sarutak opened a new pull request #31023:
URL: https://github.com/apache/spark/pull/31023
### What changes were proposed in this pull request?
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This PR fixes an issue that `sbt unidoc` fails with JDK11.
With the current master, sbt unidoc fails because the generated Java sources
cause syntax error.
As of JDK11, the default doclet seems to refuse such syntax error.
Usually, it's enough to specify `--ignore-source-errors` option when
`javadoc` runs but unfortunately, we will get an internal error.
```
[error] javadoc: error - An internal exception has occurred.
[error] (java.lang.NullPointerException)
[error] Please file a bug against the javadoc tool via the Java bug
reporting page
[error] (http://bugreport.java.com) after checking the Bug Database
(http://bugs.java.com)
[error] for duplicates. Include error messages and the following diagnostic
in your report. Thank you.
[error] java.lang.NullPointerException
[error] at
jdk.compiler/com.sun.tools.javac.code.Types.erasure(Types.java:2340)
[error] at
jdk.compiler/com.sun.tools.javac.code.Types$14.visitTypeVar(Types.java:2398)
[error] at
jdk.compiler/com.sun.tools.javac.code.Types$14.visitTypeVar(Types.java:2348)
[error] at
jdk.compiler/com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:1659)
[error] at
jdk.compiler/com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4857)
[error] at
jdk.compiler/com.sun.tools.javac.code.Types.erasure(Types.java:2343)
[error] at
jdk.compiler/com.sun.tools.javac.code.Types.erasure(Types.java:2329)
[error] at
jdk.compiler/com.sun.tools.javac.model.JavacTypes.erasure(JavacTypes.java:134)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils$5.visitTypeVariable(Utils.java:1069)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils$5.visitTypeVariable(Utils.java:1048)
[error] at
jdk.compiler/com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:1695)
[error] at
[email protected]/javax.lang.model.util.AbstractTypeVisitor6.visit(AbstractTypeVisitor6.java:104)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.asTypeElement(Utils.java:1086)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.LinkInfoImpl.setContext(LinkInfoImpl.java:410)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.LinkInfoImpl.<init>(LinkInfoImpl.java:285)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.LinkFactoryImpl.getTypeParameterLink(LinkFactoryImpl.java:184)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.LinkFactoryImpl.getTypeParameterLinks(LinkFactoryImpl.java:167)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.links.LinkFactory.getLink(LinkFactory.java:196)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.getLink(HtmlDocletWriter.java:679)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.addPreQualifiedClassLink(HtmlDocletWriter.java:814)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.addPreQualifiedStrongClassLink(HtmlDocletWriter.java:839)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.AbstractTreeWriter.addPartialInfo(AbstractTreeWriter.java:185)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.AbstractTreeWriter.addLevelInfo(AbstractTreeWriter.java:92)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.AbstractTreeWriter.addLevelInfo(AbstractTreeWriter.java:94)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.AbstractTreeWriter.addTree(AbstractTreeWriter.java:129)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.AbstractTreeWriter.addTree(AbstractTreeWriter.java:112)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.PackageTreeWriter.generatePackageTreeFile(PackageTreeWriter.java:115)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.PackageTreeWriter.generate(PackageTreeWriter.java:92)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDoclet.generatePackageFiles(HtmlDoclet.java:312)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:210)
[error] at
jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.run(AbstractDoclet.java:114)
[error] at
jdk.javadoc/jdk.javadoc.doclet.StandardDoclet.run(StandardDoclet.java:72)
[error] at
jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:588)
[error] at
jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:432)
[error] at
jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:345)
[error] at
jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:63)
[error] at jdk.javadoc/jdk.javadoc.internal.tool.Main.main(Main.java:52)
```
I found the internal error happens when a generated Java class is from a
Scala class which is package private and generic.
I also found that if we don't generate class hierarchy tree in the JavaDoc,
we can suppress the internal error.
### Why are the changes needed?
<!--
Please clarify why the changes are needed. For instance,
1. If you propose a new API, clarify the use case for a new API.
2. If you fix a bug, you can clarify why it is a bug.
-->
Make the build success with sbt and JDK11.
### Does this PR introduce _any_ user-facing change?
<!--
Note that it means *any* user-facing change including all aspects such as
the documentation fix.
If yes, please clarify the previous behavior and the change this PR proposes
- provide the console output, description and/or an example to show the
behavior difference if possible.
If possible, please also clarify if this is a user-facing change compared to
the released Spark versions or within the unreleased branches such as master.
If no, write 'No'.
-->
No.
### How was this patch tested?
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test cases that check the changes thoroughly including negative and positive
cases if possible.
If it was tested in a way different from regular unit tests, please clarify
how you tested step by step, ideally copy and paste-able, so that other
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it was difficult to add.
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I confirmed the following command successfully finish with JDK11.
```
$ build/sbt -Phive -Phive-thriftserver -Pyarn -Pkubernetes -Pmesos
-Pspark-ganglia-lgpl -Pkinesis-asl -Phadoop-cloud unidoc
```
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