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https://issues.apache.org/jira/browse/TINKERPOP-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853051#comment-16853051
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Alejandro Carbonara commented on TINKERPOP-1935:
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I ran into this error too.
The error message is rather undescriptive. Could it throw some kind of error
message that says that Tinkerpop does not support exporting graphs with
multi-properties to GraphML?
> GraphML Export Fails with List Cardinality
> ------------------------------------------
>
> Key: TINKERPOP-1935
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1935
> Project: TinkerPop
> Issue Type: Bug
> Components: io
> Affects Versions: 3.3.2
> Reporter: James Baker
> Priority: Major
>
> Exporting to GraphML throws an error if there are nodes with a List
> Cardinality and multiple values set for a property. This works fine when
> exporting to GraphSON.
> The exception thrown is:
> {{java.lang.IllegalStateException: Multiple properties exist for the provided
> key, use Vertex.properties(name)}}{{at
> org.apache.tinkerpop.gremlin.structure.Vertex$Exceptions.multiplePropertiesExistForProvidedKey(Vertex.java:179)}}
> {{ at
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.property(TinkerVertex.java:75)}}
> {{ at
> org.apache.tinkerpop.gremlin.structure.io.graphml.GraphMLWriter.writeVertices(GraphMLWriter.java:315)}}
> {{ at
> org.apache.tinkerpop.gremlin.structure.io.graphml.GraphMLWriter.writeGraph(GraphMLWriter.java:193)}}
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