Pavel created TINKERPOP-2281:
--------------------------------

             Summary: EventStrategy does not support properties with multiple 
cardinlity 
                 Key: TINKERPOP-2281
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2281
             Project: TinkerPop
          Issue Type: Bug
          Components: process
    Affects Versions: 3.4.2
            Reporter: Pavel


AddPropertyStep failed when properties has multiple values

{code}
java.lang.IllegalStateException: Multiple properties exist for the provided 
key, use Vertex.properties(_list_id)
        at 
org.apache.tinkerpop.gremlin.structure.Vertex$Exceptions.multiplePropertiesExistForProvidedKey(Vertex.java:179)
 ~[gremlin-core-3.4.2.jar:3.4.2]
        at 
org.apache.tinkerpop.gremlin.structure.Vertex.property(Vertex.java:74) 
~[gremlin-core-3.4.2.jar:3.4.2]
        at 
org.apache.tinkerpop.gremlin.structure.Vertex.property(Vertex.java:38) 
~[gremlin-core-3.4.2.jar:3.4.2]
        at 
org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.AddPropertyStep.sideEffect(AddPropertyStep.java:95)
 ~[gremlin-core-3.4.2.jar:3.4.2]
{code}

See line 
https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java#L95



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