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https://issues.apache.org/jira/browse/SOLR-4852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039331#comment-14039331
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Shawn Heisey commented on SOLR-4852:
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Another theory I've considered is that the problem is caused by the resource
loader object being replaced, which from my research apparently has to be done
anytime you need to add another directory or list of jars. This theory would
be disproved by a setup that has more than one <lib> directive and uses classes
in jars from both locations ... and there are probably some of those out there.
I willingly admit that I do not understand what causes the problems that I
documented here. I looked into the Solr code and poked around the Java 7 API
javadocs, but I wasn't able to make sense of it.
> If sharedLib is set to lib, classloader fails to find classes in lib
> --------------------------------------------------------------------
>
> Key: SOLR-4852
> URL: https://issues.apache.org/jira/browse/SOLR-4852
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.4
> Environment: Linux bigindy5 2.6.32-358.6.1.el6.centos.plus.x86_64 #1
> SMP Wed Apr 24 03:21:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.7.0_21"
> Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
> Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
> Reporter: Shawn Heisey
> Fix For: 4.9, 5.0
>
> Attachments: SOLR-4852-test-failhard.txt, SOLR-4852.patch,
> SOLR-4852.patch
>
>
> I have some jars in the lib directory under solr.solr.home - DIH, ICU, and
> MySQL. If I set sharedLib in solr.xml to "lib" then the ICUTokenizer class
> is not found, even though the jar is loaded (twice) during Solr startup. If
> I set sharedLib to another location that doesn't exist, the jars are only
> loaded once and there is no problem.
> I'm using the old-style solr.xml on branch_4x revision 1485566.
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