How to use ArangoDB with bulbs & rexster?

Question

I'm currently trying to access an ArangoDB database by using Bulbs and Rexster. I need to do that because I want to use Bulbs (http://bulbflow.com) to launch some gremlin queries from Python. (I really like AQL and arangosh but I already have a lot of working gremlin scripts)

Here is what I did before trying to use Rexster from Bulbs :

• I successfully compiled ArangoDB BluePrint driver and got : blueprints-arangodb-graph-1.0.4-SNAPSHOT-jar-with-dependencies.jar
• I downloaded Gremlin2.4 an Rexster 2.4 binaries and copied blueprints-arangodb-graph-1.0.4-SNAPSHOT-jar-with-dependencies.jar in (respectively) lib and ext folder

I then faced several issues :

1st, (not an Bulbs issue) I didn't succeed in making ArangoDB work correctly with current version of Gremlin (2.4.0) and/or Rexster (2.4.0)

In gremlin 2.4 :

gremlin> import com.tinkerpop.blueprints.impls.arangodb.*
[...]
gremlin> g = ArangoDBGraphFactory.createArangoDBGraph();
==>arangodbgraph[{"_id":"_graphs\/factory_graph","_rev":"20228207","_key":"factory_graph","vertices":"factory_vertices","edges":"factory_edges"}]
gremlin> g.E.count()
Not supported yet.
Display stack trace? [yN]

In bash, while launching Rexster 2.4 :

Exception in thread "main" java.lang.NoSuchFieldError: isRDFModel
    at com.tinkerpop.blueprints.impls.arangodb.ArangoDBGraph.<clinit>(ArangoDBGraph.java:44)
    at com.tinkerpop.blueprints.impls.arangodb.utils.ArangoDBConfiguration.configureGraphInstance(ArangoDBConfiguration.java:60)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.getGraphFromConfiguration(GraphConfigurationContainer.java:119)
    at com.tinkerpop.rexster.config.GraphConfigurationContainer.<init>(GraphConfigurationContainer.java:54)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.reconfigure(XmlRexsterApplication.java:99)
    at com.tinkerpop.rexster.server.XmlRexsterApplication.<init>(XmlRexsterApplication.java:47)
    at com.tinkerpop.rexster.Application.<init>(Application.java:96)
    at com.tinkerpop.rexster.Application.main(Application.java:188)

Seing some examples using version 2.2 of both Gremlin and Rexster, I downloaded them and installed again arangodb blueprint driver

This time, it worked in both Gremlin 2.2 and Rexster 2.2 :

• g.E.count() returned something (<-> thus is supported)
• Rexster server launched and I could access Rexster api on port 8182

BUT, the 2nd issue is that the following Python code :

from bulbs.rexster import Graph
from bulbs.config import Config
config = Config('http://localhost:8182/graphs/arangodb')
g = Graph(config)

returned :

({'status': '500', 'transfer-encoding': 'chunked', 'server': 'grizzly/2.2.18', 'connection': 'close', 'date': 'Wed, 08 Jan 2014 17:30:29 GMT', 'access-control-allow-origin': '*', 'content-type': 'application/json'}, '{"message":"","error":"javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: groovy.lang.MissingMethodException.rollback() is applicable for argument types: () values: []\\nPossible solutions: collect(), collect(groovy.lang.Closure), collect(java.util.Collection, groovy.lang.Closure)","api":{"description":"evaluate an ad-hoc Gremlin script for a graph.","parameters":{"rexster.returnKeys":[...]

I don't know how this could be fixed (I'm not a Java programmer, btw)

Here is my env :

• Ubuntu 11.10
• java version "1.7.0_45"
• Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
• Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

Here is my Arango config in rexster.xml (which let me access arangodb from Rexster REST API) :

[...]
<graph>
    <graph-name>arangodb</graph-name>
    <graph-type>com.tinkerpop.blueprints.impls.arangodb.utils.ArangoDBConfiguration</graph-type>
    <properties>
        <graph-name>arangodb-rexster-graph</graph-name>
        <vertex-name>arangodb-rexster-graph-vertices</vertex-name>
        <edge-name>arangodb-rexster-graph-edges</edge-name>
        <host>localhost</host>
        <port>8529</port>
    </properties>
</graph>
[...]

Thanks in advance for any ideas/help :)

Answer 1

I've not used the ArangoDB Blueprints implementation, but you definitely have some versioning issues contributing to the problem. According to the pom, it looks like the 1.0.4-SNAPSHOT works with TinkerPop 2.3.0. I would start by making sure you use Gremlin/Rexster 2.3.0 as a first step to solving this problem. As a second step, make sure that the Rexster is serving properly prior to trying Bulbs. In other words, executing a few scripts through Rexster's Gremlin Extension and validating the results would be a good start to ensuring Bulbs works nicely when you try to connect via Python.

Answer 2

Concerning the rexster 2.4 problem: You can find a 2.4-branch in https://github.com/triAGENS/blueprints-arangodb-graph, that should work with rexster/gremlin 2.4