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https://issues.apache.org/jira/browse/NIFI-3671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16014003#comment-16014003
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Mark Payne commented on NIFI-3671:
----------------------------------

[~jskora] - was this NiFi instance that you're talking about a cluster or a 
standalone NiFi instance?

> GenerateFlowFile throws NPE in FileSystemRepository
> ---------------------------------------------------
>
>                 Key: NIFI-3671
>                 URL: https://issues.apache.org/jira/browse/NIFI-3671
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.2.0
>         Environment: Ubuntu Linux 14.04.5 LTS, x86, NiFi 1.2.0-SNAPSHOT, Java 
> 1.8.0_102
>            Reporter: Joe Skora
>         Attachments: flow.xml, genff-npe.log, priority.groovy
>
>
> While volume testing, {{GenerateFlowFile}} is randomly throwing 
> {{NullPointerException}} during startup.  The NPE occurs in 
> {{FileSystemRepository.write()}} called from 
> {{BufferedOutputStream.flushBuffer()}} and results in an Administrative Yield.
> When it happens, the bulletin shows up on the processors immediately after 
> starting them.  Starting them a second time will often succeed, but sometimes 
> it takes a multiple retries.  When the {{GenerateFlowFile}} processors are 
> started for these tests, the graph is typically empty.
> Log entries for an example Thread are attached.  This looks similar to 
> [NIFI-2551|https://issues.apache.org/jira/browse/NIFI-2551], but that is 
> marked as being fixed in 1.0.0.



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