MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. It is a fast, scalable and easy to use embedded Java database.
'org.mapdb:mapdb:0.9.9'
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>0.9.9</version>
</dependency>
<dependency org="org.mapdb" name="mapdb" rev="0.9.9"/>
"org.mapdb", "mapdb", "0.9.9"