License not working inside snap

snapcraft
1

Hi,
we’ve developed a Java application for face recognition with the help of third party SDK. The application needs license from the third party SDK to run. The license should be running as a separate instance in the installed machine.
After the packaging the application along with the dependencies and licenses using snap, Our Java application is not detecting the running license instance.
The License file will be run through the shell script which is provided by the SDK, will be running locally on port 5000.
Should we have follow any other steps while packaging the application particularly for this type of licensing?

I've attached my snapcraft.yaml file below

name: facecheck # you probably want to 'snapcraft register <name>'
base: core18 # the base snap is the execution environment for this snap
version: '1.0' # just for humans, typically '1.2+git' or '1.3.2'
summary: Face recognition # 79 char long summary
description: |
  This application is used to recognise and detect the persons face
  with the enrolled data from database.

grade: devel # must be 'stable' to release into candidate/stable channels
confinement: devmode # use 'strict' once you have the right plugs and slots

apps:
  facecheck:
    command: usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -jar $SNAP/Bin/Java/simple-surveillance-application.jar
    environment:
      JAVA_HOME: $SNAP/usr/lib/jvm/java-1.8.0-openjdk-amd64
      PATH: $JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
      LD_LIBRARY_PATH: $SNAP/Lib/Linux_x86_64
    plugs: [desktop, home, camera, x11, desktop-legacy, opengl, alsa, pulseaudio]
    autostart: Facecheck-surveillance.desktop

parts:
  facecheck:
    # See 'snapcraft plugins'
    source: .
    plugin: dump
    build-packages: 
    - nvidia-384-dev
    - libgtk-3-dev
    - gstreamer1.0-vaapi
    - vainfo
    - openjdk-8-jre
    - openjdk-8-demo
    - libgdk-pixbuf2.0-dev
    - alsa-utils
    - libasound2-data
    - libasound2-plugins
    - libasound2
    - libopus-dev
    - libortp-dev
    - gcc
    - g++
    - make
    - libgudev-1.0-0
    - libgudev-1.0-dev 
    - libgstreamer1.0-0 
    - gstreamer1.0-plugins-base 
    - gstreamer1.0-plugins-good 
    - gstreamer1.0-plugins-bad 
    - gstreamer1.0-plugins-ugly 
    - gstreamer1.0-libav 
    - gstreamer1.0-doc 
    - gstreamer1.0-tools 
    - gstreamer1.0-x 
    - gstreamer1.0-alsa 
    - gstreamer1.0-gl 
    - gstreamer1.0-gtk3 
    - gstreamer1.0-qt5 
    - gstreamer1.0-pulseaudio
    # - libgstreamer0.10-dev
    # - libgstreamer-plugins-base0.10-dev
    - libfontconfig1-dev 
    - libfreetype6-dev 
    - libpng-dev
    - libcairo2-dev 
    - libjpeg-dev 
    - libgif-dev
    - libgstreamer-plugins-base1.0-dev
    - python-gst-1.0 
    - python3-gst-1.0
    - postgresql
    - postgresql-contrib
    - odbc-postgresql
    - unixodbc
    - unixodbc-dev
    - build-essential
    - manpages-dev
    stage-packages:
    - libgpm2
    - libslang2 
    - libnvidia-compute-390
    - openjdk-8-jre
    - openjdk-8-demo
    - nvidia-384-dev
    - libgtk-3-dev
    - gstreamer1.0-vaapi
    - vainfo
    - libgdk-pixbuf2.0-dev
    - alsa-utils
    - libasound2-data
    - libasound2
    - libasound2-plugins
    # - libopus
    # - libortp
    - gcc
    - g++
    - make
    - libgudev-1.0-0
    - libgudev-1.0-dev
    - libgstreamer1.0-0 
    - gstreamer1.0-plugins-base 
    - gstreamer1.0-plugins-good 
    - gstreamer1.0-plugins-bad 
    - gstreamer1.0-plugins-ugly 
    - gstreamer1.0-libav 
    - gstreamer1.0-doc 
    - gstreamer1.0-tools 
    - gstreamer1.0-x 
    - gstreamer1.0-alsa 
    - gstreamer1.0-gl 
    - gstreamer1.0-gtk3 
    - gstreamer1.0-qt5 
    - gstreamer1.0-pulseaudio
    # - libgstreamer0.10-dev
    # - libgstreamer-plugins-base0.10-dev
    - libfontconfig1-dev 
    - libfreetype6-dev 
    - libpng-dev
    - libcairo2-dev 
    - libjpeg-dev 
    - libgif-dev
    - libgstreamer-plugins-base1.0-dev
    - python-gst-1.0 
    - python3-gst-1.0
    - postgresql
    - postgresql-contrib
    - odbc-postgresql
    - unixodbc
    - unixodbc-dev
    - build-essential
    - manpages-dev
2

If the license server is directly spawned by your application and it wants to create a listening socket, then you’d need to plug network-bind. If that doesn’t help, try checking the output of dmesg to see if there are any relevant denial messages.

3

Sorry for late reply,

Even after adding network-bind plug, my license not getting recognised. I don’t see any relevant message in dmesg also. Is there any other option available for this?

Also I’m having a configuration file for the java application, where some important details will be placed, so that the client can be replace them for their needs. But after packaging, inside the snap folder the file is in [Read only] format. How can I edit the configuration file after packaging?