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From "Edward Ribeiro (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2680) Correct DataNode.getChildren() inconsistent behaviour.
Date Wed, 08 Feb 2017 16:45:42 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858205#comment-15858205
] 

Edward Ribeiro commented on ZOOKEEPER-2680:
-------------------------------------------

The "Unsupported major.minor version 51.0" usually happens 'cause the code was compiled with
a higher version JDK and run on a lower version JRE. In this particular case, looks like {{org/apache/kerby/kerberos/kerb}}
was compiled on JDK7 and run on JRE6. Further info:

http://stackoverflow.com/questions/10382929/how-to-fix-java-lang-unsupportedclassversionerror-unsupported-major-minor-versi

http://stackoverflow.com/questions/20690143/java-unsupported-major-minor-version-51-0





> Correct DataNode.getChildren() inconsistent behaviour.
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-2680
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2680
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.4.9, 3.5.1
>            Reporter: Mohammad Arshad
>            Assignee: Mohammad Arshad
>             Fix For: 3.4.10, 3.5.3, 3.6.0
>
>         Attachments: ZOOKEEPER-2680-01.patch
>
>
> DataNode.getChildren() API returns null and empty set if there are no children in it
depending on when the API is called. DataNode.getChildren() API behavior should be changed
and it should always return empty set if the node does not have any child
> *DataNode.getChildren() API Current Behavior:*
> # returns null initially
> When DataNode is created and no children are added yet, DataNode.getChildren() returns
null
> # returns empty set after all the children are deleted:
> created a Node
> add a child
> delete the child
> DataNode.getChildren() returns empty set.
> After fix DataNode.getChildren() should return empty set in all the above cases.



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