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https://issues.apache.org/jira/browse/LUCENE-4440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464728#comment-13464728
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Uwe Schindler commented on LUCENE-4440:
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This is the same chicken-and-egg problem the ICU4J project had with one
Japanese Locale. The problem here is, that Codec.forName() cannot be used
before SPI loading is finished. The problem here is that SPI loads all codec
names and creates instances from them. But at the time of creating those
instances, the lookup does not yet work.
I agree we should add a null check in SPILoader's lookup method (not
Codec.forName) to throw IllegalStateException("Cannot requests codec until
service provider interface has finished loading them").
> FilterCodec should take a delegate Codec in its ctor
> ----------------------------------------------------
>
> Key: LUCENE-4440
> URL: https://issues.apache.org/jira/browse/LUCENE-4440
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Minor
> Attachments: LUCENE-4440.patch
>
>
> FilterCodec has a delegate() method through which an extension can return its
> delegate Codec. This method is called on every Codec method. Adrien, on
> LUCENE-4391, failed to pass a Codec in the ctor, since he couldn't called
> Codec.forName().
> Instead, we should just pass e.g. new Lucene40Codec(). I'll post a patch
> shortly.
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