: never     # options: [always|never|change] default: always