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