[Vuejs]-Deploying Spring Boot Using Vue.js to Heroku builds successfully, but doesn't start

The issue was that my project structure was not supported by the default Procfile configuration that was looking in target/my-jar-file.jar, and needed to be changed for my unusual project structure: backend/target/my-jar-file.jar.

web: java -jar backend/target/my-jar-file.jar in a Procfile at the root of my application.