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List:       lucene-dev
Subject:    [jira] Created: (LUCENE-2182) DEFAULT_ATTRIBUTE_FACTORY faills to
From:       "Uwe Schindler (JIRA)" <jira () apache ! org>
Date:       2009-12-28 9:58:29
Message-ID: 581905143.1261994309433.JavaMail.jira () brutus ! apache ! org
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DEFAULT_ATTRIBUTE_FACTORY faills to load implementation class when iterface comes \
                from different classloader
------------------------------------------------------------------------------------------------------------


                 Key: LUCENE-2182
                 URL: https://issues.apache.org/jira/browse/LUCENE-2182
             Project: Lucene - Java
          Issue Type: Bug
          Components: Other
    Affects Versions: 3.0, 2.9.1
            Reporter: Uwe Schindler
            Assignee: Uwe Schindler


This is a followup for \
[http://www.lucidimagination.com/search/document/1724fcb3712bafba/using_the_new_tokenizer_api_from_a_jar_file]:


The DEFAULT_ATTRIBUTE_FACTORY should load the implementation class for a given \
attribute interface from the same classloader like the attribute interface. The \
current code loads it from the classloader of the lucene-core.jar file. In solr this \
fails when the interface is in a JAR file coming from the plugins folder. 

The interface is loaded correctly, because the addAttribute(FooAttribute.class) loads \
the FooAttribute.class from the plugin code and this with success. But as \
addAttribute tries to load the class from its local lucene-core.jar classloader it \
will not find the attribute.

The fix is to tell Class.forName to use the classloader of the corresponding \
interface, which is the correct way to handle it, as the impl and the attribute \
should always be in the same classloader and file.

I hope I can somehow add a test for that.

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