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https://issues.apache.org/jira/browse/LUCENE-6722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14658988#comment-14658988
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Shawn Heisey commented on LUCENE-6722:
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bq. The hardships we face while merging changes from trunk to branch_5x is a
PITA.
I have occasionally run into things that had to be manually backported, but for
the most part, when I merge a commit from trunk to the stable branch, it works
without incident. I am not personally seeing a problem that's large enough to
warrant the Java upgrade.
Even if both branches use the same Java version, there will still be
discrepancies that will complicate backporting. That's just how things are
when there's a trunk/master in addition to a stable branch.
I'm really curious how often people run into merge conflicts, and what
percentage of those problems are due to differences related to the Java version
as opposed to other code changes.
> Java 8 as the minimum supported JVM version for branch_5x
> ---------------------------------------------------------
>
> Key: LUCENE-6722
> URL: https://issues.apache.org/jira/browse/LUCENE-6722
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Shalin Shekhar Mangar
> Priority: Blocker
> Fix For: 5.4
>
>
> Require Java 8 as the minimum supported JVM version for branch_5x.
> # Java 7 is already EOL'ed
> # Trunk is already at Java8
> # Important Solr components such as Jetty 9.3.x already require Java 8
> # Nashorn Javascript engine available in Java 8 is just so much faster and we
> may see more usage of JS inside Solr (SOLR-7576 etc.)
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