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Re: Serializing a JanusGraph subgraph in Gremlin-Java

John Ripley <riple...@...>
 

I was able to get it to work by including both JanusGraph and TinkerPop IoRegistries on both server and client

Tinkerpop 3.2.6 on (Janus 0.2.0) gremlin server and client

gremlin-server.yaml

...
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistry,org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
...

remote-objects.yaml

hosts: [127.0.0.1]
port: 8182
serializer: {
    className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0,
    config: {
        ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistry,org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry]
    }   
}

If I include only TinkIoRegistry, it complains about not being able to handle certain JanusGraph classes.  If I just include JanusGraphIoRegistry, it complains about not being able to handle certain Tinkerpop classes.

Thanks for your help, Stephen




On Thursday, April 5, 2018 at 5:01:12 PM UTC-5, John Ripley wrote:
I am connecting to a remote JanusGraph 0.20 instance from Java.  My client is using Tinkerpop 3.2.6.  I can do all the standard stuff, return vertices, edges, etc.

When I try to build a 2 generation subgraph in starting from a known seed

   Object o = g.V().has("id", 1).repeat(__.bothE().subgraph("subGraph").outV()).times(2).cap("subGraph").next();


I get the following exception:


org.apache.tinkerpop.gremlin.driver.exception.ResponseException: Error during serialization: Class is not registered: org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph

Note: To register this class use: kryo.register(org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph.class);

at org.apache.tinkerpop.gremlin.driver.Handler$GremlinResponseHandler.channelRead0(Handler.java:246) ~[gremlin-driver-3.3.1.jar:3.3.1]

        ...


This same line works fine in the gremlin console.  

gremlin> sg = g.V().has('id', 1).repeat(bothE().subgraph('subGraph').bothV()).times(3).cap('subGraph').next()

==>tinkergraph[vertices:4 edges:4]

I am using the out of the box JanusGraph 0.20 gremlin-server.yaml and remote-objects.yaml
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