[jira] [Commented] (SPARK-28750) Use `--release 8` for javac

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-28750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908587#comment-16908587 ] 

Sean Owen commented on SPARK-28750:
-----------------------------------

[~dongjoon] I've tried this for an hour, and can't get it to work. {{scala-maven-plugin}} seems to hard-code specifying {{-source}} and {{-target}}, and this can't be combine with {{-release}}. The failure is from Javac, which is called from SBT, and called from the plugin. Without that, I don't think we can safely cross-compile for Java 8 from Java 11. This is with the latest plugin version 4.1.1. 

There might be an answer, or maybe needs some update to the plugin. For the short-term I would take the safe route and compile with Java 8 as-is, not cross-compile.

> Use `--release 8` for javac
> ---------------------------
>
>                 Key: SPARK-28750
>                 URL: https://issues.apache.org/jira/browse/SPARK-28750
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Build
>    Affects Versions: 3.0.0
>            Reporter: Dongjoon Hyun
>            Priority: Major
>




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