In order to make it work, please do the following:

• Make sure JAVA 8 (JDK and not only JRE) or higher is running on your laptop
• Get Tomcat 9 - prefer the Core > Zip from here
• Configure under /conf/tomcat-users.xml the code below
• [LINUX / MAC] Make sure you have running permissions on the /bin/ directory and run chmod +x *.sh
• Restart tomcat /bin/shutdown.sh & startup.sh
• The Tomcat URL is http://localhost:8080/
• The application URL is http://localhost:8080/helloworld/
• Have fun!

<tomcat-users>
  <role rolename="manager-gui" />
  <role rolename="admin-gui" />
  <role rolename="manager-script" />
  <user username="admin" password="admin" roles="manager-gui,admin-gui,manager-script" />
</tomcat-users>

The workshop PPT can be downloaded from below link: https://drive.google.com/file/d/1q0PTkTGBH5Q4ODCfJSJekZJ2Js5v7Dzq/view?usp=sharing

Just a change to be able to make a pull request