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https://issues.apache.org/jira/browse/SOLR-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655772#comment-13655772
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Shingo Sasaki commented on SOLR-4813:
-------------------------------------

Hi, Jack. Thank you for your comment.
Do you mean that backward compatibility was lost? 

On samples of SOLR-319, the filter tag of SynonymFilterFactory has attributes, 
minGramSize and maxGramSize,
and TokenizerFactory's instance is inited by args in 
FSTSynonymFilterFactory.loadTokenizerFactory of Lucene 4.2.1's.
                
> Unavoidable IllegalArgumentException occurs when SynonymFilterFactory's 
> setting has tokenizer's parameter.
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-4813
>                 URL: https://issues.apache.org/jira/browse/SOLR-4813
>             Project: Solr
>          Issue Type: Bug
>          Components: Schema and Analysis
>    Affects Versions: 4.3
>            Reporter: Shingo Sasaki
>            Priority: Critical
>              Labels: SynonymFilterFactory
>
> When I write SynonymFilterFactory' setting in schema.xml as follows, ...
> {code:xml}
> <analyzer>
>   <tokenizer class="solr.NGramTokenizerFactory" maxGramSize="2" 
> minGramSize="2"/>
>   <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" 
> ignoreCase="true" expand="true"
>    tokenizerFactory="solr.NGramTokenizerFactory" maxGramSize="2" 
> minGramSize="2"/>
> </analyzer>
> {code}
> IllegalArgumentException ("Unknown parameters") occurs.
> {noformat}
> Caused by: java.lang.IllegalArgumentException: Unknown parameters: 
> {maxGramSize=2, minGramSize=2}
>       at 
> org.apache.lucene.analysis.synonym.FSTSynonymFilterFactory.<init>(FSTSynonymFilterFactory.java:71)
>       at 
> org.apache.lucene.analysis.synonym.SynonymFilterFactory.<init>(SynonymFilterFactory.java:50)
>       ... 28 more
> {noformat}
> However TokenizerFactory's params should be set to loadTokenizerFactory 
> method in [FST|Slow]SynonymFilterFactory. (ref. SOLR-2909)
> I think, the problem was caused by LUCENE-4877 ("Fix analyzer factories to 
> throw exception when arguments are invalid") and SOLR-3402 ("Parse Version 
> outside of Analysis Factories").

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