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