Não sei se já conhecem... mas é uma nova DB em java, parece ser ótima, ando a fazer alguns testes e me parece ser muito boa, vale a pena dar uma olhada.
http://www.h2database.com/
Welcome to H2, the free SQL database. The main feature of H2 are:
* Very fast, free for everybody, source code is included
* Written Java; can be compiled with GCJ (Linux)
* Embedded, Server and Cluster modes
* JDBC and (partial) ODBC API; Web Client application
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