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https://issues.apache.org/jira/browse/LUCENE-6722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660005#comment-14660005
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Shawn Heisey commented on LUCENE-6722:
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+1 to Uwe's idea.
My fuzzy recollections regarding the switch of trunk to Java 7 involve a
*major* concerted effort around critical improvements in the language -- in
particular, switching all file I/O to the new Files class. I recall something
about a big effort to switch to the diamond operator, and a smaller effort to
use try-with-resources as well. Those changes were extremely fundamental and
very likely caused backporting hell, so I was not particularly surprised that
we included those changes in branch_4x and jumped our Java requirement.
So far I have not seen any evidence that anyone is quite as keen to integrate
new Java 8 features on a large scale. If that changes, then trunk will deviate
significantly from branch_5x, and when that happens, then we will have an
extremely compelling reason to change the minimum Java version in 5x.
> 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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