OpenJDK Java 17 docker image

Question

We are upgrading our microservices in docker to use Java 17 and previously we used the base image openjdk:11-jre-slim. What is the corresponding image for Java 17?

There doesn't seem to be a openjdk:17-jre-slim? In fact there dont seem to be any recent jre images - just jdks. The 11-jre-slim image seems to be arount 75MB - is there a suitable similarly sized Java 17 image?

We have also used alpine images in the past too.

Answer 1

Oracle image is freely available from Java-17 openjdk:17-oracle

Dockerfile:

FROM openjdk:17-oracle

openjdk:17-jdk-slim also creates lightweight image

Dockerfile:

FROM openjdk:17-jdk-slim

Answer 2

If you are looking for the tiniest Docker images with Alpine Linux and OpenJDK, have a look at Liberica JDK containers at DockerHub https://hub.docker.com/r/bellsoft/liberica-openjdk-alpine The images have Alpine and Liberica Lite, which is optimized in size to be used on microservices. It is also recommended by the Spring team https://spring.io/quickstart

Answer 3

(As of 2023) Do not use any openjdk:17- images, because what you may get are old early jdk 17 builds with security issues !
On https://hub.docker.com/_/openjdk there is clear

DEPRECATION NOTICE

openJDK 17 is not build anymore!
(and not maintained in https://github.com/docker-library/openjdk)

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While it was simpler before to use whatever linux flavour, now you need to make choice as different openJDK builds docker images will use different linux flavours.

E.g. amazoncorreto - Amazon Linux,
Oracle JDK - Oracle Linux etc

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Different sources may recommend differently

E.g. on https://docs.docker.com/language/java/build-images/ uses eclipse-temurin

FROM eclipse-temurin:17-jdk-jammy

Answer 4

You can try this (eclipse-temurin:17-jre-alpine) which is around 50MB of compressed size https://hub.docker.com/layers/eclipse-temurin/library/eclipse-temurin/17-jre-alpine/images/sha256-839f3208bfc22f17bf57391d5c91d51c627d032d6900a0475228b94e48a8f9b3?context=explore

I couldn't sill find an OpenJDK jre image

Answer 5

Adding to @PaulVerest's excellent answer, for the benefit of other newbies like me, I am posting here the Dockerfile that works for me (as of May 2023, built and run from a Windows 10 PC):

FROM amazoncorretto:17.0.7-alpine

# Add app user
ARG APPLICATION_USER=appuser
RUN adduser --no-create-home -u 1000 -D $APPLICATION_USER

# Configure working directory
RUN mkdir /app && \
    chown -R $APPLICATION_USER /app

USER 1000

COPY --chown=1000:1000 ./myapp-0.0.1-SNAPSHOT.jar /app/app.jar
WORKDIR /app

EXPOSE 8080
ENTRYPOINT [ "java", "-jar", "/app/app.jar" ]

If you built your container using:

docker build -t docker_myapp .

Then, run it from the command line using:

docker run -p 8080:8080 docker_myapp

Note: You can't stop it from the same command line using Ctrl+C. To stop it, you need to open another command line and do:

docker ps
CONTAINER ID   IMAGE                    COMMAND                  CREATED       STATUS       PORTS                    NAMES
16dad8047672   docker_myapp   "java -jar /app/app.…"   7 hours ago   Up 7 hours   0.0.0.0:8080->8080/tcp   sharp_rode

Then:

docker stop 16dad8047672   

Answer 6

An update on this - looking again at the Eclipse Adoptium issue mentioned above (https://github.com/adoptium/temurin-build/issues/2683) the more recent comments indicate they have now started producing JRE images.

We have switched to using eclipse-temurin:17-jre-focal. There is also a (slightly larger) 17-jre-centos7 and a smaller 17-jre-alpine, but we now need some libraries that aren't in alpine.

Answer 7

In your Dockerfile link:

FROM openjdk:17-alpine