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https://issues.apache.org/jira/browse/ZOOKEEPER-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15499400#comment-15499400
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Michael Han commented on ZOOKEEPER-2532:
----------------------------------------

It is weird indeed. Tried trigger QA bot a couple of times through 
cancel/submit not working either.
Not sure if it works to trigger the job directly in Jenkins.

> zkCli throwing nullpointerException instead it should provide help when 
> invalid input is entered
> ------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2532
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2532
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.5.1, 3.5.2
>            Reporter: Rakesh Kumar Singh
>            Assignee: Rakesh Kumar Singh
>            Priority: Minor
>             Fix For: 3.5.3, 3.6.0
>
>         Attachments: ZOOKEEPER-2532.patch
>
>
> 1. a) Connect to zookeeper using zkCli
>  b) just input space and then hit enter
> 2. a) Connect to zookeeper using zkCli and hit enter it will come as 
> connected 
>  b) just input space and then hit enter
> Console log is as below:-
> [zk: localhost:2181(CONNECTING) 0] 2016-08-25 16:54:48,143 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxnSocketNetty$ZKClientPipelineFactory@363]
>  - SSL handler added for channel: null
> 2016-08-25 16:54:48,175 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@980] - Socket 
> connection established, initiating session, client: /0:0:0:0:0:0:0:1:44592, 
> server: localhost/0:0:0:0:0:0:0:1:2181
> 2016-08-25 16:54:48,178 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxnSocketNetty$1@146] - channel is 
> connected: [id: 0xd03f4226, /0:0:0:0:0:0:0:1:44592 => 
> localhost/0:0:0:0:0:0:0:1:2181]
> 2016-08-25 16:54:48,288 [myid:] - INFO  [New I/O worker 
> #1:ClientCnxn$SendThread@1400] - Session establishment complete on server 
> localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x101a00305cc0005, negotiated 
> timeout = 30000
> WATCHER::
> WatchedEvent state:SyncConnected type:None path:null
>    
> Exception in thread "main" java.lang.NullPointerException
>       at 
> org.apache.zookeeper.ZooKeeperMain$MyCommandOptions.getArgArray(ZooKeeperMain.java:171)
>       at 
> org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:613)
>       at org.apache.zookeeper.ZooKeeperMain.processCmd(ZooKeeperMain.java:577)
>       at 
> org.apache.zookeeper.ZooKeeperMain.executeLine(ZooKeeperMain.java:360)
>       at org.apache.zookeeper.ZooKeeperMain.run(ZooKeeperMain.java:320)
>       at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:280)
> ----------------------------------------
> After connection is established, input space and hit enter
> [zk: localhost:2181(CONNECTING) 0] 2016-08-25 16:56:22,445 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxnSocketNetty$ZKClientPipelineFactory@363]
>  - SSL handler added for channel: null
> 2016-08-25 16:56:22,481 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxn$SendThread@980] - Socket 
> connection established, initiating session, client: /0:0:0:0:0:0:0:1:44594, 
> server: localhost/0:0:0:0:0:0:0:1:2181
> 2016-08-25 16:56:22,484 [myid:] - INFO  
> [main-SendThread(localhost:2181):ClientCnxnSocketNetty$1@146] - channel is 
> connected: [id: 0xe6d3a461, /0:0:0:0:0:0:0:1:44594 => 
> localhost/0:0:0:0:0:0:0:1:2181]
> 2016-08-25 16:56:22,597 [myid:] - INFO  [New I/O worker 
> #1:ClientCnxn$SendThread@1400] - Session establishment complete on server 
> localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x101a00305cc0007, negotiated 
> timeout = 30000
> WATCHER::
> WatchedEvent state:SyncConnected type:None path:null
> [zk: localhost:2181(CONNECTED) 0]  
> Exception in thread "main" java.lang.NullPointerException
>       at 
> org.apache.zookeeper.ZooKeeperMain$MyCommandOptions.getArgArray(ZooKeeperMain.java:171)
>       at 
> org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:613)
>       at org.apache.zookeeper.ZooKeeperMain.processCmd(ZooKeeperMain.java:577)
>       at 
> org.apache.zookeeper.ZooKeeperMain.executeLine(ZooKeeperMain.java:360)
>       at org.apache.zookeeper.ZooKeeperMain.run(ZooKeeperMain.java:320)
>       at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:280)



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