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https://issues.apache.org/jira/browse/TINKERPOP3-955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000523#comment-15000523
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Marko A. Rodriguez commented on TINKERPOP3-955:
-----------------------------------------------
I added [~rjbriody]'s traversal as a {{GroupCountTest}} case and everything
passes fine for {{SparkGraphComputer}} (which I thought would also bust). Thus,
I will hand it over to [~spmallette].
> HashMap$Node not serializable
> -----------------------------
>
> Key: TINKERPOP3-955
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-955
> Project: TinkerPop 3
> Issue Type: Bug
> Components: server
> Affects Versions: 3.1.0-incubating
> Reporter: Bob Briody
> Assignee: Marko A. Rodriguez
>
> The following code
> m = g.V().groupCount().by(bothE().count()).next()
> m
> causes the following error when executed via gremlin server
> java.util.concurrent.ExecutionException:
> org.apache.tinkerpop.gremlin.driver.ser.SerializationException:
> java.lang.IllegalArgumentException: Class is not registered:
> java.util.HashMap$Node
> Note: To register this class use: kryo.register(java.util.HashMap$Node.class);
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