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https://issues.apache.org/jira/browse/LUCENE-2899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466478#comment-13466478
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mailformailingli...@yahoo.de commented on LUCENE-2899:
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Could you please create a new Patch for the current Trunk? I had some problems 
on applying it to my working copy...

I am not entirely sure whether its the Trunk or your Code, but it seems like 
your OpenNLP-code only works for the first request.

As far as I was able to debug, the create()-method of the TokenFilterFactory is 
only called every now and again (are created TokenFilters reused for longer 
than one call in Solr?).

If create() of your FilterFactory was called, everything works. However if the 
TokenFilter is somehow reused, it fails. 

Is this a bug of Solr or of your Patch?
                
> Add OpenNLP Analysis capabilities as a module
> ---------------------------------------------
>
>                 Key: LUCENE-2899
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2899
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/analysis
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: LUCENE-2899.patch, LUCENE-2899.patch, LUCENE-2899.patch, 
> LUCENE-2899.patch, LUCENE-2899.patch, LUCENE-2899.patch, opennlp_trunk.patch
>
>
> Now that OpenNLP is an ASF project and has a nice license, it would be nice 
> to have a submodule (under analysis) that exposed capabilities for it. Drew 
> Farris, Tom Morton and I have code that does:
> * Sentence Detection as a Tokenizer (could also be a TokenFilter, although it 
> would have to change slightly to buffer tokens)
> * NamedEntity recognition as a TokenFilter
> We are also planning a Tokenizer/TokenFilter that can put parts of speech as 
> either payloads (PartOfSpeechAttribute?) on a token or at the same position.
> I'd propose it go under:
> modules/analysis/opennlp

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