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Akira AJISAKA commented on HADOOP-11875:
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bq. Java8 merely warns about it.
FYI: Java9 forbids it. https://blogs.oracle.com/sundararajan/entry/underscore_is_a_keyword_in
> [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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