By pelegri on Nov 23, 2008
H2 (Website, Wikipedia, Download) is a small OpenSource, Java-based, RDBMS database that can be used embedded, server and clustered. It is written by Thomas Mueller, the original Hypersonic SQL developer (history).
Back in August, Marcio wrote a Nice Report showing how to use H2 with GlassFish using TopLink Essentials. This is now part of the formal documentation in the H2 Tutorial. GF support was incorporated in 1.1.101 (Oct 15th), but I just noticed as Marcio and Thomas are improving some parts.