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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Commented] (TINKERPOP-2192) Gremlin.Net.Driver.Connection.Parse throws a NullReferenceException
Date Thu, 05 Mar 2020 16:34:00 GMT

    [ https://issues.apache.org/jira/browse/TINKERPOP-2192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17052310#comment-17052310

ASF GitHub Bot commented on TINKERPOP-2192:

spmallette commented on pull request #1247: TINKERPOP-2192 Null checks added to Connection.Parse
URL: https://github.com/apache/tinkerpop/pull/1247
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> Gremlin.Net.Driver.Connection.Parse throws a NullReferenceException
> -------------------------------------------------------------------
>                 Key: TINKERPOP-2192
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2192
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: dotnet
>    Affects Versions: 3.4.1
>            Reporter: Florian Hockmann
>            Priority: Minor
> The Parse method has only three objects on which we call methods of which two are {{readonly}}.
So the problem is most likely in the error handling:
> {code}
> if (_callbackByRequestId.TryRemove(receivedMsg.RequestId, out var responseHandler))
>  {
>      responseHandler.HandleFailure(e);
> }
>  {code}
> Here, {{responseHandler}} can be null if the callback handler for that request id was
not found. So we just need a null check. (We can't notify anyone about a failure any way in
this case.)
> Stack trace:
> {code}
> System.NullReferenceException: Object reference not set to an instance of an object.
>    at Gremlin.Net.Driver.Connection.Parse(Byte[] received)
>    at Gremlin.Net.Driver.Connection.ReceiveMessagesAsync()
>    at Gremlin.Net.Driver.ProxyConnection.SubmitAsync[T](RequestMessage requestMessage)
>    at Gremlin.Net.Driver.GremlinClient.SubmitAsync[T](RequestMessage requestMessage)
>    at Gremlin.Net.Driver.Remote.DriverRemoteConnection.SubmitBytecodeAsync(Guid requestid,
Bytecode bytecode)
>    at Gremlin.Net.Driver.Remote.DriverRemoteConnection.SubmitAsync[S,E](Bytecode bytecode)
>    at Gremlin.Net.Process.Remote.RemoteStrategy.ApplyAsync[S,E](ITraversal`2 traversal)
>    at Gremlin.Net.Process.Traversal.DefaultTraversal`2.ApplyStrategiesAsync()
>    at Gremlin.Net.Process.Traversal.DefaultTraversal`2.Promise[TReturn](Func`2 callback)
>  {code}

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