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From "Uwe Schindler (JIRA)" <>
Subject [jira] [Assigned] (SOLR-4652) Resource loader has broken behavior for solr.xml plugins (basically ShardHandlerFactory)
Date Mon, 01 Apr 2013 15:47:16 GMT


Uwe Schindler reassigned SOLR-4652:

    Assignee: Uwe Schindler

Hi Ryan,
I will take care of this issue. Thanks for spending your time in fixing the resource/classloader

I will review your patch more closely and will commit it for 4.x and trunk.
> Resource loader has broken behavior for solr.xml plugins (basically ShardHandlerFactory)
> ----------------------------------------------------------------------------------------
>                 Key: SOLR-4652
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Ryan Ernst
>            Assignee: Uwe Schindler
>         Attachments: SOLR-4652.patch, SOLR-4652.patch
> I have the following scenario:
> MyShardHandlerFactory is plugged in via solr.xml.  The jar containing MyShardHandlerFactory
is in the shared lib dir.  There are a couple issues:
> 1. From within a per core handler (that is loaded within the core's lib dir), you grab
the ShardHandlerFactory from CoreContainer, casting to MyShardHandlerFactory will results
in a ClassCastException with a message like "cannot cast instance of MyShardHandlerFactory
to MyShardHandlerFactory".
> 2. Adding a custom dir for shared lib (for example "mylib") does not work.  The ShardHandlerFactory
is initialized before sharedLib is loaded.
> I've been pouring through the code on this and I don't see an easy fix.  I'll keep looking
at it, but I wanted to get this up so hopefully others have some thoughts on how best to fix.
 IMO, it seems like there needs to be a clear chain of resource loaders (one for loading solr.xml,
a child for loading the lib dir, used for solr.xml plugins, a grandchild for per core config,
and a great grandchild for per core lib dir based plugins).  Right now there are some siblings,
because any place a SolrResourceLoader is created with a null parent classloader, it gets
the jetty thread's classloader as the parent.

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