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https://issues.apache.org/jira/browse/LUCENE-6722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660035#comment-14660035
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Erik Hatcher commented on LUCENE-6722:
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More fuel to the fire, JavaScript. Solr has update processing and DIH hooks
for JavaScripting, and it's not compatible between Java7 and Java8. I've
encountered and had to fork an update-script.js file because of this already,
see SOLR-7652. There's probably more examples of where JavaScript differences
cause compatibility headaches.
> 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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