There is a lot of interest in the server-side Java community around using ahead of time (AOT) native compilation provided by Graal Substrate VM to drive down memory usage and cold start times of Java microservices. While these frameworks are technically interesting, the claim is if you spend time rewriting your Jakarta EE applications to utilize these new frameworks, then you will substantially reduce your cloud operational costs. First, by enabling the adoption of a serverless deployment model and second, by reducing your containers' memory usage.
Cold Starts Mean You Need AOT to do Serverless
Some History
If you were developing web applications in the early 1990s, you used CGI scripts to build data-driven and interactive web applications. The execution model of CGI was: