I am currently trying to access the ArangoDB database using Bulbs and Rexster. I need to do this because I want to use Bulbs ( http://bulbflow.com ) to run some gremlin requests 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 the ArangoDB BluePrint driver and got: blueprints-arangodb-graph-1.0.4-SNAPSHOT-jar-with-dependencies.jar
- I downloaded the Rexster 2.4 binaries Gremlin2.4 and copied the drawings-arangodb-graph-1.0.4-SNAPSHOT-jar-with-dependencies.jar to the (respectively) lib and ext folder
Then I came across several problems:
1st, (not a problem with light bulbs) I was unable to make ArangoDB work correctly with the 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, when starting 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)
Having cited some examples using version 2.2 of both Gremlin and Rexster, I downloaded them and installed the arangodb project driver again
This time it worked in both Gremlin 2.2 and Rexster 2.2:
- gEcount () returns something (↔ is thus supported)
- Rexster server is running and I was able to access the Rexster api on port 8182
BUT, the second problem is the following Python code:
from bulbs.rexster import Graph
from bulbs.config import Config
config = Config('http://localhost:8182/graphs/arangodb')
g = Graph(config)
:
({'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 to fix this (I'm not a Java programmer, by the way)
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)
Arango rexster.xml( arangodb 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>
[...]
/:)