Cheng created ZOOKEEPER-2086:
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Summary: 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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