JBoss AS doesn't have that kind of feature. But you could implement that in an application of yours. But I don't see the advantage of storing the war in a database as a blob.
What you want to achieve?
For distributed deployment you might use the farming feature.
And with AS7 there is a nice domain model that do the work for you and it should fit if you using a webapp with the web-profile.
what i want to achieve?
I have this requirement to create a Portal that allows Users to create apps(portlet) a user should be able to upload a App in runtime and should be able to run the app, There might be thousands of Apps hence the need for storage location that keeps tabs of the apps, One solution i have in mind is to modify Jboss itself but i am open to other ideas