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https://issues.apache.org/jira/browse/HADOOP-15287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387079#comment-16387079
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Takanobu Asanuma commented on HADOOP-15287:
-------------------------------------------
Thanks for the review, [~ajisakaa]. I uploaded a new patch addressing your
comments.
> JDK9 JavaDoc build fails due to one-character underscore identifiers in
> hadoop-yarn-common
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-15287
> URL: https://issues.apache.org/jira/browse/HADOOP-15287
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: documentation
> Environment: Java 9.0.4, Applied HADOOP-12760 and HDFS-11610
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Attachments: HADOOP-15287.1.patch, HADOOP-15287.2.patch
>
>
> {{mvn --projects hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common
> javadoc:javadoc}} fails.
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-javadoc-plugin:3.0.0-M1:javadoc (default-cli)
> on project hadoop-yarn-common: An error has occurred in Javadoc report
> generation:
> [ERROR] Exit code: 1 -
> ./hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/hamlet/Hamlet.java:50:
> error: as of release 9, '_' is a keyword, and may not be used as an
> identifier
> [ERROR] public class HTML<T extends _> extends EImp<T> implements
> HamletSpec.HTML {
> [ERROR] ^
> [ERROR]
> ./hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/hamlet/Hamlet.java:92:
> error: as of release 9, '_' is a keyword, and may not be used as an
> identifier
> [ERROR] return base().$href(href)._();
> [ERROR] ^
> ...
> {noformat}
> FYI: https://bugs.openjdk.java.net/browse/JDK-8061549
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