Hi Robin, Could you create a jira and report it there, please? If you could provide a patch, even better.
-Flavio -----Original Message----- From: "Robin" <[email protected]> Sent: 21/11/2014 07:23 To: "[email protected]" <[email protected]> Subject: A little bug in org.apache.zookeeper.ZooKeeper (3.4.6) 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!
