See this repository's CONTRIBUTING.md for instructions.

This image has Java installed via the Jupyter Java project project. The Java 17 kernel is provided by JJava and the runtime is OpenJDK JRE 21.0.7 and OpenJDK.

$ java -version
openjdk version "21.0.7" 2025-04-15
OpenJDK Runtime Environment (build 21.0.7+6-Ubuntu-0ubuntu122.04)
OpenJDK 64-Bit Server VM (build 21.0.7+6-Ubuntu-0ubuntu122.04, mixed mode, sharing)
$ javac -version
javac 21.0.7

You should use repo2docker to build and use/test the image on your own device before you push and create a PR. It's better (and typically faster) to do this first before using CI/CD. There's no need to waste Github Action minutes to test build images when you can do this on your own device!

Run repo2docker from inside the cloned image repo. To run on a linux/WSL2 linux shell:

repo2docker . # <--- the path to the repo

If you are using an ARM CPU (Apple M* silicon), you will need to run jupyter-repo2docker with the following arguments:

jupyter-repo2docker --user-id=1000 --user-name=jovyan \
  --Repo2Docker.platform=linux/amd64 \
  --target-repo-dir=/home/jovyan/.cache \
  -e PLAYWRIGHT_BROWSERS_PATH=/srv/conda \
  . # <--- the path to the repo

If you just want to see if the image builds, but not automatically launch the server, add --no-run to the arguments (before the final .).