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https://issues.apache.org/jira/browse/HADOOP-19402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016144#comment-18016144
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H. Vetinari commented on HADOOP-19402:
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{quote}However, JDiff does not support JDK 9 and above, and there are no plans
for further updates.
{quote}
To me that sounds like an unhealthy approach. If upstream jdiff stopped
maintenance, the right approach is to drop reliance on jdiff (even if your docs
are less nice as a consequence), rather than taking over maintenance of a
completely unrelated tool. Hadoop is struggling with staying up-to-date already
(years behind LTS Java support), so it's really not a good idea IMO to add yet
more things that cannibalise maintainer attention.
> [JDK11] JDiff Support JDK11
> ---------------------------
>
> Key: HADOOP-19402
> URL: https://issues.apache.org/jira/browse/HADOOP-19402
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
>
> JDiff is a tool used to generate Java API documentation and display
> differences between Java classes, primarily for detecting changes in Java API
> across versions. However, JDiff does not support JDK 9 and above, and there
> are no plans for further updates.
> Maven version: JDiff 1.0.9
> https://mvnrepository.com/artifact/jdiff/jdiff/1.0.9
> Official website: JDiff
> https://jdiff.sourceforge.net/
> During JDK 11 support, the changes in HADOOP-15304 allowed the project to
> compile successfully but skipped JDiff. However, generating the JDiff XML is
> still an essential step in the release process.
> To release Hadoop for JDK 11 and above, we need a tool similar to JDiff to
> handle API comparison and detect version changes.
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