FROM ubuntu:18.04 RUN apt-get update && \ apt-get install -y software-properties-common build-essential openjdk-8-jdk curl RUN rm -rf \ /var/lib/apt/lists/* \ /var/cache/debconf \ /tmp/* \ RUN apt-get clean ARG ver=42.2.12 RUN curl -L -o /postgresql-java-${ver}.jar https://repo1.maven.org/maven2/org/postgresql/postgresql/${ver}/postgresql-${ver}.jar ENV CLASSPATH=$CLASSPATH:/postgresql-java-${ver}.jar WORKDIR /jdbc COPY Test.java Test.java RUN javac Test.java