Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17358
Yea, It generates java codes for Java API. I suggested to fix these
together because they look similar instances and I didn't want to open another
minor PR for this (BTW,
[FlatMapGroupsWithStateFunction.java](https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.java)
seems not a generated code).
If you think this should be separately handled in another PR, then I am
happy to do so.
If you meant it is not an issue,
I tried both
```
rm -fr target
./build/sbt clean
./build/sbt unidoc
```
and
`cd docs && jekyll build`
I see
```
[error] (spark/javaunidoc:doc) javadoc returned nonzero exit code
```
and
```
jekyll 3.3.1 | Error: Unidoc generation failed
```
due to those four errors and I don't see `_site` and the Java API
documentation after `jekyll build` as written in
[docs#generating-the-documentation-html](https://github.com/apache/spark/tree/master/docs#generating-the-documentation-html).
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