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https://issues.apache.org/jira/browse/OPENNLP-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073014#comment-13073014
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Jörn Kottmann commented on OPENNLP-238:
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I see, the POS Model does not validates the dictionary when it is instantiated
with the constructor the cross validator, or training code uses.
That is an issue which we have across our models, the validation is only
performed when it is loaded from an Input Stream.
> BestSequence method in BeamSearch can cause NullPointerException if it can
> not find a valid sequence
> ----------------------------------------------------------------------------------------------------
>
> Key: OPENNLP-238
> URL: https://issues.apache.org/jira/browse/OPENNLP-238
> Project: OpenNLP
> Issue Type: Bug
> Components: POS Tagger
> Affects Versions: tools-1.5.2-incubating
> Reporter: William Colen
> Assignee: William Colen
> Fix For: tools-1.5.2-incubating
>
>
> I am using the standard sequence validator of POS Tagger with a
> TagDictionary. Sometimes there are no outcome that matches with the tags in
> the dictionary. That is causing a NullPointerException in bestSequence method.
> I think we should add an extra validation: if the heap 'next' still empty
> after advancing all valid sequences (line 159) we should let it advance
> invalid sequences. It would make the POS Tagger more robust.
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