From: Yannick Eyebe <yannickeyebe_at_yahoo.fr>
Date: Fri, 6 May 2011 09:54:43 +0100 (BST)

Hi,
Imagine a web application developped with JEE that works in a compagny. After
 a few months we need to do an update to add new features(new version of the
application) without interrupting the operation of this application.How can I do
that? Can I have a simple screencast example, please?.The solution must be free.