Excellent Java Enterprise API support. Features dynamic clustering of EJB components as well as web pages. Runs on a wide variety of platforms. Does not feature an XML parser. If you're looking for wizards and GUIs, you had best look elsewhere.
Excellent administration interfaces.
The included Java realtional database, JDatastore, is useful for development, testing and small applications. Supports a limited number of platforms. Does not yet feature integrated XML support. Supports latest Java Development Kit, but doesn't include it on the installation disk.