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https://issues.apache.org/jira/browse/CONNECTORS-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767116#comment-16767116
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Markus Schuch commented on CONNECTORS-1581:
-------------------------------------------

Was not able to reproduce. Everything was cleaned up properly after deleting 
multiple jobs with >1.000.000 records, even when i poked around with database, 
database connection, the manifoldcf process and the outputrepo.

It is possible, that the error occured while using an older version of the 
mariadb jdbc driver (which we updated frequently in our setup), but since lack 
of time i won't invest to explore this further.

> [Set priority thread] Error tossed: null during startup
> -------------------------------------------------------
>
>                 Key: CONNECTORS-1581
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-1581
>             Project: ManifoldCF
>          Issue Type: Bug
>         Environment: •        ManifoldCF 2.12, running in a Docker Container 
> based on Redhat Linux, OpenJDK 8 
> •     AWS RDS Database (Aurora MySQL -> 5.6 compatible, utf8 (collation 
> utf8_bin))
> •     Single Process Setup
>            Reporter: Markus Schuch
>            Assignee: Markus Schuch
>            Priority: Major
>
> We see the following {{NullPointerException}} at startup:
> {code}
> [Set priority thread] FATAL org.apache.manifoldcf.crawlerthreads- Error 
> tossed: null
> java.lang.NullPointerException
> at 
> org.apache.manifoldcf.crawler.system.ManifoldCF.writeDocumentPriorities(ManifoldCF.java:1202)
> at 
> org.apache.manifoldcf.crawler.system.SetPriorityThread.run(SetPriorityThread.java:141)
> {code}
> What could be the cause of that?



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