public static Neo4jGraph open(final String directory) {
        final Configuration config = new BaseConfiguration();
        config.setProperty(CONFIG_DIRECTORY, directory);
        return open(config);
    }
Construct a Neo4jGraph instance by specifying the directory to create the database in..
neo4j-gremlin/src/main/java/org/apache/tinkerpop/gremlin/neo4j/structure/Neo4jGraph.java