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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CONNECTORS-1581) [Set priority thread] Error tossed: null during startup
Date Tue, 12 Feb 2019 13:51:00 GMT

    [ https://issues.apache.org/jira/browse/CONNECTORS-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766037#comment-16766037
] 

Karl Wright commented on CONNECTORS-1581:
-----------------------------------------

It's possible that the problem is due to funkiness in MySQL.  We've had a lot of trouble lately
because MySQL no longer seems to be properly enforcing transaction integrity in at least some
circumstances.  OR it could be the open-source MySQL driver we're using; maybe that needs
an upgrade?

At any rate, removal of jobqueue rows MUST precede removal of job table rows; there's a constraint
in place in fact.  So if you get to the point where that constraint has been violated, you're
pretty certain it's a database issue. :-(


> [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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