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https://issues.apache.org/jira/browse/HADOOP-4660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647696#action_12647696
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Tom White commented on HADOOP-4660:
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>From version 0.19.0 we do require Java 6. See HADOOP-2325.
> JobTracker wont compile on Java5 as you cant use @Override with an interface
> implementation in Java5
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4660
> URL: https://issues.apache.org/jira/browse/HADOOP-4660
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Steve Loughran
>
> Unless there is a java6+ only policy, the bits of JobTracker that declare
> they @Override the JobSubmissionProtocol need to have those @Override
> attributes commented out, as Java5 wont let you override interface methods,
> only class methods (strange but true)
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