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https://issues.apache.org/jira/browse/TINKERPOP-3293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephen Mallette closed TINKERPOP-3293.
---------------------------------------
    Fix Version/s: 4.0.0
                   3.7.8
                   3.8.3
         Assignee: Stephen Mallette
       Resolution: Fixed

Fixed with: https://github.com/apache/tinkerpop/commit/c7b6b4bbec

> NPE on rollback with a vertex index but no edge index
> -----------------------------------------------------
>
>                 Key: TINKERPOP-3293
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-3293
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: tinkergraph
>    Affects Versions: 3.7.7
>            Reporter: Stephen Mallette
>            Assignee: Stephen Mallette
>            Priority: Critical
>             Fix For: 4.0.0, 3.7.8, 3.8.3
>
>
> TinkerTransaction.doRollback checks vertexIndex before calling 
> edgeIndex.rollback(). The NPE skips the rest of the cleanup, so the thread's 
> transaction is never closed. Under Gremlin Server this leaves a worker thread 
> whose later requests never get a response.



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