Libraries and samples to ease building and deploying cross-platform (Windows, Linux, MacOS, and Web) applications from one Java source code base. No XML, CSS, HTML, or Javascript is required.
The top level readme needs to make it clear exactly which version(s) of the JDK this works with. There is a mention buried in a lower readme, and a link to something that appears to be the OpenJDK, but no installer.
I know very little about this, but I've always used the Oracle Java SE downloads before, and that comes with an installer. Guidance is required.