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https://issues.apache.org/jira/browse/ZOOKEEPER-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060974#comment-15060974
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Steve Loughran commented on ZOOKEEPER-2345:
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That first warning is a sign that {{username}} == null in the sasl callback,
which is a more serious condition: a password callback has come in without a
name callback, or the name callback came in but
{{credentials.get(nc.getDefaultName()} == null} . Either way, it could be
reported better.
> ServerCnxnFactory.configureSaslLogin() loses stack trace on auth failures
> -------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2345
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2345
> Project: ZooKeeper
> Issue Type: Sub-task
> Components: server
> Affects Versions: 3.4.6
> Reporter: Steve Loughran
>
> When there's a problem authenticating in
> {{ServerCnxnFactory.configureSaslLogin() }}, the exception is retained -but
> the full stack lost.
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