From: <webtier_at_javadesktop.org>
Date: Wed, 20 Jan 2010 13:24:15 PST

Fixed it by using immediate="true" - bypassing validation when logging out ...

<h:commandButton value="Goodbye" immediate="true" action="#{welcome.goodbye}" />
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http://forums.java.net/jive/thread.jspa?messageID=382032