Thanks for this very good post, really I’m enjoying it.
On the Apache Tomcat Section, there is a little typo :
Create a general main class to run the application programticially.
I guess that at the end you wanted to type programmatically.
Up there you will see some links that refer to the repo, here is the GitHub link of the full source code: https://github.com/dassiorleando/gistology Please also go through the recommendation area up there to run all smoothly.