You encounter problems when installing.
The Enterprise Server installation requires JDK 5 or JDK 6, so check your system for that dependency. Make sure that the JDK 5 or JDK 6 release bin directory is in your PATH so that the java binary used with Enterprise Server comes from the JDK release rather than a JRE implementation. For more information about system requirements and dependencies, see the Sun GlassFish Enterprise Server v3 Prelude Release Notes. For complete installation information and guidelines, see the Sun GlassFish Enterprise Server v3 Prelude Installation Guide.
You cannot upgrade from Sun Java System Application Server 9.1 (GlassFish v2) to Enterprise Server v3 Prelude. No upgrade option is available.
Upgrade support is not provided in Enterprise Server v3 Prelude. You cannot upgrade from Sun Java System Application Server 9.1 (GlassFish v2) to Enterprise Server v3 Prelude.
For information about updating an existing Enterprise Server v3 Prelude installation, see Chapter 2, Updating an Existing Enterprise Server v3 Prelude Installation, in Sun GlassFish Enterprise Server v3 Prelude Installation Guide.