Dockerfile

#
# Build stage
#
FROM maven:3.6.3-jdk-11-slim AS build
COPY src /tmp/build/src
COPY pom.xml /tmp/build
RUN mvn -f /tmp/build/pom.xml clean package

#
# Package stage
#
FROM adoptopenjdk/openjdk11:jre-11.0.5_10-alpine
# Ports (KNX and 40001-40003 for tunneling without NAT)
EXPOSE 3671/udp 40001/udp 40002/udp 40003/udp
# add for 'tput' command to fetch the terminal size
RUN apk add ncurses
# add fake symbol as alpine has no /bin/bash
RUN ln -s /bin/sh /bin/bash
# copy the build package
COPY --from=build /tmp/build/target/knx-demo-tty-monitor.jar /app/knx-demo-tty-monitor.jar
# the entrypoint script and make it executable
COPY docker-entrypoint.sh /usr/local/bin
RUN chmod +x /usr/local/bin/docker-entrypoint.sh
# define /app as working directory
WORKDIR /app
# Entrypoint 
ENTRYPOINT [ "docker-entrypoint.sh" ]