gremlin-server | A Docker container with a gremlin server | Continuous Deployment library

The reason you may not see sequential IDs is that properties also have IDs and in the case of TinkerGraph, are taken from the same pool. You can see this using the Gremlin Console locally also.

The way to work with a traversal is by building it up iteratively first by concatenating the steps that you want to execute (like V(), has() and so on) and then to terminate the traversal with a terminal step like iterate() which will execute the traversal.

You however use two terminal steps in your example which doesn't work. First you execute HasNext() to verify that the vertex exists and then you try to modify its properties which you then want to execute via Iterate(). The traversal was however already evaluated and its Bytecode was sent to the server when you executed HasNext(). It is afterwards not possible any more to modulate the traversal object.

This becomes more clear when you try to do the same in the Gremlin Console:

It turns out there were two errors:

1. the address must end with /gremlin, so in my case 'ws://localhost:8182/gremlin'
2. when trying this, an exception appears which looks like a connection error at first :

Are you using TinkerGraph? Is yes, the IDs are stored as long internally.

Please try g.E(18L)

I assume that you are using TinkerGraph if you are using the default gremlin-server.yaml. That file configured one TinkerGraph at:

I believe that some of the fixes that allow the IORegistry to hook the GraphBinary serializer have not yet been released although I do see the work on the main JanusGraph branch. [1] I was having the same problem you reported but was able to get things working using the GraphSONMessageSerialializerV3d0 serializer.

[1] https://github.com/JanusGraph/janusgraph/commit/1cb4b6e849e3f9c2802722fe7f84c760cd471429

This setup code works for me:

This line

Gremlin does have a special class for ensuring a Java Long. You can just do long(10000) given the appropriate import like: from gremlin_python.statics import long

I imagine your code is working fine and that the properties are present. The issue is that graph elements returned from queries are "references" only - meaning, they only include id and label and no properties. You should convert your results to use generic containers like Map using a step like elementMap(). You can find more discussion on this in the documentation in various places, but perhaps start with this and if you are interested more in why this is the way it is and what challenges are involved in changing it, please see this.