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https://issues.apache.org/jira/browse/LUCENE-8738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814857#comment-16814857
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Uwe Schindler commented on LUCENE-8738:
---------------------------------------

Hi,
I looked a bit more on the Observer code. I think we should add type safe 
method to the abstract superclass and change the java documentation. Because 
currently without knowing what SolrCores internaly does, its impossible to do 
it right. I think I will add a method to register, deregister and to notify to 
the abstract TransientCoreCache impl. This is in line with the current 
Observerable superclass.

Alternatively we need to change the Javadocs of TransientSolrCoreCache (we need 
to adapt anyways).

I am looking for a more "type safe" way to do this.

[~erickerickson]: what do you think?

> Bump minimum Java version requirement to 11
> -------------------------------------------
>
>                 Key: LUCENE-8738
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8738
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: general/build
>            Reporter: Adrien Grand
>            Priority: Minor
>              Labels: Java11
>             Fix For: master (9.0)
>
>
> See vote thread for reference: https://markmail.org/message/q6ubdycqscpl43aq.



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