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https://issues.apache.org/jira/browse/HADOOP-16928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17870542#comment-17870542
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ASF GitHub Bot commented on HADOOP-16928:
-----------------------------------------
pan3793 opened a new pull request, #6976:
URL: https://github.com/apache/hadoop/pull/6976
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### Description of PR
HADOOP-15902 added `-html4` options for javadoc on Java 11 and above, while
`javadoc -html4` option has been removed since Java 13
(https://bugs.openjdk.java.net/browse/JDK-8215578), and removed in recent Java
versions.
To make the javadoc work on Java 17, I must remove the `-html4` and fix all
errors for `-html5`(this is default is the only option for Java 17 `javadoc`)
### How was this patch tested?
macOS Java 17, aarch64
```
$ java -version
openjdk version "17.0.8" 2023-07-18 LTS
OpenJDK Runtime Environment Zulu17.44+15-CA (build 17.0.8+7-LTS)
OpenJDK 64-Bit Server VM Zulu17.44+15-CA (build 17.0.8+7-LTS, mixed mode,
sharing)
```
this works
```
$ mvn package -Pdocs -DskipTests
```
this also works
```
$ mvn clean install -DskipTests
$ mvn javadoc:javadoc
```
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> [JDK13] Support HTML5 Javadoc
> -----------------------------
>
> Key: HADOOP-16928
> URL: https://issues.apache.org/jira/browse/HADOOP-16928
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Reporter: Akira Ajisaka
> Priority: Major
>
> javadoc -html4 option has been removed since Java 13.
> https://bugs.openjdk.java.net/browse/JDK-8215578
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