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

• Make sure JAVA 8 is running on your laptop
• Get Tomcat 8 - prefer the Core > Zip from here
• Configure under /conf/tomcat-users.xml the code below
• Restart tomcat /bin/shutdown.sh & startup.sh
• Application URL is http://localhost:8080/helloworld/

<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>