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https://issues.apache.org/jira/browse/HADOOP-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078018#comment-16078018
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Steve Loughran commented on HADOOP-11875:
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I think we need to do this. It is time, and the time begins with a 3.0
I note there is actually one possible backwards compatibility strategy,
producing a special jar of old hamlet stuff which people could use until
they've moved. But that might just discourage people from migrating, which is
fine if they build and run on java 8, but if anything is distributed to run on
java 9, things will break downstream then.
> [JDK9] Renaming _ as a one-character identifier to another identifier
> ---------------------------------------------------------------------
>
> Key: HADOOP-11875
> URL: https://issues.apache.org/jira/browse/HADOOP-11875
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Tsuyoshi Ozawa
> Assignee: Akira Ajisaka
> Labels: webapp
> Attachments: build_error_dump.txt, HADOOP-11875.01.patch,
> HADOOP-11875.02.patch, HADOOP-11875.03.patch, HADOOP-11875.04.patch,
> HADOOP-11875.05.patch, HADOOP-11875.06.patch, HADOOP-11875.07.patch,
> HADOOP-11875.10.patch, HADOOP-11875.11.patch
>
>
> From JDK9, _ as a one-character identifier is banned. Currently Web UI uses
> it. We should fix them to compile with JDK9.
> https://bugs.openjdk.java.net/browse/JDK-8061549
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