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https://issues.apache.org/jira/browse/HADOOP-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128143#comment-15128143
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Steve Loughran commented on HADOOP-11875:
-----------------------------------------
I shouldn't have mentioned JSP. Nothing uses it.
# everything builds and runs on Java 8, you can just get a warning about using
{{_}} as a variable/method name
# that will become illegal on Java 9
# but given what else breaks on java 9, I doubt that's the main part of the
trouble.
FWIW, I do like the new HDFS UI. And I do think we could improve the YARN UI
too. It's just that hamlet is picked up downstream and used. To move people off
it would mean providing a nice, easy to use alternative. Which doesn't have to
be implemented in hadoop core -if there is one just as simple which we could
point people at, that would work
> [JDK8] 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: Bug
> Reporter: Tsuyoshi Ozawa
> Labels: newbie
> Attachments: build_error_dump.txt
>
>
> From JDK8, _ as a one-character identifier is disallowed. Currently Web UI
> uses it. We should fix them to compile with JDK8.
> https://bugs.openjdk.java.net/browse/JDK-8061549
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