Well, the ideal solution would be to have them in Nixpkgs and to have the necessary developers to maintain them.

I really wish I had more time and more Nix knowledge. My Nix knowledge is growing though unfortunately my available time isn't. But I think #368598 is important and am willing to help test it.

(I use SDKMAN! and it is very useful when you are testing with a wide variety of JDKs, gradles, mavens. etc. At some point it might be nice to be able to install SDKMAN! with Nix.)

Maybe the best thing to do is create a JDK-focused fork of Nixpkgs with an integration branch. This would allow us to do more testing and integration prior to submission (and acceptance) by Nixpkgs.

BTW, JDK 25 version 25-ea+23, has the long-awaited JEP 512: Compact Source Files and Instance Main Methods implemented, so hello.java in the following format is both a valid Java program and a runnable script:

///usr/bin/env java "$0" "$@" ; exit $? 
void main() {
    IO.println("Hello, World!");
}