When a session is destroyed, the SingleSignOn valve receives a notification. It 
 checks the destroyed session to see whether its maxInactiveInterval has been 
surpassed.  If so, it assumes the session was destroyed due to timeout, and 
other sessions associated with the sso are not invalidated.  If the 
maxInactiveInterval was not exceeded, it assumes the session was destroyed due 
to a deliberate call to session.invalidate().  In this case, the other sessions 
associated with the sso are also invalidated.

There is a problem this approach, namely that if an app is undeployed, all its 
sessions are destroyed, probably before their maxInactiveInterval has passed.  
The sso valve will interpret this as a conscious invalidation and will 
terminate all associated sessions.  So, undeploying a webapp will have the 
effect of terminating all sso sessions associated with the app.  See 
http://jira.jboss.com/jira/browse/JBAS-2429.

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