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https://issues.apache.org/jira/browse/SOLR-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995103#comment-12995103
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Hoss Man commented on SOLR-2364:
--------------------------------

This seems to have been caused by the following commits on Feb 11...

http://svn.apache.org/viewvc?view=revision&revision=1069656
http://svn.apache.org/viewvc?view=revision&revision=1069657

...which koji attributed to SOLR-1449, even though that issue (which added the 
{{<lib/>}} feature was resolved back in 2009 and was included in Solr 1.4.1.

I really don't know why Koji did that ... as far as i'm concerned this is a 
break in compatibility: the whole point of how these directives were setup was 
to support the possibility of directories not existing. (and the examples 
documented them as working that way)

Unless i here a strong reason to the contrary, i plan to revert those commits.

> <lib dir="..."/> directives are logging serious errors when they should not be
> ------------------------------------------------------------------------------
>
>                 Key: SOLR-2364
>                 URL: https://issues.apache.org/jira/browse/SOLR-2364
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 3.1, 4.0
>
>
> The {{<lib dir="foo" ... />}} syntax for solrconfig.xml was specificly 
> designed so that it would *not* log errors if the directory (or jars in that 
> directory) didn't exist -- this was designed to make it possible to have a 
> {{<lib/>}} directive that would optionally include jars if they are not 
> there, and ignore them if they can't be found ({{<lib 
> path="foo/bar.jar".../>}} can be used when you have an explict jar you want 
> to load and you want an error if it's not there)
> At some point in the not too distant past, something seems to have changed on 
> both the 3x and trunk branches in how SolrResourceLoader.replaceClassLoader 
> works, such that in the example you get errors logged like this...
> {noformat}
> Feb 15, 2011 4:52:03 PM org.apache.solr.core.SolrResourceLoader 
> addToClassLoader
> SEVERE: Can't find (or read) file to add to classloader: 
> /total/crap/dir/ignored
> {noformat}
> This is in spite of hte fact that the solrconfig.xml says...
> {noformat}
>   <!-- If a dir option (with or without a regex) is used and nothing is found
>        that matches, it will be ignored
>     -->
>   <lib dir="../../contrib/clustering/lib/downloads/" />
>   <lib dir="../../contrib/clustering/lib/" />
>   <lib dir="/total/crap/dir/ignored" /> 
> {noformat}
> Note these errors are also logged when running the example, even though there 
> are no {{<lib/>}} declarations that corrispond to them -- they seem to be 
> errors coming from the default behavior of looking for $solr_home/lib (which 
> is evidently happening twice?)...
> {noformat}
> Feb 15, 2011 4:52:03 PM org.apache.solr.core.SolrResourceLoader <init>
> INFO: Solr home set to 'solr/'
> Feb 15, 2011 4:52:03 PM org.apache.solr.core.SolrResourceLoader 
> addToClassLoader
> SEVERE: Can't find (or read) file to add to classloader: solr/./lib
> Feb 15, 2011 4:52:03 PM org.apache.solr.core.SolrResourceLoader <init>
> INFO: Solr home set to 'solr/./'
> Feb 15, 2011 4:52:03 PM org.apache.solr.core.SolrResourceLoader 
> addToClassLoader
> SEVERE: Can't find (or read) file to add to classloader: solr/././lib
> {noformat}

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