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https://issues.apache.org/jira/browse/SOLR-16203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17801977#comment-17801977
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Jan Høydahl commented on SOLR-16203:
------------------------------------
Reviving this and adding a draft PR, please have a look and advise
> Using SPI lookups of analysis components results in factories that don't get
> ResourceLoaderAware.inform called on them (When using
> ClassicIndexSchemaFactory)
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-16203
> URL: https://issues.apache.org/jira/browse/SOLR-16203
> Project: Solr
> Issue Type: Bug
> Affects Versions: 9.0
> Reporter: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-16203_test.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Ok ... this is a weird one ...
> SOLR-13593 modified {{FieldTypePluginLoader}} to add the ability for analysis
> Factories to be resolved by SPI name (ex: {{{}name="stop"{}}}, instead of by
> "short class name" (ex: {{{}class="solr.StopFilterFactory"{}}}.
> The code that deals with this just calls (for example)
> {{TokenFilterFactory.forName(name, params);}} and uses the resulting factory
> "as is" – But these means that nothing calls the {{inform(ResourceLoader)}}
> on any factories that implement {{ResourceLoaderAware}} (such as
> {{StopFilterFactory}} or {{{}SynonymGraphFilterFactory{}}})
> In the "short class name" code path (the only option prior to 9.0), the
> {{SolrResourceLoader}} is used to initialize the Factory, and
> {{SolrResourceLoader..newInstance(...)}} takes responsibility of calling
> {{factory.inform(this)}} on everything it instantiates that implements
> {{ResourceLoaderAware}} (as well as some other checks: like
> {{{}SolrCoreAware{}}})
> This discrepancy means that when using the {{name="foo"}} syntax, many
> factories won't be fully initialized – or fail on invalid input – during
> schema initialization. In the case of things like {{StopFilterFactory}} or
> {{SynonymGraphFilterFactory}}) the problem will manifest as some type of
> runtime error when the factory's {{create(...)}} method is called as part of
> creating a new index or query Analyzer.
> ----
> _*...BUT...*_
> ----
> This problem only seems to manifest itself when using
> {{ClassicIndexSchemaFactory}} -- which is why it's not readily apparent when
> using the default configset, or something like {{bin/solr -e techproducts}}
> (but is trivial to reproduce in testcases (since almost every "test"
> solrconfig uses {{ClassicIndexSchemaFactory}})
> I have no idea _why_ using {{ManagedIndexSchemaFactory}} doesn't manifest the
> same problem -- it should be using the same {{FieldTypePluginLoader}} under
> the covers -- but clearly something specific to {{ManagedIndexSchema}} is
> taking responsibility for calling {{ResourceLoaderAware.inform(...)}}
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