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https://issues.apache.org/jira/browse/SOLR-1425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754589#action_12754589
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Benson Margulies commented on SOLR-1425:
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Here's some relevant backtrace.
Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: 347
Launcher$AppClassLoader.loadClass(String, boolean) line: 330
Launcher$AppClassLoader(ClassLoader).loadClass(String) line: 254
WebAppClassLoader.loadClass(String, boolean) line: 379
WebAppClassLoader.loadClass(String) line: 341
WebAppClassLoader(ClassLoader).loadClassInternal(String) line: 399
Class<T>.forName0(String, boolean, ClassLoader) line: not available [native
method]
Class<T>.forName(String, boolean, ClassLoader) line: 247
SolrResourceLoader.findClass(String, String...) line: 257
SolrResourceLoader.newInstance(String, String...) line: 278
IndexSchema$4(AbstractPluginLoader<T>).create(ResourceLoader, String, String,
Node) line: 83
IndexSchema$4(AbstractPluginLoader<T>).load(ResourceLoader, NodeList) line: 140
> Better exception messages for classloader mishaps
> -------------------------------------------------
>
> Key: SOLR-1425
> URL: https://issues.apache.org/jira/browse/SOLR-1425
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Benson Margulies
>
> If an idiot such as myself tries to specify a filter or such that lives in a
> parent classloader, such as the system classloader of a servlet container,
> Solr will fail to load it. The JVM is prone to create an exception that
> mentions some Solr interface as being missing instead of the filter itself.
> It would be less confusing for the miscreant if Solr were to try/catch
> ClassNotFound and NoClassDefError and throw its own exception with the name
> of the thing specified in the schema included in the message.
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