### Author:  [@tobiasBora](https://discourse.nixos.org/u/tobiasBora)
#### Post date: [July 1, 2022, 10:50pm UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/1 "2022-07-01T22:50:22Z")
I’d like to use quarkus and I wanted to follow this [Get Started - Quarkus](https://quarkus.io/get-started/). As I understand, to install quarkus, I need to use `jbang` that will pick the CLI program in Maven’s repository. However, if I do:
```auto
$ nix-shell -p jbang
$ jbang app install --fresh --force quarkus@quarkusio
[jbang] Command installed: quarkus
[...]
$ quarkus --version
quarkus: command not found
```
How could I solve this problem?
–EDIT–
Seems like doing `$ export PATH=~/.jbang/bin/:$PATH` solves the problem. Couldn’t we configure nix-shell to do that automatically?
–EDIT2–
Can I somehow specify in a nix-shell “install jbang and from jbang install quarkus”? For now I’m doing this:
```auto
{pkgs ? import {} }:
pkgs.mkShell {
packages = with pkgs; [jbang];
shellHook = ''
echo ">>>> Making sure quarkus is installed"
jbang app install --fresh --force quarkus@quarkusio
echo ">>>> Updating PATH"
export PATH=~/.jbang/bin/:$PATH
echo ">>>> You can start the debug mode via 'quarkus dev' (this project was created via 'quarkus create')."
'';
}
```
but it does not seem to be really optimized (and there is no guarantee that the quarkus version will match between multiple users I guess)
---
### Author:  [@emmanuelrosa](https://discourse.nixos.org/u/emmanuelrosa)
#### Post date: [July 1, 2022, 11:22pm UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/2 "2022-07-01T23:22:37Z")
If you use JBang, it will install whatever version it decides to. You can just get quarkus directly from Github
[Releases · quarkusio/quarkus · GitHub](https://github.com/quarkusio/quarkus/releases)
That way you can build a normal Nix package.
---
### Author:  [@tobiasBora](https://discourse.nixos.org/u/tobiasBora)
#### Post date: [July 2, 2022, 12:36am UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/3 "2022-07-02T00:36:42Z")
Thanks. So basically, JBang is the quick and dirty, and packaging is the clean and long approach. So I tried to write this:
```auto
# This method is the simplest, but not the cleanest (download the whole maven dependency in one output)
# https://nixos.org/manual/nixpkgs/stable/#maven
{ stdenv, maven, lib, fetchFromGitHub }:
stdenv.mkDerivation rec {
name = "quarkus-${version}";
version = "2.10.1.Final";
src = fetchFromGitHub {
owner = "quarkusio";
repo = "quarkus";
rev = "${version}";
sha256 = "sha256-OUxVkKFqAEwWQiwvVJfetHC0nEPARvYXpeu8bKSVu7M=";
};
buildInputs = [maven];
buildPhase = ''
mvn package -Dmaven.repo.local=$out -Dmaven.test.skip=true
'';
# keep only *.{pom,jar,sha1,nbm} and delete all ephemeral files with lastModified timestamps inside
installPhase = ''
find $out -type f \
-name \*.lastUpdated -or \
-name resolver-status.properties -or \
-name _remote.repositories \
-delete
'';
# don't do any fixup
dontFixup = true;
outputHashAlgo = "sha256";
outputHashMode = "recursive";
# replace this with the correct SHA256
outputHash = lib.fakeSha256;
meta = {
description = "";
homepage = https://github.com/quarkusio/quarkus;
# license = stdenv.lib.licenses.;
# maintainers = [stdenv.lib.maintainers.];
# platforms = stdenv.lib.platforms.;
};
}
```
unfortunately a test appears to fail (`gRPC - Stubs for health and reflection `), but I can’t find how to disable tests (sorry, I’m very new to the Java ecosystem). Using `-Dmaven.test.skip=true` does not solve the problem.
---
### Author:  [@tobiasBora](https://discourse.nixos.org/u/tobiasBora)
#### Post date: [July 2, 2022, 8:51am UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/4 "2022-07-02T08:51:14Z")
See this question where I give the precise error [Can't package Quarkus](https://discourse.nixos.org/t/cant-package-quarkus/20085)
---
### Author:  [@emmanuelrosa](https://discourse.nixos.org/u/emmanuelrosa)
#### Post date: [July 2, 2022, 6:45pm UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/5 "2022-07-02T18:45:00Z")
Building Java programs with Nix is a nightmare. I got the compiled jar to work with this self-contained example:
**quarkus-cli.nix**
```auto
{ pkgs ?
}:
let
quarkus-cli = { stdenv, fetchurl, writeScript, bash, openjdk }:
stdenv.mkDerivation rec {
pname = "quarkus-cli";
version = "2.10.1.Final";
src = fetchurl {
url = "https://github.com/quarkusio/quarkus/releases/download/2.10.1.Final/${pname}-${version}.tar.gz";
sha256 = "0cl641g5vgw94ac7sj8mhz21s6rkjdfjdzhh02dq64cd5cxwcmc5";
};
launcher = writeScript pname ''
#! ${bash}/bin/bash
export CLASSPATH=@LIB@/${pname}-${version}-runner.jar
exec ${openjdk}/bin/java $JAVA_OPTS -classpath $CLASSPATH -Dapp.name="quarkus" -Dapp-pid="$$" -Dapp.repo="@LIB@" -Dapp.home="@OUT@" -Dbasedir="@OUT@" io.quarkus.cli.Main "$@"
'';
installPhase = ''
mkdir -p $out/{lib,bin}
cp ./lib/${pname}-${version}-runner.jar $out/lib
cp ${launcher} $out/bin/${pname}
substituteInPlace $out/bin/${pname} --replace @LIB@ $out/lib --replace @OUT@ $out
'';
};
in
(import pkgs {}).callPackage quarkus-cli {}
```
---
### Author:  [@tobiasBora](https://discourse.nixos.org/u/tobiasBora)
#### Post date: [July 2, 2022, 8:41pm UTC](https://discourse.nixos.org/t/run-a-program-from-maven-using-jbang/20082/6 "2022-07-02T20:41:30Z")
Thanks a lot!! (your trick with `@OUT@` is also funny) Too bad compiling is not easy (I’ll read now the other conversation for that) But your solution is actually more interesting from a practical point of view as it does not compile anything and is therefore close to instantaneous. Note however that to make it work, you need to have `export JAVA_HOME="${openjdk}"` before the `exec`, otherwise the application won’t compile when running it `with quarkus-cli dev`.