Capsule does not resemble servlet containers and WAR files at all. You can think of Capsule as a fat jar that always works and contains a startup script (which is declarative and placed in the JAR's manifest). It is a packaging solution. It isn't a deployment format (like a WAR), but a JAR that can configure the JVM that runs it.

And while the word "container" is used here, we mean a different kind of containers -- those that give you virtualization and app isolation at the OS level[1]. So there is no container -- like a sevlet container -- that hosts multiple applications, and no specific programming model.

[1]: https://en.wikipedia.org/wiki/Operating-system-level_virtual...