init.d script

myapp.sh

#!/bin/bash

### BEGIN INIT INFO
# Provides:  appstarted
# Required-Start:$all
# Required-Stop: $all
# Default-Start: 2 3 4 5
# Default-Stop:  0 1 6
# Short-Description: Starts application
# Description: Starts application
### END INIT INFO

APP="My Application"

start() {
  # Start your application
  java -jar /home/application/myapp.jar
}

stop() {
  # Stop your application
  kill $YOUR_APP_PID
}

case "$1" in
  start)
    echo "Starting $APP"
    start
    echo "$APP started."
    ;;

  stop)
    echo "Stopping $APP"
    stop
    echo "$APP stopped."
    ;;

  restart)
    echo  "Restarting $APP."
    stop
    sleep 2
    start
    echo "$APP restarted."
    ;;
  
  status)
    # Logic to check if application is running

  *)
    service_name=/etc/init.d/$APP
    echo "Usage: $service_name {start|stop|restart|status}" >&2
    exit 1
    ;;
esac

exit 0

where does $YOUR_APP_PID come from?