Dockerfile-slimmed

FROM azul/zulu-openjdk-alpine:17 as builder
LABEL maintainer="dlmcpaul@gmail.com"

ENV JAVA_MINIMAL=/opt/jre

# Generate a minimal java runtime using the latest azul/zulu-openjdk-alpine
ARG JAR_FILE
COPY ${JAR_FILE} /app.jar

RUN MODULES=$("$JAVA_HOME/bin/jdeps" --print-module-deps /app.jar) \
    && echo modules identified = "$MODULES" \
    && "$JAVA_HOME/bin/jlink" \
    --verbose \
    --add-modules \
        "$MODULES",java.sql,java.naming,java.desktop,java.management,java.security.jgss,java.instrument,jdk.unsupported \
    --compress 2 \
    --strip-debug \
    --no-header-files \
    --no-man-pages \
    --output "$JAVA_MINIMAL"

# Start with fresh copy of alpine linux
FROM alpine:3
LABEL maintainer="dlmcpaul@gmail.com"

ARG JAR_FILE

# copy our minimal runtime
ENV JAVA_MINIMAL=/opt/jre
ENV PATH="$PATH:$JAVA_MINIMAL/bin"
COPY --from=builder "$JAVA_MINIMAL" "$JAVA_MINIMAL"

# copy our application
COPY ${JAR_FILE} /app.jar

# Override these for your timezone and language
ENV TZ="Australia/Sydney" \
    LANG="en_AU.UTF-8"

# expose the internal endpoint
EXPOSE 8080

ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-Dspring.jmx.enabled=false", "-jar", "/app.jar"]