Dockerfile

FROM openjdk:8-jdk-alpine as builder
# ----
# Install Maven
RUN apk add --no-cache curl tar bash
ARG MAVEN_VERSION=3.3.9
ARG USER_HOME_DIR="/root"
RUN mkdir -p /usr/share/maven && \
curl -fsSL http://apache.osuosl.org/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz | tar -xzC /usr/share/maven --strip-components=1 && \
ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
ENV MAVEN_HOME /usr/share/maven
ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
# speed up Maven JVM a bit
ENV MAVEN_OPTS="-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
ENTRYPOINT ["/usr/bin/mvn"]
# ----
# Install project dependencies and keep sources
# make source folder
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
# install maven dependency packages (keep in image)
COPY pom.xml /usr/src/app
RUN mvn --quiet --threads 1C install
# copy other source files (keep in image)
COPY src /usr/src/app/src

# package
RUN mvn package --quiet --update-snapshots --threads 1C --offline -Dmaven.test.skip=true

# Base Alpine Linux based image with OpenJDK JRE only
FROM openjdk:8-jre-alpine
# copy application WAR (with libraries inside)
COPY --from=builder /usr/src/app/target/service.jar /app.jar
# specify default command
CMD ["/usr/bin/java", "-jar", "/app.jar"]