Use correct jdk and scala versions in travis

Author: vikraman

.travis.yml

@@ -2,17 +2,21 @@
  dist: trusty
  sudo: true
  scala:
-   - "2.11.7"
- jdk:
-   - oraclejdk7
-   - oraclejdk8
-   - openjdk8
+   - "2.11.8"
+   - "2.12.1"
  before_script:
+   - jdk_switcher use ${JDK}
    - sh src/test/resources/setup_travis.sh
  before_install:
    - cat /etc/hosts
  env:
-   - LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
+   - LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib JDK=oraclejdk7
+   - LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib JDK=oraclejdk8
+   - LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib JDK=openjdk8
  addons:
    #workaround for openjdk buffer overflow
-   hostname: dummy
+   hostname: dummy
+ matrix:
+   exclude:
+     - scala: 2.12.1
+       env: JDK=oraclejdk7