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https://issues.apache.org/jira/browse/ZOOKEEPER-2086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14228797#comment-14228797
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Flavio Junqueira commented on ZOOKEEPER-2086:
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[~rchzzjcn], do you want to propose a patch?
> Unnecessary error log when defaultWatcher is not set for ZooKeeper client
> --------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2086
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2086
> Project: ZooKeeper
> Issue Type: Bug
> Components: java client
> Affects Versions: 3.4.6
> Reporter: Cheng
> Priority: Minor
>
> In org.apache.zookeeper.ZooKeeper.ZKWatchManager#materialize(), even if the
> defaultWatcher is null, it is still be added into the Set and returned. This
> would cause a lot of annoying error log at
> org.apache.zookeeper.ClientCnxn.EventThread#processEvent as below:
> 2014-11-21 15:21:23,279 - ERROR -
> [main-EventThread:ClientCnxn$EventThread@524] - Error while calling watcher
> java.lang.NullPointerException
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> It can be simply fixed by having a null check in ZKWatchManager.
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