Dockerfile available on Github: https://github.com/drosenbauer/raspberrypi3-docker/blob/master/java/Dockerfile
Java is installed to
$JAVA_HOME environment variable is defined in the image with that location specified. The Oracle JDK version is the latest available on the Raspberry Pi repository, which was
8u65 at the time of the latest image build.
This build also deletes the Resin
/usr/bin/entry.sh, because it causes mount errors on startup in my environment, and also blanks out the Resin ENTRYPOINT, which was set to that script.