getting error message “Failed to load resource: the server responded with a status of 404 (Not Found)”

Question

I have a simple MVC web application, which was running locally without problems 3 weeks ago.

When I now open the application in Netbeans and run it, everything seems

Answer 1

Ok, I now found out how to run the app locally without problems: by creating a .war file instead of a .jar file - now I can run the app again without problems.