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https://issues.apache.org/jira/browse/LUCENENET-102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533157
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Erich Eichinger commented on LUCENENET-102:
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just wanted to mention, that the German Stemmer for Lucene 1.4 suffered from
converting the string.substring() method from Java to NET. In java you specify
string.substring( firstIndex, lastIndex)
whereas in NET you specify
string.Substring( firstIndex, length )
I guess that's the case for the Snowball GermanStemmer as well
> GermanStemmer.cs has numerous string substring errors
> -----------------------------------------------------
>
> Key: LUCENENET-102
> URL: https://issues.apache.org/jira/browse/LUCENENET-102
> Project: Lucene.Net
> Issue Type: Bug
> Environment: Lucene.Net 2.0 using the GermanStemmer
> Reporter: Stefan Rusek
> Attachments: GermanStemmer.cs.diff
>
>
> When using the german stemmer that is included in the 2.0 release. The
> stemmer will throw ArgumentOutOfRangeException. We have fixed the issue
> in-house but wanted to get the fix incorporated into the actual Lucene.Net
> release so that future users don't have this problem. Below is an example
> stacktrace, and I will attach a diff as well.
> System.ArgumentOutOfRangeException: Index and length must refer to a location
> within the string.
> Parameter name: length
> at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32
> length, Boolean fAlwaysCopy)
> at Lucene.Net.Analysis.DE.GermanStemmer.Strip(StringBuilder buffer) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemmer.cs:line
> 88
> at Lucene.Net.Analysis.DE.GermanStemmer.Stem(String term) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemmer.cs:line
> 54
> at Lucene.Net.Analysis.DE.GermanStemFilter.Next() in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemFilter.cs:line
> 67
> at Lucene.Net.Index.DocumentWriter.InvertDocument(Document doc) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\DocumentWriter.cs:line
> 181
> at Lucene.Net.Index.DocumentWriter.AddDocument(String segment, Document
> doc) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\DocumentWriter.cs:line
> 106
> at Lucene.Net.Index.IndexWriter.AddDocument(Document doc, Analyzer
> analyzer) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\IndexWriter.cs:line
> 626
> at Lucene.Net.Index.IndexWriter.AddDocument(Document doc) in
> c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\IndexWriter.cs:line
> 613
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