.gitlab-ci.yml

variables:
  # This will supress any download for dependencies and plugins or upload messages which would clutter the console log.
  # `showDateTime` will show the passed time in milliseconds. You need to specify `--batch-mode` to make this work.
  MAVEN_OPTS: "-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true"
  # As of Maven 3.3.0 instead of this you may define these options in `.mvn/maven.config` so the same config is used
  # when running from the command line.
  # `installAtEnd` and `deployAtEnd`are only effective with recent version of the corresponding plugins.
  MAVEN_CLI_OPTS: "--batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true -DdeployAtEnd=true"

# Cache downloaded dependencies and plugins between builds.
cache:
  paths:
    - /root/.m2/repository/

# This will only validate and compile stuff and run e.g. maven-enforcer-plugin. 
# Because some enforcer rules might check dependency convergence and class duplications
# we use `test-compile` here instead of `validate`, so the correct classpath is picked up.
validate:
  stage: build
  script:
    - 'mvn $MAVEN_CLI_OPTS test-compile'
  only:
    - master
  image: maven:3.3.9-jdk-8

# For merge requests do not `deploy` but only run `verify`.
# See https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
verify:
  stage: test
  script:
    - 'mvn $MAVEN_CLI_OPTS verify'
  only:
    - master
  image: maven:3.3.9-jdk-8