As the name suggests, the release is a prelude to Sun GlassFish Enterprise Server v3. It is not a full Java EE 5 application server, and not everything that was implemented in Sun Java System Application Server 9.1 (GlassFish v2) is implemented and functional in Enterprise Server v3 Prelude. You might be trying to do something that is not possible with the existing feature set. For more information about Enterprise Server v3 Prelude and the features it contains, consult the following resources:
Feature list and comparison: https://glassfish.dev.java.net/public/comparing_v2_and_v3.html
Download page: https://glassfish.dev.java.net/downloads/v3-prelude.html
Resources page: http://wiki.glassfish.java.net/Wiki.jsp?page=GlassFishV3PreludeResources
Documentation: http://docs.sun.com/coll/1343.7
Some resources refer to GlassFish v3 Prelude. GlassFish v3 Prelude is the community version of the commercially supported offering, Sun GlassFish Enterprise Server v3 Prelude. The software is the same; the difference is in support.