private static String readRestUrl() throws IOException {
        Properties nltkProperties = new Properties();
        nltkProperties.load(NLTKNERecogniser.class.getResourceAsStream("NLTKServer.properties"));

        return nltkProperties.getProperty("nltk.server.url");
    }
some common entities identified by NLTK
tika-parsers/tika-parsers-ml/tika-parser-nlp-module/src/main/java/org/apache/tika/parser/ner/nltk/NLTKNERecogniser.java