Sqlg is a tinkerpop 3 implementation on top of a rdbms.
'org.umlg:sqlg:1.1.0.RC2'
<dependency>
<groupId>org.umlg</groupId>
<artifactId>sqlg</artifactId>
<version>1.1.0.RC2</version>
</dependency>
<dependency org="org.umlg" name="sqlg" rev="1.1.0.RC2"/>
"org.umlg", "sqlg", "1.1.0.RC2"