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https://issues.apache.org/jira/browse/TINKERPOP-2590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Xia updated TINKERPOP-2590:
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Priority: Major (was: Trivial)
> ClassCastException when specifying "single cardinality" for edge property
> -------------------------------------------------------------------------
>
> Key: TINKERPOP-2590
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2590
> Project: TinkerPop
> Issue Type: Bug
> Components: structure
> Affects Versions: 3.4.8
> Reporter: Christopher Smith
> Priority: Major
>
> As I understand it, multi-properties are not supported on edges in Tinkerpop,
> and this is an understandable limitation. However, my expectation as an API
> client is that if I redundantly specify {{Cardinality.single}} when setting a
> property on an edge, it would succeed silently. Instead
> {{AddPropertyStep.java:151,153}} (as of 3.4.8) unconditionally casts the
> traversal element to {{Vertex}} on seeing any {{Cardinality}} at all,
> producing a confusing {{ClassCastException}}.
> (1) In the case of {{single}}, which specifies the correct semantics, the
> call should succeed. (This is relevant when trying to reuse a method to
> update a single-valued timestamp on a generic {{Element}}.)
> (2) It would be a major improvement to debugging to, instead of performing
> inline casting, use a wrapper method producing an error message such as
> "property cardinality may only be specified for a Vertex".
> There are many cases throughout the code where (2) applies; would you be
> interested in contributions to retrofit enhanced error messages?
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