About your first question, if you "touch" your web.xml file in the WAR exploded 
dir, then JBoss redeploys that WAR. If using linux, it's easy to do it with the 
"touch" command; in windows I know there are some free utilities that do this, 
but don't know where you can get them (a home-made solution would be to edit 
the web.xml file and force it saving it with Save As command, for example).
About the second question... Well, it does depend on various factors. If you 
use interfaces to access your common libraries and the interfaces aren't 
changed, then I think it's possible to modify them without restarting the 
dependent WARs, but not really sure of how to make this possible. On the other 
hand, if you don't use interfaces or your interfaces are changed, then the 
dependent WARs must be redeployed in order to access the new classes/interfaces.
Be advised that I'm not really sure about my answers because they are based on 
the J2EE spec, the JBoss code I could understand and my experience, so I'm sure 
someone from JBoss can answer better your questions, but maybe my answers 
helped you someway...


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