Re: NullPointerException in calls of ZkClient

[Greg Nitro <gr...@gmail.com>]

Hi Hema,

I was about to bump this convo but then found this resolved issue:

https://github.com/sgroschupf/zkclient/issues/25

It's looking promising, but we are still testing the upgrade. The
resolution time of the issue would suggest it was resolved in release #0.8.

Hope this helps

-greg

On Wed, Feb 3, 2016 at 10:48 AM, Hema Bhatia <He...@apollo.edu> wrote:

> I am repeatedly seeing NPEs for calls made to ZkClient. I am using
> zkClient-0.5  + zookeeper 3.4.5 + kafka 0.8.2.0
>
> There is a related jira for similar NPE issue, and looks like zkClient-0.5
> must have solved the issue.
> https://issues.apache.org/jira/browse/KAFKA-2169
> https://issues.apache.org/jira/browse/KAFKA-824
>
> Some of the stack traces of calls I made :
>
> java.lang.NullPointerException: null
>
>                 at
> org.I0Itec.zkclient.ZkConnection.exists(ZkConnection.java:107)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:631)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:628)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:883)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:628)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:637)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> kafka.admin.AdminUtils$.topicExists(AdminUtils.scala:163)
> ~[kafka_2.10-0.8.2.0.jar:na]
>
>                 at kafka.admin.AdminUtils.topicExists(AdminUtils.scala)
> ~[kafka_2.10-0.8.2.0.jar:na]
>
>
> java.lang.NullPointerException: null
>
>                 at
> org.I0Itec.zkclient.ZkConnection.getChildren(ZkConnection.java:112)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:608)
> ~[zkclient-0.5.jar:0.5]
>
>                 at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:605)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:883)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:605)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:601)
> ~[zkclient-0.5.jar:0.5]
>
>                 at
> kafka.utils.ZkUtils$.getChildrenParentMayNotExist(ZkUtils.scala:475)
> ~[kafka_2.10-0.8.2.0.jar:na]
>
>                 at kafka.utils.ZkUtils$.getAllTopics(ZkUtils.scala:700)
> ~[kafka_2.10-0.8.2.0.jar:na]
>
>                 at kafka.utils.ZkUtils.getAllTopics(ZkUtils.scala)
> ~[kafka_2.10-0.8.2.0.jar:na]
>
>
>
> Is there a solution for this?
>
>
> Thanks,
> Hema
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