LangDetectBug.java

package com.optimaize.langdetect;

import com.google.common.base.Optional;
import com.optimaize.langdetect.i18n.LdLocale;
import com.optimaize.langdetect.ngram.NgramExtractors;
import com.optimaize.langdetect.profiles.LanguageProfile;
import com.optimaize.langdetect.profiles.LanguageProfileReader;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

class LangDetectBug {

  // Not properly detected as German with shortTextAlgorithm(500):
  private final static String text = "Den Vogel kennt man am Gesang, den Topf an dem Klang, den Esel an den Ohren und am Gesang den Toren.";

  public static void main(String[] args) throws IOException {
    LanguageProfileReader profileReader = new LanguageProfileReader();
    List<LanguageProfile> profiles = profileReader.read(Arrays.asList("de", "nl"));
    LanguageDetector languageDetector = LanguageDetectorBuilder.create(NgramExtractors.standard())
            .shortTextAlgorithm(500)
            .withProfiles(profiles)
            .build();
    Optional<LdLocale> detect = languageDetector.detect(text);
    System.out.println(detect);
  }

}