Multiple cardinality failed with EventStrategy

[Pavel Ershov]

Sample of code

import org.apache.tinkerpop.gremlin.process.traversal.step.util.event.*
graph = TinkerFactory.createTheCrew()
graph.traversal().V().has('name', 'marko').property(VertexProperty.Cardinality.list, 'location','moscow')
strategy = EventStrategy.build().addListener(new ConsoleMutationListener(graph)).create()
g = graph.traversal().withStrategies(strategy)
g.V().has('name', 'marko').property(VertexProperty.Cardinality.list, 'location','saint-petersburg')

gremlin> graph = TinkerFactory.createTheCrew()
==>tinkergraph[vertices:6 edges:14]
gremlin> graph.traversal().V().has('name', 'marko').property(VertexProperty.Cardinality.list, 'location','moscow')
==>v[1]
gremlin> strategy = EventStrategy.build().addListener(new ConsoleMutationListener(graph)).create()
==>EventStrategy
gremlin> g = graph.traversal().withStrategies(strategy)
==>graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]
gremlin> g.V().has('name', 'marko').property(VertexProperty.Cardinality.list, 'location','saint-petersburg')
Multiple properties exist for the provided key, use Vertex.properties(location)
Type ':help' or ':h' for help.
Display stack trace? [yN]y
java.lang.IllegalStateException: Multiple properties exist for the provided key, use Vertex.properties(location)
    at org.apache.tinkerpop.gremlin.structure.Vertex$Exceptions.multiplePropertiesExistForProvidedKey(Vertex.java:179)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.property(TinkerVertex.java:75)
    at org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.property(TinkerVertex.java:43)
    at org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.AddPropertyStep.sideEffect(AddPropertyStep.java:97)
    at org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.SideEffectStep.processNextStart(SideEffectStep.java:39)
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
    at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:192)
    at org.apache.tinkerpop.gremlin.console.Console$_closure3.doCall(Console.groovy:214)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)

[Daniel Kuppitz]

At first, I thought it's just something not supported by ConsoleMutationListener, but it's, in fact, a bug deep in the core.

I created a Jira ticket: https://issues.apache.org/jira/browse/TINKERPOP-2159

Cheers,

Daniel

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