Jruby 9.2 JDK 8

Dockerfile

FROM ubuntu:20.04

ENV LANG en_US.UTF-8
ENV TMPDIR /tmp
ENV TEMP /tmp

RUN apt-get update \
    && apt-get install -y software-properties-common \
    locales \
    && locale-gen $LANG \
    && apt-get install -y build-essential \
    libc6-dev \
    git \
    curl \
    unzip \
    wget \
    --no-install-recommends \
    && rm -rf /var/lib/apt/lists/*


ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
ENV PATH="${JAVA_HOME}/bin:${PATH}"

RUN add-apt-repository -y ppa:openjdk-r

RUN apt-get update --fix-missing && \
    apt-get install -y openjdk-8-jre-headless openjdk-8-jdk-headless curl maven gradle libffi-dev

ENV JRUBY_VERSION 9.2.0.0
ENV JRUBY_SHA256 42718dea5fc90b7696cb3fccf8e8d546729173963ad0bc477d66545677d00684

RUN mkdir -p /opt/jruby \
  && curl -fSL https://s3.amazonaws.com/jruby.org/downloads/${JRUBY_VERSION}/jruby-bin-${JRUBY_VERSION}.tar.gz -o /tmp/jruby.tar.gz \
  && echo "$JRUBY_SHA256 */tmp/jruby.tar.gz" | sha256sum -c - \
  && tar -zx --strip-components=1 -f /tmp/jruby.tar.gz -C /opt/jruby \
  && rm /tmp/jruby.tar.gz \
  && ln -s /opt/jruby/bin/jruby /usr/local/bin/ruby