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I am currently trying to project several different "properties" resulting from one vertex that I have located. Figured out 1-1, where it is missing, however multiples I run into a bit of an issue.
I was able to force a representation of individual vertices by grouping by the ID.
This works in Gremlify with a "null" key, but running similar on AWS Neptune I get this exception:

'{"requestId":"9dfb90b3-e479-43b1-a77b-826d71575e78","code":"InternalFailureException","detailedMessage":"Error during serialization: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?) (through reference chain: java.util.ArrayList[0]->java.util.LinkedHashMap[\\"grandchild\\"])"}',

I know I should be sourcing this 'tag' from somewhere - just not sure how. Is it possible to even remove it?

Gremlify Example

Joe Kennedy
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1 Answers1

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This is due to some changes in the semantics that were made in TinkerPop 3.5 to support null values, see here. Amazon Neptune currently supports the 3.4.11 version of TinkerPop which does not include these changes while Gremlify supports 3.5.0.

bechbd
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  • Understood a bit, but I am not sure where the current 'null' is coming from nor how I replace it out. – Joe Kennedy Sep 21 '21 at 23:29
  • It is just: out("parent_to").valueMap(true).fold() , isn't it? There must be a reason that a traverser from that point is much different than from the base traverser being terminated with "toList()". – Joe Kennedy Sep 22 '21 at 01:28
  • In your example you have no 'id' property on the 'grandchild' nodes but this is what you are grouping by, which is why you have the null – bechbd Sep 22 '21 at 18:45