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https://issues.apache.org/jira/browse/ZOOKEEPER-3873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mohammad Arshad updated ZOOKEEPER-3873:
---------------------------------------
    Comment: was deleted

(was: Any idea how to reproduce this issue?)

> ClientCnxnSocketNIO#enableWrite throws NullPointerException
> -----------------------------------------------------------
>
>                 Key: ZOOKEEPER-3873
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3873
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>            Reporter: maoling
>            Priority: Minor
>             Fix For: 3.7.0
>
>
> I also attach the client side logs here
> {code:java}
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss for 
> /bench-watch/12318org.apache.zookeeper.KeeperException$ConnectionLossException:
>  KeeperErrorCode = ConnectionLoss for /bench-watch/123182020-06-27 
> 13:42:31,898 [myid:127.0.0.1:2181] - WARN  
> [pool-1-thread-11-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1278] - 
> Session 0x1001a2fab59004c for sever localhost/127.0.0.1:2181, Closing socket 
> connection. Attempting reconnect except it is a 
> SessionExpiredException.java.lang.NullPointerException at 
> org.apache.zookeeper.ClientCnxnSocketNIO.enableWrite(ClientCnxnSocketNIO.java:377)
>  at 
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:353)
>  at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1268) at 
> org.apache.zookeeper.KeeperException.create(KeeperException.java:102) at 
> org.apache.zookeeper.KeeperException.create(KeeperException.java:54) at 
> org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1856)
> {code}
>  
> {code:java}
> 2020-06-27 13:51:04,334 [myid:] - ERROR [pool-1-thread-12:ClientCnxn@1590] - 
> Timeout error occurred for the packet 'clientPath:null serverPath:null 
> finished:false header:: 13886,3  replyHeader:: 0,0,0  request:: 
> '/bench-watch/12815,T  response::  '.2020-06-27 13:51:04,334 [myid:] - ERROR 
> [pool-1-thread-12:ClientCnxn@1590] - Timeout error occurred for the packet 
> 'clientPath:null serverPath:null finished:false header:: 13886,3  
> replyHeader:: 0,0,0  request:: '/bench-watch/12815,T  response::  
> '.2020-06-27 13:51:04,334 [myid:] - ERROR [pool-1-thread-29:ClientCnxn@1590] 
> - Timeout error occurred for the packet 'clientPath:null serverPath:null 
> finished:false header:: 13395,3  replyHeader:: 0,0,0  request:: 
> '/bench-watch/12331,T  response::  '.2020-06-27 13:51:04,335 
> [myid:127.0.0.1:2181] - WARN  
> [pool-1-thread-12-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1278] - 
> Session 0x1001a2fab59003d for sever localhost/127.0.0.1:2181, Closing socket 
> connection. Attempting reconnect except it is a 
> SessionExpiredException.java.nio.channels.CancelledKeyException at 
> sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) at 
> sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77) at 
> org.apache.zookeeper.ClientCnxnSocketNIO.enableWrite(ClientCnxnSocketNIO.java:377)
>  at 
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:353)
>  at 
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1268)2020-06-27
>  13:51:04,336 [myid:127.0.0.1:2181] - INFO  
> [pool-1-thread-39-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1159] - 
> Opening socket connection to server localhost/127.0.0.1:2181.2020-06-27 
> 13:51:04,336 [myid:127.0.0.1:2181] - INFO  
> [pool-1-thread-39-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1161] - 
> SASL config status: Will not attempt to authenticate using SASL (unknown 
> error)2020-06-27 13:51:04,337 [myid:127.0.0.1:2181] - INFO  
> [pool-1-thread-39-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@993] - 
> Socket connection established, initiating session, client: /127.0.0.1:62205, 
> server: localhost/127.0.0.1:21812020-06-27 13:51:04,339 [myid:127.0.0.1:2181] 
> - INFO  
> [pool-1-thread-39-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1426] - 
> Session establishment complete on server localhost/127.0.0.1:2181, session id 
> = 0x1001a2fab59005a, negotiated timeout = 40000
> {code}



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