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https://issues.apache.org/jira/browse/HADOOP-15902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17870099#comment-17870099
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Akira Ajisaka commented on HADOOP-15902:
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>From my knowledge, It's necessary to set -html4 because there're lots of
>javadoc errors when running with -html5. After we fix the errors, then we can
>stop adding html4 option.
> [JDK 11] Specify the HTML version of Javadoc to 4.01
> ----------------------------------------------------
>
> Key: HADOOP-15902
> URL: https://issues.apache.org/jira/browse/HADOOP-15902
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HADOOP-15902.1.patch, HADOOP-15902.2.patch
>
>
> From JDK9, Javadoc has options to specify the HTML version.
> {noformat}
> $ javadoc --help
> ...
> -html4 Generate HTML 4.01 output
> -html5 Generate HTML 5 output
> {noformat}
> JDK8 supports only HTML 4.01 output. The default html version of JDK9 and
> JDK10 is 4.01. That of JDK11 is 5. Let's unify the version to 4.01 for now.
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