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https://issues.apache.org/jira/browse/SOLR-15610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408353#comment-17408353
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Dawid Weiss commented on SOLR-15610:
------------------------------------

I did take a quick look. Part of the problem is definitely that libExt is not 
part of the project's Java's classpath. This was done on purpose - libExt 
collects JARs that shouldn't be visible on classpath by default but are part of 
the server. I think this could be cleaned up and be moved to runtimeOnly 
configuration... but I'm not sure what consequences this will have since this 
is really a bit convoluted part of the build (trying to simulate what ant did).

> Support json formatted logging via conf: add log4j-layout-template-json to 
> 'server'
> -----------------------------------------------------------------------------------
>
>                 Key: SOLR-15610
>                 URL: https://issues.apache.org/jira/browse/SOLR-15610
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Chris M. Hostetter
>            Assignee: Chris M. Hostetter
>            Priority: Major
>         Attachments: SOLR-15610.patch
>
>
> JSON Formatted logging is becoming wide spread enough that it seems like we 
> should support it as an option in Solr.
> Assuming we upgrade to log4j >= 2.14.0  (SOLR-15609) then this becomes 
> _possible_ for people to do by:
>  # downloading the {{log4j-layout-template-json.jar}} that corresponds with 
> the lof4j version used by their solr version
>  # include the {{log4j-layout-template-json.jar}} in the (jetty) classpath 
> via {{SOLR_OPTS}} (can't be loaded as a solr plugin because it needs to be 
> used on startup)
>  # specify their own {{LOG4J_PROPS}} file that configures log4j to use a 
> {{JsonTemplateLayout}}
> ..but steps #1 and #2 are a bit hairy.  Particularly step #1 as it means 
> every time users upgrade solr they have to pay careful attention to if/when 
> the log4j deps change.
> ----
> I would like to propose that we make this easier, by adding 
> {{log4j-layout-template-json}} as a dependency for the "server" module, so 
> that it is available out of the box when running solr – that way JSON logging 
> can be enabled easily with a simple {{LOG4J_PROPS}} change.



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