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https://issues.apache.org/jira/browse/ZOOKEEPER-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056204#comment-14056204
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Flavio Junqueira commented on ZOOKEEPER-1961:
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from the stack trace, I'm wondering if this is a zk bug or a curator bug.
runFromConfig needs to be called to instantiate the cnxn factory. it would be
ok though to make the shutdown method idempotent.
> NPE in ZooKeeperServerMain.shutdown()
> -------------------------------------
>
> Key: ZOOKEEPER-1961
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1961
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.4.6
> Reporter: Steve Loughran
>
> while trying to stop a server that appears not to have started properly, the
> {{shutdown()}} method triggered an NPE
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