Try using trusty setting to upgrade travis oraclejdk8.

michaelwoodson · michaelwoodson · commit 910cf9c8a5e7 · 2016-02-15T16:39:34.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: groovy
 sudo: false
+dist: trusty
 
 install:
  - ./gradlew clean
