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https://issues.apache.org/jira/browse/NIFI-10454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601794#comment-17601794
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Nurullah Çalışkan commented on NIFI-10454:
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[~mattyb149] We use the processor inside Nifi. These processors have always 
existed. After rebooting, this problem appears for sure. But I can give you a 
photo.
When the visual nifi below was opened, the processor never started, even though 
the script body was empty, it opened such a thread and that thread was not 
closed. It just closes when it terminates. Then it says invalid

!image (6).png!

> flowfiles not progressing
> -------------------------
>
>                 Key: NIFI-10454
>                 URL: https://issues.apache.org/jira/browse/NIFI-10454
>             Project: Apache NiFi
>          Issue Type: Bug
>            Reporter: Nurullah Çalışkan
>            Priority: Major
>         Attachments: image (6).png
>
>
> When the script body part of the execute script processor is set as set empty 
> string and added to the nifi UI from the registry, 1 thread is open. The more 
> processors there are, the more threads open. Because these threads are not 
> terminated, the processors cannot proceed to the next runtime. This prevents 
> flowfiles from progressing.
> I found a solution for this myself, so I'll share it. I found each processor 
> one by one and terminated it. Problem solved. Then my flowfiles started to 
> progress.
> This is the problem: I've seen nifi-1.15.x , nifi-1.16.0 and nifi-1.17.0, but 
> haven't tried the others. I am using openjdk java 11.



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