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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1875) NullPointerException in ClientCnxn$EventThread.processEvent
Date Sat, 15 Apr 2017 14:25:42 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969977#comment-15969977
] 

Christopher Tubbs commented on ZOOKEEPER-1875:
----------------------------------------------

I can confirm this bug affects 3.4.10 also. Will there be a 3.4.11 to fix this, or will this
only be fixed in 3.5+?
This issue affects the [zookeeper-maven-plugin|https://github.com/revelc/zookeeper-maven-plugin].
I've had to create a NOOPWatcher to work around, because null cannot be passed as a watcher
in the constructor.

> NullPointerException in ClientCnxn$EventThread.processEvent
> -----------------------------------------------------------
>
>                 Key: ZOOKEEPER-1875
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1875
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.4.5, 3.4.10
>            Reporter: Jerry He
>            Assignee: Jerry He
>            Priority: Minor
>             Fix For: 3.5.4, 3.6.0
>
>         Attachments: ZOOKEEPER-1875.patch, ZOOKEEPER-1875.patch, ZOOKEEPER-1875-trunk.patch
>
>
> We've been seeing NullPointerException while working on HBase:
> {code}
> 14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Client environment:user.dir=/home/biadmin/hbase-trunk
> 14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=hdtest009:2181
sessionTimeout=90000 watcher=null
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Opening socket connection to server hdtest009/9.30.194.18:2181.
Will not attempt to authenticate using SASL (Unable to locate a login configuration)
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Socket connection established to hdtest009/9.30.194.18:2181,
initiating session
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Session establishment complete on server
hdtest009/9.30.194.18:2181, sessionid = 0x143986213e67e48, negotiated timeout = 60000
> 14/01/30 22:15:25 ERROR zookeeper.ClientCnxn: Error while calling watcher
> java.lang.NullPointerException
>         at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
>         at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
> {code}
> The reason is the watcher is null in this part of the code:
> {code}
>        private void processEvent(Object event) {
>           try {
>               if (event instanceof WatcherSetEventPair) {
>                   // each watcher will process the event
>                   WatcherSetEventPair pair = (WatcherSetEventPair) event;
>                   for (Watcher watcher : pair.watchers) {
>                       try {
>                           watcher.process(pair.event);
>                       } catch (Throwable t) {
>                           LOG.error("Error while calling watcher ", t);
>                       }
>                   }
> {code}



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