sample usage of syslog using syslog4j tested with java 1.8 (openjdk version "1.8.0_362")

client-syslog.sh

#!/bin/sh
#
# download package from http://syslog4j.org/
# check also https://manpages.ubuntu.com/manpages/xenial/man1/logger.1.html
#

java -cp syslog4j-0.9.46-bin.jar \
  org.productivity.java.syslog4j.server.SyslogServerMain \
  -h 127.0.0.1 \
  -p 9999 \
  udp \
  "hello world"

exit 0

server-syslog.sh

#!/bin/sh
#
# free firewall port udp/9999 =)
# download package from http://syslog4j.org/
#

java -cp syslog4j-0.9.46-bin.jar \
  org.productivity.java.syslog4j.server.SyslogServerMain \
  -h 0.0.0.0 \
  -p 9999 \
  -t 5000 \
  syslog.txt tcp

exit 0