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https://issues.apache.org/jira/browse/SOLR-79?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12473018
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Hoss Man commented on SOLR-79:
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my view is:
  * in most cases, a system property not being defined is going to prevent the 
value from being usable (ie: a blank dataDIr)
  * if you want to use a systemp prop in a place where it's acceptible to not 
have the prop defined at all, then just use ${prop:} to denote that an empty 
string should be used as the default.

> [PATCH] Using system properties in Solr configuration
> -----------------------------------------------------
>
>                 Key: SOLR-79
>                 URL: https://issues.apache.org/jira/browse/SOLR-79
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Alexander Saar
>         Assigned To: Erik Hatcher
>            Priority: Minor
>         Attachments: solr-config-system-property.patch, 
> solr-config-system-property.patch, solr-config-system-property.patch, 
> solr-config-system-property.patch, solr-config-system-property.patch, 
> solr-config-system-property.patch
>
>
> Actually it is not possible to use system properties for configuring the Solr 
> engine. There should be a way of referencing system properties from 
> solrconfig.xml, like {$prop.name}.
> The attached patch will provide this feature.

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