Neil Ireson commented on OPENNLP-1017:

I'm having the same issue and it's reproducible and I believe I have located 
the bug.

In the TokenNameFinderCrossValidator class evaluate method:

When calling NameFinderME.train(... the trainingSampleStream is incorrectly 
wrapped in the DocumentToNameSampleStream class. This means that no events are 
found. Removing the surrounding class seems to fix the issue.

I will download the source and submit a patch if someone doesn't beat me to it.

PS I couldn't reopen this issue so hopefully this won't be lost. If I don't 
hear from anyone I'll clone the issue.

> OpenNlp NameFinderCrossValidation gives InsufficientTrainingDataException
> -------------------------------------------------------------------------
>                 Key: OPENNLP-1017
>                 URL: https://issues.apache.org/jira/browse/OPENNLP-1017
>             Project: OpenNLP
>          Issue Type: Bug
>            Reporter: Saurabh Jain
> OpenNlp NameFinderCrossValidation gives InsufficientTrainingDataException.
> With nfold value 3, I tried to cross validate NameFinder training data. After 
> doing a research I got to know that first partition is assinged null data.

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