A new Oracle GlassFish Server 3.0.1 container System Provider Interface (SPI) defines interfaces that a container developer must implement so that GlassFish Server can call into it at appropriate times. This change enables GlassFish Server users to customize GlassFish Server by adding administrative commands and graphical add-on components.
GlassFish Server also provides streamlined support of new module types, such as Ruby on Rails.