How to use Java Jogl on NixOS: loading gluegen_rt

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1

Hello,
I have a computer graphics course in java using OpenGL, but I can’t get any code to run, I get this:

+ JARDIR=./jars
+ javac -cp ./jars/gluegen-rt.jar:./jars/jogl-all.jar:./jars/joml-1.10.8.jar Cli.java Main.java MainView.java OpenGLManager.java
+ java -cp ./jars/gluegen-rt.jar:./jars/gluegen-rt-natives-linux-amd64.jar:./jars/gluegen-rt-natives-macosx-universal.jar:./jars/gluegen-rt-natives-windows-amd64.jar:./jars/jogl-all.jar:./jars/jogl-all-natives-linux-amd64.jar:./jars/jogl-all-natives-macosx-universal.jar:./jars/jogl-all-natives-windows-amd64.jar:./jars/joml-1.10.8.jar:. Main
Warning: Caught Exception while retrieving executable temp base directory:
java.io.IOException: Could not determine a temporary executable directory
	at com.jogamp.common.util.IOUtil.getTempDir(IOUtil.java:1362)
	at com.jogamp.common.util.cache.TempFileCache.<clinit>(TempFileCache.java:84)
	at com.jogamp.common.util.cache.TempJarCache.initSingleton(TempJarCache.java:96)
	at com.jogamp.common.os.Platform$1.run(Platform.java:313)
	at com.jogamp.common.util.SecurityUtil.doPrivileged(SecurityUtil.java:80)
	at com.jogamp.common.os.Platform.<clinit>(Platform.java:290)
	at com.jogamp.opengl.GLProfile.<clinit>(GLProfile.java:151)
	at OpenGLManager.<init>(OpenGLManager.java:37)
	at Main.main(Main.java:6)
Exception in thread "main" java.lang.UnsatisfiedLinkError: Couldn't load library 'gluegen_rt' generically including [], nor as [/usr/java/packages/lib/libgluegen_rt.so, /usr/lib64/libgluegen_rt.so, /lib64/libgluegen_rt.so, /lib/libgluegen_rt.so, /usr/lib/libgluegen_rt.so, /home/matteob/Code/uni/ICGV-assignments/assignment2_templates/ex1_1/libgluegen_rt.so, /home/matteob/Code/uni/ICGV-assignments/assignment2_templates/ex1_1/natives/linux-amd64/libgluegen_rt.so]
	at com.jogamp.common.jvm.JNILibLoaderBase.loadLibraryInternal(JNILibLoaderBase.java:634)
	at com.jogamp.common.jvm.JNILibLoaderBase.access$000(JNILibLoaderBase.java:64)
	at com.jogamp.common.jvm.JNILibLoaderBase$DefaultAction.loadLibrary(JNILibLoaderBase.java:107)
	at com.jogamp.common.jvm.JNILibLoaderBase.loadLibrary(JNILibLoaderBase.java:488)
	at com.jogamp.common.os.DynamicLibraryBundle$GlueJNILibLoader.loadLibrary(DynamicLibraryBundle.java:427)
	at com.jogamp.common.os.Platform$1.run(Platform.java:321)
	at com.jogamp.common.util.SecurityUtil.doPrivileged(SecurityUtil.java:80)
	at com.jogamp.common.os.Platform.<clinit>(Platform.java:290)
	at com.jogamp.opengl.GLProfile.<clinit>(GLProfile.java:151)
	at OpenGLManager.<init>(OpenGLManager.java:37)
	at Main.main(Main.java:6)

Here’s the flake for the dev shell:

{
  description = "";
  inputs =
    {
      nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    };
  outputs = { self, nixpkgs, ... }@inputs:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
    in
    {
      devShells.${system}.default =
        pkgs.mkShell
          {
            nativeBuildInputs = with pkgs; [
              jdk
              jogl
              jdt-language-server
              libGL
            ];
            shellHook = ''
              export NIX_LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath [ pkgs.libGL pkgs.jogl ]}
              echo $NIX_LD_LIBRARY_PATH
              '';
          };
          
    };
}

I added this to my config:

    programs.nix-ld.enable = true; # allow for clangd dynamic linked libraries
    programs.nix-ld.package = pkgs.nix-ld-rs;
    programs.nix-ld.libraries = with pkgs; [ stdenv.cc.cc pkgs.libGL pkgs.jogl];

doesn’t help

I think that the error is because it’s trying to do some dynamic linking with system packages, which isn’t how nix is supposed to work. idealy I’d like to be able to fix this with the dev shell flake, instead of having to make system changes to nix-ld.

after some googling I found that this also uses joml: sweethome3d, but my knowledge of nix ends about here. I guess the answer might lie with pathelf? but I don’t know how it works.

2

Managed to get it to work:

flake.nix:

{
  description = "";
  inputs =
    {
      nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    };
  outputs = { self, nixpkgs, ... }@inputs:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
    in
    {
      devShells.${system}.default =
        pkgs.mkShell
          {
            nativeBuildInputs = with pkgs; [
              jdk
              jogl
              jdt-language-server
              libGL
              xorg.libXxf86vm
            ];
            shellHook = ''
              export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath [ pkgs.libGL pkgs.xorg.libXxf86vm]}:${pkgs.jogl}
              export JARDIR="${pkgs.jogl}/share/java/"
              '';
          };
          
    };
}

compile_and_run.sh:

#!/usr/bin/env bash

javac -cp "$JARDIR/gluegen-rt.jar:$JARDIR/jogl-all.jar:./jars/joml-1.10.8.jar" *.java

java -cp "$JARDIR/gluegen-rt.jar:$JARDIR/gluegen-rt-natives-linux-amd64.jar:$JARDIR/jogl-all.jar:$JARDIR/jogl-all-natives-linux-amd64.jar:./jars/joml-1.10.8.jar:." Main

(unsure if this is necessairy, but I have it on my system, so for completeness)

system config:

programs.nix-ld.enable = true;
programs.nix-ld.package = pkgs.nix-ld-rs;
programs.nix-ld.libraries = with pkgs; [ stdenv.cc.cc pkgs.libGL pkgs.jogl];
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