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https://issues.apache.org/jira/browse/TINKERPOP-1923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397105#comment-16397105
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James Baker commented on TINKERPOP-1923:
----------------------------------------

So this might be a combination of a Java 9 and TinkerGraph problem. If I 
compile with Java 8, it seems more robust.

Looking in the logs, it seems to be printing the "Removing original vertices" 
message twice (it shouldn't, there is nothing in the code that should cause 
that to happen) - so that could be some strange Java 9 compiler bug. Presumably 
if the log message is being called twice, the drop command could be called 
twice too.

If the Gremlin query was called twice, would you expect to see the error above?

> Intermittent NegativeArraySizeException on drop
> -----------------------------------------------
>
>                 Key: TINKERPOP-1923
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1923
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: tinkergraph
>    Affects Versions: 3.3.1
>            Reporter: James Baker
>            Priority: Major
>
> I am intermittently getting the following exception when dropping vertices on 
> a TinkerGraph:
> {noformat}
> Exception in thread "main" java.lang.NegativeArraySizeException
> at java.util.AbstractCollection.toArray(AbstractCollection.java:136)
> at java.util.ArrayList.addAll(ArrayList.java:581)
> at java.util.HashMap$Values.forEach(HashMap.java:981)
> at 
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerHelper.getEdges(TinkerHelper.java:172)
> at 
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.edges(TinkerVertex.java:146)
> at 
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.remove(TinkerVertex.java:131)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.DropStep.filter(DropStep.java:67)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep.processNextStart(FilterStep.java:38)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:50)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep.processNextStart(FilterStep.java:37)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.Traversal.iterate(Traversal.java:203)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.iterate(GraphTraversal.java:2664)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal$Admin.iterate(GraphTraversal.java:177)
> at 
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.DefaultGraphTraversal.iterate(DefaultGraphTraversal.java:48)
> at mycode.merge.GraphMerger.mergeVertices(GraphMerger.java:172)
> at mycode.merge.GraphMerger.lambda$mergeGraphs$6(GraphMerger.java:78)
> at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> at 
> java.util.concurrent.ConcurrentHashMap$ValueSpliterator.forEachRemaining(ConcurrentHashMap.java:3566)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
> at 
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
> at mycode.merge.GraphMerger.mergeGraphs(GraphMerger.java:79)
> at mycode.cli.mapper.MergeGraphFiles.main(MergeGraphFiles.java:117)
> {noformat}
> My code is as follows (the last line is Line 172, which is where the 
> exception is thrown):
> {code:java}
> LOGGER.info("Removing original vertices");
> Object[] ids = mergeGroup.stream().map(Element::id).toArray();
> LOGGER.debug("IDs to remove {}", ids);
> if(ids != null && ids.length > 0)
>     graph.traversal().V(ids).drop().iterate();
> {code}



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