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https://issues.apache.org/jira/browse/SPARK-15451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15308703#comment-15308703
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Sean Owen commented on SPARK-15451:
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Yeah this has come up a few times in Spark -- there's a duplicate that I won't
even bother to find and link here. Classic, weird cross compilation issue.
> Spark PR builder should fail if code doesn't compile against JDK 7
> ------------------------------------------------------------------
>
> Key: SPARK-15451
> URL: https://issues.apache.org/jira/browse/SPARK-15451
> Project: Spark
> Issue Type: Bug
> Components: Build
> Affects Versions: 2.0.0
> Reporter: Marcelo Vanzin
>
> We need to compile certain parts of the build using jdk8, so that we test
> things like lambdas. But when possible, we should either compile using jdk7,
> or provide jdk7's rt.jar to javac. Otherwise it's way too easy to slip in
> jdk8-specific library calls.
> I'll take a look at fixing the maven / sbt files, but I'm not sure how to
> update the PR builders since this will most probably require at least a new
> env variable (to say where jdk7 is).
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