This is the sample project to run on heroku with springboot.
After cloning this project in your local machine, go to this file
HelloWorldOnHeroku/src/main/java/com/owen/springboot/helloworldonheroku/HelloworldonherokuApplication.java
and right click the file and run this java application.
Go to this url to see if you can see the page:
localhost:8080
Once you can see the page on your local, then, it's time to test on heroku.
You can create a new app on heroku and link your github repository.
Once you linked to your github, then you can deploy on heroku.
Here is the screenshot:
https://deanmalone.net/post/how-to-fork-your-own-repo-on-github/