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https://issues.apache.org/jira/browse/SPARK-8815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-8815.
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Resolution: Not A Problem
> illegal java package names in jar
> ---------------------------------
>
> Key: SPARK-8815
> URL: https://issues.apache.org/jira/browse/SPARK-8815
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Sam Halliday
> Priority: Minor
>
> In ENSIME we were unable to index the spark jars and we investigated
> further... you have classes that look like this:
> org.spark-project.guava.annotations.VisibleForTesting
> Hyphens are not legal package names according to the java language spec, so
> I'm amazed that this can actually be read at runtime... certainly no compiler
> I know would allow it.
> What I suspect is happening is that you're using a build plugin that
> internalises some of your dependencies and it is using your groupId but not
> validating it... and then blindly using that name in the ASM manipulation.
> You might want to report this upstream with your build plugin.
> For your next release, I recommend using an explicit name that is not your
> groupId. i.e. convert hyphens to underscores as Gosling recommends.
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