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https://issues.apache.org/jira/browse/ZOOKEEPER-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780490#comment-16780490
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Norbert Kalmar commented on ZOOKEEPER-2966:
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I think this was fixed by the netty 4 update. Unfortunately not backported to
3.5
https://issues.apache.org/jira/browse/ZOOKEEPER-3152
[~anmolnar] ?
> Flaky NullPointerException while closing client connection
> ----------------------------------------------------------
>
> Key: ZOOKEEPER-2966
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2966
> Project: ZooKeeper
> Issue Type: Sub-task
> Components: java client
> Affects Versions: 3.5.3
> Reporter: Enrico Olivelli
> Priority: Critical
>
> It is not always reproducible, I get this in system tests of client
> applications.
> ZK client 3.5.3, stacktrace self-explains
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
> at org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
> at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
> at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
> at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319){code}
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