Java snap application is not able to play sounds (core24)

snapcraft
9

I discovered that the interface pulseaudio was deprecated: The pulseaudio interface

So i replaced it with sound-playback and now my application is able to play sounds!

Thank you again James! You have led me on the right path.

For completeness I am sharing the working yaml file:

name: fromgtog
version: '7.0.1'
summary: Clone ALL GitHub/Gitea/Local to GitHub/Gitea.
description: |
  Helps to clone all repositories from GitHub on Gitea/Local and vice versa.
grade: stable
confinement: strict
base: core24
icon: snap/gui/icon.png
title: FromGtoG
website: https://andre-i.eu
issues: https://github.com/goto-eof
license: MIT
compression: xz
slots:
  fromgtog-dbus:
    interface: dbus
    bus: session
    name: it.es5.fromgtog.dbus
apps:
  fromgtog:
    environment:
      ALSA_CONFIG_PATH: $SNAP/etc/asound.conf
      LD_LIBRARY_PATH: $LD_LIBRARY_PATH:$SNAP_DESKTOP_RUNTIME/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/libproxy:$SNAP_DESKTOP_RUNTIME/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gio/modules
    command: executor
    extensions: [ gnome ]
    plugs:
      - network
      - x11
      - browser-support
      - unity7
      - home
      - desktop
      - desktop-legacy
      - removable-media
      - wayland
      - network-bind
      - audio-playback
      - alsa
    slots:
      - fromgtog-dbus
platforms:
  amd64:
    build-on: [ amd64 ]
    build-for: [ amd64 ]
  arm64:
    build-on: [ arm64 ]
    build-for: [ arm64 ]
parts:
  wrapper:
    plugin: dump
    source: snap/local
    source-type: local
  alsa-config:
    plugin: dump
    source: snap/local/asound.conf
    source-type: file
    organize:
      asound.conf: etc/asound.conf
    prime:
      - etc/asound.conf
  application:
    plugin: maven
    source: .
    build-packages:
      - openjdk-21-jdk
      - maven
    stage-packages:
      - openjdk-21-jre
      - glib-networking
      - libgtk-3-0
      - xdg-utils
      - libasound2
      - libasound2-plugins
      - alsa-utils
    after:
      - alsa-config
    override-prime: |
      snapcraftctl prime
      rm -vf usr/lib/jvm/java-*-openjdk-*64/lib/security/blacklisted.certs

While in Java I do something like that to load the clip:

    private Clip loadClip(String soundFilename) {
        try {
            InputStream soundStream = SoundPlayer.class.getResourceAsStream(soundFilename);
            URL soundURL = getClass().getClassLoader().getResource(soundFilename);
            if (soundURL == null) {
                logger.error("File not found: {}", soundFilename);
                return null;
            }
            logger.info("Loading file: {}", soundFilename);
            AudioInputStream audioStream = AudioSystem.getAudioInputStream(soundURL);
            Clip clip = AudioSystem.getClip();
            clip.open(audioStream);
            audioStream.close();
            return clip;
        } catch (RuntimeException | UnsupportedAudioFileException | IOException |
                 LineUnavailableException e) {
            logger.error("SoundPlayer failed to load clip", e);
        }
        return null;
    }
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