Spring Boot Docker | Gradle | Multi-Stage Build

Dockerfile

# Gradle version of this: https://spring.io/guides/topicals/spring-boot-docker/#_multi_stage_build
FROM azul/zulu-openjdk-alpine:11.0.5 as build
WORKDIR /workspace/app/

COPY gradlew .
COPY gradle gradle
COPY build.gradle settings.gradle /workspace/app/
COPY src src

ENV GRADLE_OPTS -Dorg.gradle.daemon=false -Dorg.gradle.internal.launcher.welcomeMessageEnabled=false 

RUN ./gradlew build
RUN mkdir -p build/dependency && (cd build/dependency; jar -xf ../libs/*.jar)

FROM azul/zulu-openjdk-alpine:11.0.5-jre
VOLUME /tmp
ENV DEPENDENCY=/workspace/app/build/dependency
COPY --from=build $DEPENDENCY/BOOT-INF/lib /app/lib
COPY --from=build $DEPENDENCY/META-INF /app/META-INF
COPY --from=build $DEPENDENCY/BOOT-INF/classes /app
EXPOSE 8080
ENTRYPOINT ["java", "-cp", "app:app/lib/*", "com.programmingskillz.Application"]

For more details, read this article: https://spring.io/guides/topicals/spring-boot-docker