From: <glassfish_at_javadesktop.org>
Date: Fri, 24 Jul 2009 10:24:45 PDT

Yes. From the release notes:

Web Container
    * Sun GlassFish Enterprise Server v2.1
Note –
Other versions of Sun GlassFish will work with Web Space Server, such as GlassFish v3 Prelude, but are recommended for evaluation or testing purposes only, rather than a production environment.

http://docs.sun.com/app/docs/doc/820-7053/ghmay?a=view
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