Circle CI config with a machine executor and Java 11

config.yml

# Java Gradle CircleCI 2.0 configuration file
#
# Check https://circleci.com/docs/2.0/language-java/ for more details
#
version: 2
jobs:
  prebuild:
    machine:
      image: circleci/classic:201808-01
    steps:
      - checkout
      - run:
          name: Check java
          command: |
            set -xe

            JAVA_VERSION=zulu11.31.11-ca-jdk11.0.3-linux_x64

            docker login --username $DOCKERHUB_LOGIN --password $DOCKERHUB_PASSWORD

            wget https://cdn.azul.com/zulu/bin/${JAVA_VERSION}.tar.gz \
              -O /tmp/${JAVA_VERSION}.tar.gz
            sudo tar -zxf /tmp/${JAVA_VERSION}.tar.gz -C /usr/lib/jvm

            ls -l /usr/lib/jvm/

            export JAVA_HOME="/usr/lib/jvm/${JAVA_VERSION}"
            export PATH=/usr/lib/jvm/${JAVA_VERSION}/bin:$PATH
            
            java -version

  build:
    docker:
      # specify the version you desire here
      - image: circleci/openjdk:11-jdk

      # Specify service dependencies here if necessary
      # CircleCI maintains a library of pre-built images
      # documented at https://circleci.com/docs/2.0/circleci-images/
      # - image: circleci/postgres:9.4

    working_directory: ~/repo

    environment:
      # Customize the JVM maximum heap limit
      JVM_OPTS: -Xmx3200m
      TERM: dumb

    steps:
      - checkout

      # Download and cache dependencies
      - restore_cache:
          keys:
            - v1-dependencies-{{ checksum "build.gradle" }}
            # fallback to using the latest cache if no exact match is found
            - v1-dependencies-

      - setup_remote_docker
      - run: gradle dependencies
      - save_cache:
          paths:
            - ~/.gradle
          key: v1-dependencies-{{ checksum "build.gradle" }}

      - run:
          name: Check java
          command: |
              set -xe
              docker login --username $DOCKERHUB_LOGIN --password $DOCKERHUB_PASSWORD
              ls -la
              java -version

      # run tests!
      #- run: gradle test

workflows:
  version: 2
  build-test-and-deploy:
    jobs:
      - prebuild
      - build:
          requires:
            - prebuild