Problems demonizing Java process on Debian

Question

I'm trying to turn Serviio into a service on Debian, to enable it to start at boot and to be controlled with the service command line utility.

I have a dedicated user, serviio, to run the daemon. I temporarily gave this user a shell and logged in to start the daemon as this user and confirm it works as it should, so it isn't an issue related to that.

This is the script I am using, in /etc/init.d/serviio. This script is from the serviio forums and everyone is reporting success with it for years now as recently as this month.

#!/bin/bash
#
#########################################################
#- Daemon script for Serviio media server
#- By Ian Laird; converted for Debian by Jacob Lundbergand edited by Jopie
#- /etc/init.d/serviio
#########################################################
#
### BEGIN INIT INFO
# Provides:          serviio
# Required-Start:    $local_fs $remote_fs $network $syslog
# Required-Stop:     $local_fs $remote_fs $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# X-Interactive:     true
# Short-Description: Start/stop serviio media server
# Description:       The Serviio media server makes your media available to
#                    all kinds of networked devices.
### END INIT INFO


. /lib/lsb/init-functions

if [ -f /etc/default/serviio ]; then
        . /etc/default/serviio
fi


DAEMON_STOP=" -stop"
NAME="$(basename $0)"
PIDFILE="/tmp/serviiod.pid"
TIMEOUT=10

if [ -f /etc/default/serviio ]; then
        . /etc/default/serviio
fi

[ -x "$DAEMON" ] || exit 0


running() {
        if [ "x$1" == "x" ]; then
                echo 0
                return 1
        fi

        PS=$(ps h -p $(echo $1 | sed -r 's/[\t \n]+/ -p /') | wc -l)
        echo $PS

        if [ $PS -gt 0 ]; then
                return 0
        else
                return 1
        fi
}


start() {
        log_daemon_msg "Starting Serviio media server daemon" "$NAME"
        start-stop-daemon --start -q -b -p "$PIDFILE" -m -c "${SERVICE_ACCOUNT}" -x "${DAEMON}" start
        log_end_msg $?
}

stop() {
        log_daemon_msg "Stopping Serviio media server daemon" "$NAME"
        if [ -r "$PIDFILE" ]; then
                PIDS=$(pstree -p $(<"$PIDFILE") | awk -F'[\(\)]' '/^[A-Za-z0-9]/ { print $2" "$4; }')
                if running "$PIDS" > /dev/null; then
                        "${DAEMON}" "${DAEMON_STOP}"
                        for PID in $PIDS; do
                                if running $PID > /dev/null; then
                                        kill -TERM $PID
                                fi
                        done
                fi
                COUNTDOWN=$TIMEOUT
                while let COUNTDOWN--; do
                        if ! running "$PIDS" > /dev/null; then
                                break
                        fi
                        if [ $COUNTDOWN -eq 0 ]; then
                                for PID in $PIDS; do
                                        if running $PID > /dev/null; then
                                                kill -KILL $PID
                                        fi
                                done
                        else
                                echo -n .
                                sleep 1
                        fi
                done
        fi

        if running "$PIDS" > /dev/null; then
                log_end_msg 1
        else
                rm -f "$PIDFILE"
                log_end_msg $?
        fi
}

status() {
        echo -n "$NAME should be"
        if [ -r "$PIDFILE" ]; then
                echo -n " up with primary PID $(<"$PIDFILE")"
                PIDS=$(pstree -p $(<"$PIDFILE") | awk -F'[\(\)]' '/^[A-Za-z0-9]/ { print $2" "$4; }')
                RUNNING=$(running "$PIDS")
                if [[ $RUNNING && $RUNNING -gt 0 ]]; then
                        echo -n " and $RUNNING processes are running."
                else
                        echo -n " but it is not running."
                fi
        else
                echo -n " stopped."
        fi
        echo
}


case "${1:-}" in
        start)
                start
        ;;
        stop)
                stop
        ;;
        restart)
                stop
                start
        ;;
        status)
                status
        ;;
        *)
                log_success_msg "Usage: /etc/init.d/$NAME {start|stop|restart|status}"
                exit 1
        ;;
esac

exit 0

I also have in /etc/default/serviio

NAME="Serviio Media Server"
DAEMON="/opt/Serviio/bin/serviio.sh"    ## Update this to point at serviio_root/bin/serviio.sh
SERVICE_ACCOUNT="serviio" ## DON'T RUN UNDER ROOT!

I added the service to the system using the appropriate service commands.

However, whenever I try to start the service...systemd report it as starting successfully, but the daemon does not actually run. No error messages are report.

Running the script manually from /etc/init.d/serviio start also does not work.

How can I troubleshoot and fix this issue?