You need to use a constructor which is public and has no arguments. The parameters can be passed in only if you extend CustomFeatureGenerator. That one has an init method which gives you the attributes defined in the xml descriptor.
HTH, Jörn On Tue, Oct 25, 2016 at 12:43 PM, Damiano Porta <[email protected]> wrote: > Joern, > However i also tried with: > > public SpanFeatureGenerator(Map<String, String> properties, > FeatureGeneratorResourceProvider resourceProvider) throws > InvalidFormatException { > > } > > but i get the same exception. > Damiano > > 2016-10-25 12:30 GMT+02:00 Damiano Porta <[email protected]>: > > > This at the moment: > > > > public SpanFeatureGenerator(String prefix, Object finder, int > > prevWindowSize, int nextWindowSize) { > > > > System.out.println(prefix); > > System.out.println((String)finder); > > System.out.println(prevWindowSize); > > System.out.println(nextWindowSize); > > System.exit(1); > > > > } > > > > It is obviously a test to understand if my generator is called. > > > > > > 2016-10-25 12:23 GMT+02:00 Joern Kottmann <[email protected]>: > > > >> What is the constructor of the > >> com.damiano.parser.generator.SpanFeatureGenerator > >> class? > >> > >> Jörn > >> > >> On Tue, Oct 25, 2016 at 11:51 AM, Damiano Porta <[email protected] > > > >> wrote: > >> > >> > Hello, > >> > I have created a custom generator implementing the > >> AdaptiveFeatureGenerator > >> > interface. > >> > > >> > I am getting this error: > >> > > >> > Exception in thread "main" > >> > opennlp.tools.util.ext.ExtensionNotLoadedException: > >> > java.lang.InstantiationException: > >> > com.damiano.parser.generator.SpanFeatureGenerator > >> > at > >> > opennlp.tools.util.ext.ExtensionLoader.instantiateExtension( > >> > ExtensionLoader.java:72) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory$ > >> > CustomFeatureGeneratorFactory.create(GeneratorFactory.java:582) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory.createGenerator( > >> > GeneratorFactory.java:661) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory$ > >> > AggregatedFeatureGeneratorFactory.create(GeneratorFactory.java:129) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory.createGenerator( > >> > GeneratorFactory.java:661) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory$ > >> > CachedFeatureGeneratorFactory.create(GeneratorFactory.java:171) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory.createGenerator( > >> > GeneratorFactory.java:661) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory$ > >> > AggregatedFeatureGeneratorFactory.create(GeneratorFactory.java:129) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory.createGenerator( > >> > GeneratorFactory.java:661) > >> > at > >> > opennlp.tools.util.featuregen.GeneratorFactory.create( > >> > GeneratorFactory.java:711) > >> > at > >> > opennlp.tools.namefind.TokenNameFinderFactory. > createFeatureGenerators( > >> > TokenNameFinderFactory.java:153) > >> > at > >> > opennlp.tools.namefind.TokenNameFinderFactory.createContextGenerator( > >> > TokenNameFinderFactory.java:118) > >> > at opennlp.tools.namefind.NameFinderME.train(NameFinderME.java:333) > >> > at com.damiano.parser.trainer.NER.compileNER(NER.java:161) > >> > at com.damiano.parser.trainer.NER.main(NER.java:136) > >> > > >> > Caused by: java.lang.InstantiationException: > >> > com.damiano.parser.generator.SpanFeatureGenerator > >> > at java.lang.Class.newInstance(Class.java:427) > >> > at > >> > opennlp.tools.util.ext.ExtensionLoader.instantiateExtension( > >> > ExtensionLoader.java:70) > >> > ... 14 more > >> > > >> > Caused by: java.lang.NoSuchMethodException: > >> > com.damiano.parser.generator.SpanFeatureGenerator.<init>() > >> > at java.lang.Class.getConstructor0(Class.java:3082) > >> > at java.lang.Class.newInstance(Class.java:412) > >> > ... 15 more > >> > > >> > the xml is: > >> > > >> > <generators> > >> > <cache> > >> > <generators> > >> > <window prevLength="6" nextLength="3"> > >> > <tokenclass/> > >> > </window> > >> > <window prevLength="6" nextLength="3"> > >> > <token/> > >> > </window> > >> > <definition/> > >> > <prevmap/> > >> > <bigram/> > >> > <sentence begin="true" end="false"/> > >> > <custom class="com.damiano.parser.generator. > SpanFeatureGenerator" > >> > prefix="name" finder="blablabla" prevWindowSize="3" > nextWindowSize="3"/> > >> > </generators> > >> > </cache> > >> > </generators> > >> > > >> > What can i do? > >> > Thank you! > >> > > >> > Damiano > >> > > >> > > > > >
