Not without more information. There are lots of things that can be cached, and there are lots of cache mechanisms to cache them. I have no idea what "caching a WAR" would even mean, since a WAR is just the code and resources for a web application.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.