sql4o was written by Travis Reeder and provides an SQL interface to the db4o object datastore.
'org.datanucleus:datanucleus-db4o-sql:3.0.0-m2'
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-db4o-sql</artifactId>
<version>3.0.0-m2</version>
</dependency>
<dependency org="org.datanucleus" name="datanucleus-db4o-sql" rev="3.0.0-m2"/>
"org.datanucleus", "datanucleus-db4o-sql", "3.0.0-m2"