The author of Hypersonic SQL wrote a new database engine h2, which is implemented by Java and is open-source. Including Java library and native executable (GCJ ). JDBC and some ODBC APIs. there are two modes: Embedded mode and client/server mode. You can operate on disks or memory. There is a web Console that supports clusters.
Http://www.h2database.com
Now there are almost four open source databases in Java:
Hypersonic SQL
H2
Apache Derby
Sun OS Database Engine
Among the four mainstream engines, Hypersonic SQL should be the most mature and robust. H2 currently does not support GPL Lisence. Derby is the default database supported by Apache Genomino, and Sun OS DB is the default database supported by Netbeans. The old saying is: flexible selection based on specific project requirements.
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