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https://issues.apache.org/jira/browse/SOLR-5323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792850#comment-13792850
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Mark Miller commented on SOLR-5323:
-----------------------------------

I just think anything with the relative paths is a separate issue.

You can use any hierarchy - you just have to change those paths. I'm all for 
that being improved somehow, but the issue here seems to be:

Solr contrib modules are lazy loaded so that if you don't use them, you can 
delete any of them from the dist package layout and things still work. Or you 
can not delete them and if you try and use them, things work. Clustering now 
violates that. It's not really clusterings fault, it seems to more be a 
limitation of the search component.


> Solr requires -Dsolr.clustering.enabled=false when pointing at example config
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-5323
>                 URL: https://issues.apache.org/jira/browse/SOLR-5323
>             Project: Solr
>          Issue Type: Bug
>          Components: contrib - Clustering
>    Affects Versions: 4.5
>         Environment: vanilla mac
>            Reporter: John Berryman
>            Assignee: Dawid Weiss
>             Fix For: 4.6, 5.0
>
>
> my typical use of Solr is something like this: 
> {code}
> cd SOLR_HOME/example
> cp -r solr /myProjectDir/solr_home
> java -jar -Dsolr.solr.home=/myProjectDir/solr_home  start.jar
> {code}
> But in solr 4.5.0 this fails to start successfully. I get an error:
> {code}
> org.apache.solr.common.SolrException: Error loading class 
> 'solr.clustering.ClusteringComponent'
> {code}
> The reason is because solr.clustering.enabled defaults to true now. I don't 
> know why this might be the case.
> you can get around it with 
> {code}
> java -jar -Dsolr.solr.home=/myProjectDir/solr_home 
> -Dsolr.clustering.enabled=false start.jar
> {code}
> SOLR-4708 is when this became an issue.



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