Java EE (Java Enterprise Edition) General Discussion

1) Can I specify multiple war files within a single <web-app>
So 1 web-app => 1 servlet context => 1 war file. Why can't I
districute the app in multiple wars all within the same context?
Is this a requirement of the J2ee spec

2) I have a big "WAR" file to which I want to add small "custom" code
whats the best way of deploying this without having to deploy the big
WAR file. If from 1) above I could deploy multiple wars in the same
servlet context then this would not be a problem.

3) Is there a concept of "WAR groups" when you can create
a group of related wars that share the same servletcontext.

I am not sure if J2EE spec allows 1,2,3, if not its a serious oversight because I cannot re-use code across web-applications.