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https://issues.apache.org/jira/browse/LUCENE-10260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448788#comment-17448788
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Uwe Schindler commented on LUCENE-10260:
----------------------------------------

This is caused by Module system: class.getPackage().getImplementationVersion() 
returns null for modules, because the meta-inf directory is completely ignored.

We should for safety check if opening indexes of previous version works, 
because spi may also break.

I tend to recommend to remove modules from startup scripts in 9.0 and wait for 
full module support.

> Luke's about window no longer shows version number
> --------------------------------------------------
>
>                 Key: LUCENE-10260
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10260
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: luke
>    Affects Versions: 9.0
>            Reporter: Uwe Schindler
>            Priority: Major
>
> This seems to be caused by the module change. It looks like the modularized 
> (automodule) no longer can get the Implementation verison using class 
> LuceneVersion (in root package).
>  
> We should fix this in case of respin, otherwise it is cosmetical only.



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