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I have downloaded Gremlin Server with an intention of being able to use Gremlin to traverse a Neo4j DB.

Now, speaking of the latter, it has to be somehow added to the Gremlin Server installation, but I have difficulty finding any up-to-date guidance on how to do that. There are a few posts here on SO describing various kinds of problems people run into, but no definitive solution, much less one for the current versions of both Tinkerpop and Neo4j.

Would appreciate specific links, tips etc.

Thanks!

There is a "TIP" describing Gremlin Server configuration in the TinkerPop reference documentation found here. Basically, you -install Neo4j dependencies:

bin/gremlin-server.sh install org.apache.tinkerpop neo4j-gremlin 3.3.4

then you edit your Gremlin Server YAML configuration file to connect to your database. Gremlin Server contains a sample file to get you started and is found the /conf directory of the installation. Of critical note is this entry:

graphs: {

  graph: conf/neo4j-empty.properties}

It specifies the Neo4j configuration to use and the sample one that ships with Gremlin Server looks like this:

gremlin.graph=org.apache.tinkerpop.gremlin.neo4j.structure.Neo4jGraph

gremlin.neo4j.directory=/tmp/neo4j

gremlin.neo4j.conf.dbms.auto_index.nodes.enabled=true

gremlin.neo4j.conf.dbms.auto_index.relationships.enabled=true

As you can see, the configuration basically just passes through Neo4j specific configuration to Neo4j itself. Only the first two lines are TinkerPop options. In this case, it sets up Neo4j for embedded mode, meaning Neo4j runs within the Gremlin Server JVM. You can make Gremlin Server part of a Neo4j HA cluster with instructions found in the reference documentation here.

Note that you asked for "current" versions of both TinkerPop and Neo4j. While these instructions are current for TinkerPop, I'm afraid that the Neo4j version TinkerPop supports is well behind their latest release. It would be nice if someone had time to issue a pull request for that.