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https://issues.apache.org/jira/browse/HADOOP-17179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169775#comment-17169775
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Akira Ajisaka commented on HADOOP-17179:
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In HADOOP-17091, I set the source version to 8 to fix this error, however, the
fix is not correct.
> [JDK 11] Fix javadoc error while detecting Java API link
> --------------------------------------------------------
>
> Key: HADOOP-17179
> URL: https://issues.apache.org/jira/browse/HADOOP-17179
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: build
> Reporter: Akira Ajisaka
> Assignee: Akira Ajisaka
> Priority: Major
>
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc-no-fork
> (default-cli) on project hadoop-hdfs-rbf: An error has occurred in Javadoc
> report generation:
> [ERROR] Exit code: 1 - javadoc: warning - You have specified the HTML version
> as HTML 4.01 by using the -html4 option.
> [ERROR] The default is currently HTML5 and the support for HTML 4.01 will be
> removed
> [ERROR] in a future release. To suppress this warning, please ensure that any
> HTML constructs
> [ERROR] in your comments are valid in HTML5, and remove the -html4 option.
> [ERROR] javadoc: error - The code being documented uses modules but the
> packages defined in https://docs.oracle.com/javase/8/docs/api/ are in the
> unnamed module.
> {noformat}
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