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https://issues.apache.org/jira/browse/SOLR-13400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820798#comment-16820798
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Uwe Schindler commented on SOLR-13400:
--------------------------------------
In short: Master has this:
https://issues.apache.org/jira/secure/attachment/12965553/LUCENE-8738-solr-CoreCloseListener.patch
> Replace Observable pattern in TransientSolrCoreCache
> ----------------------------------------------------
>
> Key: SOLR-13400
> URL: https://issues.apache.org/jira/browse/SOLR-13400
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server, SolrCloud
> Affects Versions: 8.0, master (9.0)
> Reporter: Uwe Schindler
> Assignee: Erick Erickson
> Priority: Major
> Fix For: 8.1, master (9.0)
>
> Attachments: SOLR-13400.patch
>
>
> Due to change to Java 11 as minimum version (LUCENE-8738), the usage of the
> old java.utilObservable pattern is deprecated and cannot be used anymore in
> Lucene/Solr.
> LUCENE-8738 added a rewritten, more type-safe oimplementation of the observer
> pattern, but it looks like the is overengenieered. As there is only one
> listener registered, it would be enough to just call the method on SolrCores
> class (pkg-protected). On LUCENE-8738, [~erickerickson] suggested to move the
> callback method to queue closes of core in CoreContainer instead, so all the
> abstractions can be removed.
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