traping_signal.sh

#!/usr/bin/env bash
set -x

pid=0

sigterm_handler() {
  echo "sigterm handler called..."
  if [ $pid -ne 0 ]; then
    kill -TERM "$pid"
    echo "scala application terminated..."
    wait "$pid"
  fi
  exit 143;
}

trap 'kill ${!}; sigterm_handler' TERM

#running scala application
sbt run &
pid="$!"
echo "PID=$pid"

# wait forever
while true
do
  tail -f /dev/null & wait ${!}
done

set +x