In this presentation, you will see available vendors in conemporary Java world, as an example I do it for JDK 11. We make comparison by image sizes, and performance of running image. As an example, I will take sample Spring Boot + Kotlin application.

• AdaptOpenJDK
• Amazon
• Azul Zulu
• Bellsoft
• SAP
• TravaOpenJDK

Some other vendors are not covered as they have restricted licenses or under another set of technologies set. For instance, GraalVM is a separate discussion track.

All images are taken with alpine Linux, if this distribution was available for comparison.

See results in Sizes comparison report

To compare performance and stats among different openjdk images, we have used Locust load testing framework.

poetry run locust -f load_test.py -u 500 -r 10 --host http://localhost:8085

Images themselves were constrained to use as much RAM as they require but bounded by 2 cores only.

docker run -p8085:8085 --cpuset-cpus="0,1" -d bellsoft_liberica-openjdk-alpine-musl:11

Reports for each distribution are available under stats/docker/<image_name> paths.

Size winner: bellsoft/liberica-openjdk-alpine-musl:11

Performance winners: amazoncorretto:11, azul_zulu-openjdk-alpine:11-jre, bellsoft_liberica-openjdk-alpine-musl:11

• I had a great hope for monolith single HTML download tool. Unfortunately, it couldn't downloag GIFs from cAdvisor monitor.

• I wanted to find a nice tool for running Docker images monitoring. cAdvisor was supposed to be the tool. As I use it, I figured out that even it builds nice looking graphs, it doesn't do more than docker stats, so it is not possible to see image performance over the last N minutes.

• Python dependency management tool Poetry helped a lot in preliminary download of images and generating size report.

• Docker did a good job as always, no complaints. :-)