testin reference to:
"So in this case we have installed Hibernate as object-relational mapping (ORM)-provider. Hibernate is one of three ORM providers which Roo currently offers. EclipseLink and OpenJPA represent the alternative choices. In a similar fashion we have chosen the Hypersonic in-memory database database as our target database. Hypersonic is a convenient database for Roo application development because it relieves the developer from having to install and configure a production scale database."
- Chapter 2. Beginning With Roo: The Tutorial (view on Google Sidewiki)