test: add openj9 to the matrix (#974)

.travis.yml

@@ -24,6 +24,8 @@ env:
before_install:
  - ./.travis/travis_install_zulu.sh
  - test -z "${ZULU_JDK}" || export JDK${ZULU_JDK}_HOME=/usr/lib/jvm/zulu-${ZULU_JDK}-amd64
  - ./.travis/travis_install_openj9.sh
  - test -z "${OPENJ9}" || export JDK${JDK}_HOME=${HOME}/jdk-9+${OPENJ9}

script:
  # make sure previous build artifacts are not used for subsequent builds
@@ -77,6 +79,12 @@ matrix:
      env:
        - PG_VERSION=9.6
        - JDK=9
    - jdk: oraclejdk9
      sudo: required
      env:
        - PG_VERSION=10
        - JDK=9
        - OPENJ9=181
    - jdk: oraclejdk8
      sudo: required
      env:

.travis/travis_install_openj9.sh

@@ -0,0 +1,13 @@
#!/usr/bin/env bash

set -o xtrace -o errexit

if [[ "${TRAVIS_SUDO}" == "true" && -n "${OPENJ9}" ]]
then
  # Build to Download
  BUILD=${OPENJ9}
  # Download from AdoptOpenJDK
  wget --quiet -O /tmp/openj9.tar.gz https://github.com/AdoptOpenJDK/openjdk9-openj9-releases/releases/download/jdk-9%2B${BUILD}/OpenJDK9-OPENJ9_x64_Linux_jdk-9.${BUILD}.tar.gz
  tar xfz /tmp/openj9.tar.gz -C ${HOME} # extract to ${HOME}/jdk-9+${BUILD}/
  ${HOME}/jdk-9+${BUILD}/bin/java -version
fi