Jaffa v2.1 is a not only a maintenance release, but also introduces many new features. In conjunction with this release new versions of the sub-projects (JaffaBaseline, JaffaComponents and Example1) have been updated to make use of these new features.
The full details of what has been added since v2.0 are available in the release notes, but the most notable ones are
Native Tomcat 5.0 support, including jsp precompiling
Full relational integrity supported in the v1.1 domain pattern
New bean moulding framework for updating and retrieving graphs of domain objects, idea for complex web services
Two new database schema importers, we can now import domain models from the database schema, ErWin CASE tool as well as Uniface