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Date: Mon, 11 Dec 2006 23:09:23 -0800 (PST)
From: "Doron Cohen (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-740) Bugs in
 contrib/snowball/.../SnowballProgram.java -> Kraaij-Pohlmann gives
 Index-OOB Exception
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    [ http://issues.apache.org/jira/browse/LUCENE-740?page=comments#action_12457605 ] 
            
Doron Cohen commented on LUCENE-740:
------------------------------------

Attached "snowball.patch.txt" has "latest and greatest" plus new test case in TestSnowball that demostrates this Kp stemmer bug.

Lucene tests and contrib/snowball tests pass.


> Bugs in contrib/snowball/.../SnowballProgram.java -> Kraaij-Pohlmann gives Index-OOB Exception
> ----------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-740
>                 URL: http://issues.apache.org/jira/browse/LUCENE-740
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 1.9
>         Environment: linux amd64
>            Reporter: Andreas Kohn
>            Priority: Minor
>         Attachments: lucene-1.9.1-SnowballProgram.java, snowball.patch.txt
>
>
> (copied from mail to java-user)
> while playing with the various stemmers of Lucene(-1.9.1), I got an
> index out of bounds exception:
> lucene-1.9.1>java -cp
> build/contrib/snowball/lucene-snowball-1.9.2-dev.jar
> net.sf.snowball.TestApp Kp bla.txt
> Exception in thread "main" java.lang.reflect.InvocationTargetException
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>        at java.lang.reflect.Method.invoke(Method.java:615)
>        at net.sf.snowball.TestApp.main(TestApp.java:56)
> Caused by: java.lang.StringIndexOutOfBoundsException: String index out
> of range: 11
>        at java.lang.StringBuffer.charAt(StringBuffer.java:303)
>        at net.sf.snowball.SnowballProgram.find_among_b(SnowballProgram.java:270)
>        at net.sf.snowball.ext.KpStemmer.r_Step_4(KpStemmer.java:1122)
>        at net.sf.snowball.ext.KpStemmer.stem(KpStemmer.java:1997)
> This happens when executing
> lucene-1.9.1>java -cp
> build/contrib/snowball/lucene-snowball-1.9.2-dev.jar
> net.sf.snowball.TestApp Kp bla.txt
> bla.txt contains just this word: 'spijsvertering'.
> After some debugging, and some tests with the original snowball
> distribution from snowball.tartarus.org, it seems that the attached
> change is needed to avoid the exception.
> (The change comes from tartarus' SnowballProgram.java)

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