[LUCENE-740] Bugs in contrib/snowball/.../SnowballProgram.java -> Kraaij-Pohlmann gives Index-OOB Exception

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.9
• Component/s: modules/analysis

Environment

linux amd64

• Lucene Fields: New, Patch Available
• Assignee: Unassigned
• Reporter: Andreas Kohn
• Created: 11/Dec/06 19:38
• Updated: 28/Aug/22 11:32
• Resolved: 23/Aug/08 22:05

Description

(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)

Issue Links

• relates to: LUCENE-1142 Updated Snowball package