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From "Stefan Rusek (JIRA)" <>
Subject [jira] Created: (LUCENENET-102) GermanStemmer.cs has numerous string substring errors
Date Fri, 28 Sep 2007 13:15:51 GMT
GermanStemmer.cs has numerous string substring errors

                 Key: LUCENENET-102
             Project: Lucene.Net
          Issue Type: Bug
         Environment: Lucene.Net 2.0 using the GermanStemmer
            Reporter: Stefan Rusek

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
  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
  at Lucene.Net.Analysis.DE.GermanStemFilter.Next() in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemFilter.cs:line
  at Lucene.Net.Index.DocumentWriter.InvertDocument(Document doc) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\DocumentWriter.cs:line
  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
  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
  at Lucene.Net.Index.IndexWriter.AddDocument(Document doc) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\IndexWriter.cs:line

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