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https://issues.apache.org/jira/browse/TINKERPOP-1468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611821#comment-15611821
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Robert Dale commented on TINKERPOP-1468:
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Then again, you do have the stacktrace pointing right to the optional() method.
I think the next logical step is to check the API. The API clearly shows that
it takes a Traversal parameter. I hope at that point it's obvious what needs to
be done. It may not be user friendly in the sense of hand-holding, but it's a
lot better than most SQL error messages. So, yes, I would close as "won't fix".
> GraphTraversal.optional throws a NPE if no traversal is provided
> ----------------------------------------------------------------
>
> Key: TINKERPOP-1468
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1468
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.2
> Reporter: Ted Wilmes
> Labels: trivial
>
> {{GraphTraversal.optional}} throws a NPE if no traversal is provided. We
> should probably throw a friendlier exception with instructions to provide a
> traversal as an argument.
> {code}
> gremlin> g.V().optional()
> java.lang.NullPointerException
> Type ':help' or ':h' for help.
> Display stack trace? [yN]y
> java.lang.NullPointerException
> at
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.optional(GraphTraversal.java:1316)
> {code}
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