Commits on May 31, 2019

1. Switch to openjdk for Travis checks. …

   Travis started switching to Ubuntu 16.04 (Xenial) from 14.04 (Trusty)
   for all builds. The Oracle JDK does not come pre-installed any more and
   is causing the issue during install:
   ```
   Installing oraclejdk8
   $ export JAVA_HOME=~/oraclejdk8
   $ export PATH="$JAVA_HOME/bin:$PATH"
   $ ~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace
   "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"
   install-jdk.sh 2019-05-02
   Expected feature release number in range of 9 to 13, but got: 8
   The command "~/bin/install-jdk.sh --target "/home/travis/oraclejdk8"
   --workspace "/home/travis/.cache/install-jdk" --feature "8" --license
   "BCL"" failed and exited with 3 during .
   Your build has been stopped.
   ```
   One option is to set `dist: trusty` but that's an EOL distro at this
   point. Switching to openjdk feels safer choice at this point.
   
   References:
   
   * https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment
   * https://travis-ci.community/t/install-of-oracle-jdk-8-failing/3038

   

   zvezdan committed May 31, 2019
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