H2, the Java SQL database. The main feature of H2 are:
- Very fast, free for everybody, source code is included
- Embedded, server and cluster modes
- JDBC and ODBC API; browser based Console application
- Written in Java; can be compiled with GCJ and IKVM.NET
- Small footprint: around 1 MB
A good option for testing purpose and production (demo CD/DVD etc).
Original issue: http://jira.exoplatform.org/browse/JCR-404