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https://issues.apache.org/jira/browse/SPARK-27273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16805396#comment-16805396
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Robert Kruszewski commented on SPARK-27273:
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This is when compiling a subclass of UserDefinedType in my code. I am compiling
against the master branch of spark with that change
> Compile break for UserDefinedType (DataType) subclasses with javac 8
> --------------------------------------------------------------------
>
> Key: SPARK-27273
> URL: https://issues.apache.org/jira/browse/SPARK-27273
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Robert Kruszewski
> Priority: Minor
>
> After [https://github.com/apache/spark/pull/23069] subclassing DataType
> (manifests by subclassing UserDefinedType) causes java compile to fail with
> (javac 11 succeeds):
> {code:java}
> error: cannot access 1
> class file for org.apache.spark.sql.types.DataType$1 not found
> Consult the following stack trace for details.
> com.sun.tools.javac.code.Symbol$CompletionFailure: class file for
> org.apache.spark.sql.types.DataType$1 not found{code}
> After debugging this I have noticed that JSortedObject that's part of
> DataType object gets compiled as DataType$JSortedObject subclass but the
> reference in DataType class is an anonymous inner class without a name
> (defaults to $1). Before the linked commit all inner classes have aliases and
> compilation succeeds. The issue occurs both with scala 2.11 and 2.12 builds.
> The issue doesn't occur when compiling with scala.
>
> An easy fix is to move JSortedObject out of DataType object but that's
> workaround not the root cause
>
> Apologies if this is not the right place for this issue.
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