Blogging after ages for something I haven't found from multiple web searches. Something that might be useful for others
After you've installed tomcat9, do the following:
sudo apt-get install tomcat9
sudo touch /var/log/tomcat9/catalina.out
sudo chown syslog:adm /var/log/tomcat9/catalina.out
sudo usermod -a -G tomcat syslog
sudo chmod 770 /var/log/tomcat9
sudo systemctl restart rsyslog
sudo service tomcat9 restart
Now you'll be able to follow your logs just like previous installations
sudo tail -f /var/log/tomcat9/catalina.out