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NixOS JVM

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17 Jul 2025
@msgilligan:matrix.orgmsgilliganI wish there was a way to mark an issue as "I'd like to help". i.e. one step beyond giving it a 👍18:51:27
@emilazy:matrix.orgemilyyou can just comment :)18:52:09
@msgilligan:matrix.orgmsgilliganI do that. But it would be nice to be able to find all the issues I'm interested in helping on with a search on GitHub.18:53:44
@msgilligan:matrix.orgmsgilliganLike a bookmark or something18:54:01
@infinidoge:inx.moeInfinidoge 🏳️‍⚧️Subscribe to the issue, then you can bookmark it from notifications18:54:28
@infinidoge:inx.moeInfinidoge 🏳️‍⚧️It'll also just be in notifications in general18:55:23
@msgilligan:matrix.orgmsgilliganI'm already overwhelmed by notifications haha18:55:47
@msgilligan:matrix.orgmsgilligan... but the bookmarking from notifications looks like it should work. Thanks for that suggestion!19:03:14
@msgilligan:matrix.orgmsgilligan@emily do you mind if I copy/paste this into Issue #313213?19:09:36
@emilazy:matrix.orgemilysure thing19:10:49
@emilazy:matrix.orgemilybut I'm excited to be proven wrong when I see a build error and go "oh no OpenJDK is really doing something cursed" :)19:11:13
@emilazy:matrix.orgemily(I do think it's probably only a day or two's job these days though, now that our macOS support is much better)19:11:31
@msgilligan:matrix.orgmsgilligan"a day or two" probably means a week for me, but the Nix tasks I have on my to do list between now and September should probably help me level up.19:14:02
@emilazy:matrix.orgemilydiving into the deep end is the best way to learn :P19:15:43
@emilazy:matrix.orgemilyI'm happy to try and give pointers for anything that comes up but my available proper-review time is pretty limited sadly19:16:02
@msgilligan:matrix.orgmsgilligan That is so true! But it does take time. 19:16:05
@emilazy:matrix.orgemilyyeah for sure I don't want to trivialize the learning curve19:16:16
@emilazy:matrix.orgemilyI have a vested interest in believing Darwin package porting is fairly easy these days since I was involved in the 24.11 rework 😅19:16:46
@msgilligan:matrix.orgmsgilliganVested interests in getting the right thing done are good!19:17:10
@msgilligan:matrix.orgmsgilligan

In the short term, I'm going to focus on getting binary JDK 25 (probably Zulu) and GraalVM 25 (probably Oracle) working in Nixpkgs. And also the JDK Dashboard tool, which seems like a cool way for me to learn more about Nix programming since it seems to basically require two things:

  1. Learning how to pull information about packages out of Nixpkgs
  2. Learning how to process attribute sets with various functional transforms
19:20:28
@emilazy:matrix.orgemilyI would recommend Temurin, if you had to pick (because it'll be needed for the source bootstrap later)19:21:09
@emilazy:matrix.orgemilythough it's still a way aways from being stable right?19:21:26
@msgilligan:matrix.orgmsgilliganActually 25 EA is pretty stable now, in my experience.19:21:46
@msgilligan:matrix.orgmsgilligan One of the things I'm doing is writing an FFM ("Panama") wrapper for a C' library, calling it from a Java tool/library, and then compiling the tool with native-image. In order for all this to work correctly on aarch64` GraalVM 25 is required. 19:23:13
@msgilligan:matrix.orgmsgilligan * One of the things I'm doing is writing an FFM ("Panama") wrapper for a C library, calling it from a Java tool/library, and then compiling the tool with native-image. In order for all this to work correctly on aarch64\ GraalVM 25 is required. 19:23:30
@msgilligan:matrix.orgmsgilligan * One of the things I'm doing is writing an FFM ("Panama") wrapper for a C library, calling it from a Java tool/library, and then compiling the tool with native-image. In order for all this to work correctly on aarch64 GraalVM 25 is required. 19:23:40
@msgilligan:matrix.orgmsgilligan

I personally think 25 is a big milestone release for the JDK. The FFM stuff is really cool for many reasons. And finally the hello world program is reduced to:

void main() {
    IO.println("Hello, World!");
}
19:26:24
@msgilligan:matrix.orgmsgilligan

I used to think that making "hello world" simpler wasn't a big deal, but it is important in 3 ways:

  1. Makes it less intimidating for new devs to learn Java
  2. Helps with changing the obsolete view that Java is verbose
  3. Greatly simplifies the sample code you have to write for your libraries
19:30:11
@infinidoge:inx.moeInfinidoge 🏳️‍⚧️More importantly for me, it makes Java a lot more viable as a 'scripting' language19:30:40
@infinidoge:inx.moeInfinidoge 🏳️‍⚧️You no longer need to have a mountain of boilerplate just to do something simple19:30:54

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