frolvlad/alpine-java

Java Docker image

This image is based on Alpine Linux image, which is only a 5MB image, and contains Java runtime (JRE) and Java development kit (JDK) conveniently packaged into separate Docker tags.

You must accept the Oracle Binary Code License Agreement for Java SE to use this image (see https://github.com/frol/docker-alpine-java/issues/6 for details).

JDK bundle contains lots of unnecessary for Docker image stuff, so it was cleaned up. There are 3 tags: *-full (only src tarballs get removed), *-cleaned (desktop parts get cleaned), *-slim (everything but compiler and jvm is removed). master branch refers to jdk8-slim tag, but latest tag points to jdk8-cleaned.

jdk8-slim (master branch) download image size is:

jdk8-cleaned (latest tag) download image size is:

jdk8-full download image size is:

*** using jre* tags of this image if you only need JRE (you can run Java applications, but cannot build/compile them):

jre8-slim (master branch) download image size is:

jre8-cleaned (latest tag) download image size is:

jre8-full download image size is:

Usage Example

bash
$ echo 'public class Main { public static void main(String[] args) { System.out.println("Hello World"); } }' > Main.java
$ docker run --rm -v "$(pwd)":/mnt --workdir /mnt frolvlad/alpine-java:jdk8-slim sh -c "javac Main.java && java Main"

Once you have run this command you will get printed 'Hello World' from Java!

Tips

Use Docker multi-stage builds to slim down your final Docker images:

Dockerfile
FROM frolvlad/alpine-java:jdk8-slim AS builder

RUN echo 'public class Main { public static void main(String[] args) { System.out.println("Hello World"); } }' > Main.java
RUN javac Main.java

FROM frolvlad/alpine-java:jre8-slim
COPY --from=builder /Main.class /

CMD ["java", "Main"]

$ docker build -t my-app .
$ docker run --rm my-app
Hello World

Your application image is going to be only 119MB on disk.