Oracle Berkeley DB Java Edition is an embedded database, so it runs within your application rather than as a standalone server. The data is stored in a directory on the file system.

Apache Lucene is an embedded index, so it runs within your application rather than as a standalone server. The data is stored in a directory on the file system.

jgex-berkeleyje.properties contains the directory locations for BerkeleyJE and Lucene.

Refer to the JanusGraph configuration reference for additional properties.

The required Maven dependency for BerkeleyJE:

        <dependency>
            <groupId>org.janusgraph</groupId>
            <artifactId>janusgraph-berkeleyje</artifactId>
            <version>${janusgraph.version}</version>
            <scope>runtime</scope>
        </dependency>

The required Maven dependency for Lucene:

        <dependency>
            <groupId>org.janusgraph</groupId>
            <artifactId>janusgraph-lucene</artifactId>
            <version>${janusgraph.version}</version>
            <scope>runtime</scope>
        </dependency>

This command can be run from the examples or the project's directory.

mvn exec:java -pl :example-berkeleyje

After running an example, you may want to drop the graph from storage. Make sure to stop the application before dropping the graph. This command can be run from the examples or the project's directory.

mvn exec:java -pl :example-berkeleyje -Dcmd=drop

The configuration uses the application name jgex as the root directory for the BerkeleyJE and Lucene directories. The directory is safe to remove after running the drop command.

rm -rf jgex/