Norbert Kalmár resolved ZOOKEEPER-3633.
    Resolution: Fixed

> AdminServer commands throw NPE when only secure client port is used
> -------------------------------------------------------------------
>                 Key: ZOOKEEPER-3633
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3633
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.5.5, 3.5.6
>            Reporter: Mate Szalay-Beko
>            Assignee: Mate Szalay-Beko
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.6.0
>         Attachments: npe.txt
>          Time Spent: 50m
>  Remaining Estimate: 0h
> *thanks for Mike Smotritsky for reporting this bug!*
> when only secureClientPort is defined in the config and there is no regular 
> clientPort, then both the {{stat}} and the {{conf}} commands result in 500 
> Server Error caused by NullPointerExceptions. The problem is that no 
> {{serverCnxFactory}} is defined in the {{ZooKeeperServer}} in this case, we 
> have only {{secureServerCnxnFactory}}.
> see the attached stacktraces about the exceptions (reproduced on the current 
> master branch)
> The stat and conf admin commands should actually provide info about both 
> secure and unsecure connections, and should handle the case when any of these 
> are missing.

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