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From "Katrin Tomanek (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENNLP-429) Create a Factory to customize the POS Tagger
Date Wed, 15 Feb 2012 09:04:03 GMT

    [ https://issues.apache.org/jira/browse/OPENNLP-429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208285#comment-13208285
] 

Katrin Tomanek commented on OPENNLP-429:
----------------------------------------

when I use the trainer tool with this code

POSTaggerTrainerTool trainerTool = new POSTaggerTrainerTool();
trainerTool.run("opennlp",args);


I get the following NullPointerException

Exception in thread "main" java.lang.NullPointerException
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:169)
	at opennlp.tools.util.BaseToolFactory.loadSubclass(BaseToolFactory.java:153)
	at opennlp.tools.postag.POSTaggerFactory.create(POSTaggerFactory.java:203)
	at opennlp.tools.cmdline.postag.POSTaggerTrainerTool.run(POSTaggerTrainerTool.java:100)
	at de.averbis.extraction.ae.pos_tagger_maxent.utils.ModelTrainer.main(ModelTrainer.java:22)


--> this is presumably because I didn't explicitly set a factory; in this case, either
the trainer tool needs to be changed (factory as an obligatory parameter) or you need to use
a default factory if none is given
                
> Create a Factory to customize the POS Tagger
> --------------------------------------------
>
>                 Key: OPENNLP-429
>                 URL: https://issues.apache.org/jira/browse/OPENNLP-429
>             Project: OpenNLP
>          Issue Type: New Feature
>          Components: Command Line Interface, POS Tagger
>    Affects Versions: tools-1.5.3-incubating
>            Reporter: William Colen
>            Assignee: William Colen
>            Priority: Minor
>             Fix For: tools-1.5.3-incubating
>
>
> Should provide a mechanism to customize the POS Tagger using a factory. The component
should get the following objects from the factory:
> - Context Generator
> - Sequence Validator
> - POS Dictionary implementation
> One issue to solve is how to initialize the objects. For example, the Sequence Validator
might be initialized using a POS Dictionary.

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