From: <glassfish_at_javadesktop.org>
Date: Thu, 01 Jul 2010 05:32:05 PDT

If i left the context-root defined as / i got the following error deploying EAR:

Unable to deploy web module [MyApplication:MyModule.war] at context root [] on virtual server [notikumi], because this virtual server declares a default-web-module|#]

and app is not deployed.
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http://forums.java.net/jive/thread.jspa?messageID=476507