Support for users of CCG software closed 7-27-20

[Nicholas Rizzolo <rizzolo AT gmail.com>]

Hi Lars,

Please see my comments inline:

On Wed, Apr 6, 2011 at 4:18 AM, Lars Buitinck 
<larsmans AT gmail.com>
 wrote:
> Hello,
>
> I have a named-entity recognizer in LBJ that used to work, until I upgraded
> to 2.8.1. I get the error
>
>
> Generating code for NEClassifier
> Generating code for BioRecognizer
> Compiling generated code
> Training BioRecognizer
>   BioRecognizer, pre-extract: 0 examples at Wed Apr 06 10:23:50 CEST 2011
> Exception in thread "BioRecognizer" java.lang.InstantiationError:
> LBJ2.classify.DiscreteFeature
>     at nl.larsmans.ner.BioLabel.classify(BioLabel.java:41)
>     at LBJ2.learn.Learner.getExampleArray(Learner.java:675)
>     at nl.larsmans.ner.BioRecognizer.getExampleArray(BioRecognizer.java:734)
>     at LBJ2.learn.Learner.getExampleArray(Learner.java:640)
>     at nl.larsmans.ner.BioRecognizer.getExampleArray(BioRecognizer.java:723)
>     at LBJ2.learn.BatchTrainer.preExtract(BatchTrainer.java:510)
>     at LBJ2.learn.BatchTrainer.preExtract(BatchTrainer.java:363)
>     at LBJ2.Train$TrainingThread.preExtractAndPrune(Train.java:714)
>     at LBJ2.Train$TrainingThread.run(Train.java:885)
> Compiling generated code
> javac: no source files
> Usage: javac <options> <source files>
> use -help for a list of possible options

Initially this looks strange to me since DiscreteFeature is now an
abstract class and can't be instantiated.  Did you upgrade from a
version less than 2.8.0?

> When I check my generated_java directory, BioLabel.java isn't there, while
> it is defined in my .lbj file as
>
> discrete BioLabel(Token tok) <- { return tok.bioLabel; }
>
> Any idea what could cause this?

Now I'm guessing you just need to make sure you've cleaned out every
old .class file and LBJ-generated source file from before the upgrade.
 This may involve scouring your CLASSPATH to ensure you've found them
all.

Let me know if you still have issues after doing so.

 - Nick


> Regards,
> Lars Buitinck
> Scientific programmer, U. Amsterdam
>
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