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https://issues.apache.org/jira/browse/SOLR-15421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17348946#comment-17348946
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David Smiley commented on SOLR-15421:
-------------------------------------

{quote}...if we accidentally create an empty config directory...
{quote}
Sounds like the root cause to me.  Can that be prevented?

I don't like having _two_ exists methods; let's not do that.  

Also FYI the name of the "solrconfig.xml" file is actually configurable at the 
time a core is created – 
[CREATE|https://nightlies.apache.org/solr/draft-guides/solr-reference-guide-8.8/coreadmin-api.html#coreadmin-create]
 see "config" param but I suppose we could ignore that technicality given it's 
only possible in standalone mode (I think?) and it's something that a user 
could work-around if there was a requirement on solrconfig.xml existing.

> ConfigSetService.checkConfigExists accepts empty configs
> --------------------------------------------------------
>
>                 Key: SOLR-15421
>                 URL: https://issues.apache.org/jira/browse/SOLR-15421
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Andras Salamon
>            Priority: Major
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Both {{FileSystemConfigSetService}} and {{ZkConfigSetService}} only checks 
> the existence of the directory only, if we accidentally create an empty 
> config directory this method returns true, but when we try to use the configs 
> to create a collection we got an error message like this:
> {noformat}
> Can't find resource 'solrconfig.xml' in classpath or '/configs/config_name', 
> cwd=/path/to/lib/solr/server {noformat}
>  



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