Andrew Kornev commented on ZOOKEEPER-66:

I concur with Flavio: application must implement a watcher. At the very least 
you'd want to know about the session events such as connect, disconnect, and 
especially session expiration and athentication failure. The latter two cannot 
be automatically recovered from and must be handled by the application in a 
certain way (a new ZooKeeper object must be instantiated).

> Add NullWatcher, a watcher that does nothing
> --------------------------------------------
>                 Key: ZOOKEEPER-66
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-66
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: java client
>            Reporter: Anthony Urso
>            Priority: Minor
>         Attachments: nullwatcher.diff
> I found that I was repeating this code all over the place. Here is a 
> NullWatcher class, a Watcher that does nothing at all.

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