[jira] [Closed] (OPENNLP-1520) Generated Java code for stemmers is broken, and should be re-generated

["Richard Zowalla (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OPENNLP-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Zowalla closed OPENNLP-1520.
------------------------------------
    Resolution: Fixed

> Generated Java code for stemmers is broken, and should be re-generated
> ----------------------------------------------------------------------
>
>                 Key: OPENNLP-1520
>                 URL: https://issues.apache.org/jira/browse/OPENNLP-1520
>             Project: OpenNLP
>          Issue Type: Bug
>          Components: Stemmer
>    Affects Versions: 2.3.0, 2.3.1
>            Reporter: Jon Marius Venstad
>            Assignee: Richard Zowalla
>            Priority: Major
>             Fix For: 2.3.2
>
>
> The recursive stemming, which seems hard to actually trigger, but which is the intended usage of the {{methodObject and method}} in the {{Among}} class (called reflectively) is completely broken. First off, it tries to invoke a private method from outside the class (from a parent class, the {{{}SnowballProgram{}}}), which fails with an illegal access exception; if that worked, it would also have invoked _all_ such method calls on the {_}same, shared, static object{_}—not on the relevant stemmer instance. 
> This was fixed 8 years ago, but it looks like the generated code in the opennlp-tools is 10 years old. I would urge you to re-generate that code. 
>  
> Commit that fixed the Java code generation: [https://github.com/snowballstem/snowball/commit/0f9d3d64ab965447a7f638b8ededc924f3efca75]
>  
> Relevant sample stemmer with broken Java:
> [https://github.com/apache/opennlp/blob/main/opennlp-tools/src/main/java/opennlp/tools/stemmer/snowball/finnishStemmer.java]
>  
> Stack trace showing illegal reflection access:
>  
> {noformat}
> 2023-10-26 23:21:44.200 class opennlp.tools.stemmer.snowball.SnowballProgram cannot access a member of class opennlp.tools.stemmer.snowball.finnishStemmer with modifiers "private" 
> exception=java.lang.IllegalAccessException: class opennlp.tools.stemmer.snowball.SnowballProgram cannot access a member of class opennlp.tools.stemmer.snowball.finnishStemmer with modifiers "private"
>   at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392) 
>   at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674) 
>   at java.base/java.lang.reflect.Method.invoke(Method.java:560) 
>   at opennlp.tools.stemmer.snowball.SnowballProgram.find_among_b(SnowballProgram.java:353) 
>   at opennlp.tools.stemmer.snowball.finnishStemmer.r_case_ending(finnishStemmer.java:480) 
>   at opennlp.tools.stemmer.snowball.finnishStemmer.stem(finnishStemmer.java:1003) 
>   at opennlp.tools.stemmer.snowball.SnowballStemmer.stem(SnowballStemmer.java:131) 
>   at com.yahoo.language.opennlp.OpenNlpTokenizer.processToken(OpenNlpTokenizer.java:64) 
>   at com.yahoo.language.opennlp.OpenNlpTokenizer.lambda$tokenize$0(OpenNlpTokenizer.java:54) 
>   at com.yahoo.language.simple.SimpleTokenizer.tokenize(SimpleTokenizer.java:74) 
>   at com.yahoo.language.opennlp.OpenNlpTokenizer.tokenize(OpenNlpTokenizer.java:54) 
>   at com.yahoo.vespa.indexinglanguage.linguistics.LinguisticsAnnotator.annotate(LinguisticsAnnotator.java:76)
> ...{noformat}
>  
>  
> Best, Jon Marius Venstad, developer at [vespa.ai|http://vespa.ai/]



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