A little bug in org.apache.zookeeper.ZooKeeper (3.4.6)

Thu, 20 Nov 2014 23:24:07 -0800 

Hi,
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.

Thanks!

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