What is wrong with my web apps? They run on my system but not on Azure.

I've deployed 4-5 simple web apps to Azure Web Apps and to Azure Spring Cloud. They work on my system localhost:8080 but they fail on Azure. They show as running but return 404 when I navigate to listed url.
The code for the the current example is here: https://github.com/MikeDodaroZen/time-demo
You can: git clone https://github.com/MikeDodaroZen/time-demo.git
Try building the jar or war file with Maven
mvn clean package
Then run the app: java -jar target/time-demo-0.0.1.jar
Test on localhost:8080
Then deploy the jar or war to Azure Web Apps and see if you can get it to run.