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https://issues.apache.org/jira/browse/SOLR-1419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754324#action_12754324
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Benson Margulies commented on SOLR-1419:
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I'll comment here and then open a feature request. Solr knows that it just
called into the class loader to locate a class by name. So it could certainly
include the name of what it was looking for in its exception, even if the VM
chooses to describe as the source of the problem.
> Solr won't load filters from parent class loader, and the resulting error
> stacktrace is very confusing
> ------------------------------------------------------------------------------------------------------
>
> Key: SOLR-1419
> URL: https://issues.apache.org/jira/browse/SOLR-1419
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 1.3
> Reporter: Benson Margulies
>
> I specified a token filter class in my schema, and provided that class in a
> jar file in the system classpath of my jetty instance instead of in
> WEB-INF/lib of my solr webapp.
> This did not work.
> To make matters odder, the logged error did not mention my filter, but rather
> an internal solr interface:
> Caused by: java.lang.ClassNotFoundException:
> org.apache.solr.util.plugin.ResourceLoaderAware
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:399)
> I note in passing that the token filter in turn uses other classes which
> stayed happily behind in the outer classloader after moved the immediate
> filter class into the webapp.
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