From: <glassfish_at_javadesktop.org>
Date: Tue, 06 Apr 2010 12:45:32 PDT

Some methods are not implemented - such as entries(String), getSubArchive(String) etc. which would cause different cases to fail. This is planned to be fixed in 3.1.
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http://forums.java.net/jive/thread.jspa?messageID=395574