OrientDB

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To use the Document Database interface you must include these jars in your classpath: orient - commons -*. jar orientdb - core -*. jar

DocumentDatabase - orient - Document Database usage through Java APIs - NoSQL document database light, portable and fast. Supports ACID Tx, Indexes, asynch queries, SQL layer, clustering, etc

http://code.google.com/p/orient/wiki/DocumentDatabase
Note: The object database has been refactored since the release 1.0. If you use the previous one look at: Old Implementation ODatabaseObjectTx . To use the Object Database interface you must include these jars in your classpath:

ObjectDatabase - orient - Object Database usage through Java APIs - NoSQL document database light, portable and fast. Supports ACID Tx, Indexes, asynch queries, SQL layer, clustering, etc

http://code.google.com/p/orient/wiki/ObjectDatabase