public class WordCountApp {

    private static final Logger logger = LogManager.getLogger();

    public static void main(final String[] args) {

​

        Properties props = new Properties();

        props.put(StreamsConfig.APPLICATION_ID_CONFIG, AppConfigs.applicationID);

        props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, AppConfigs.bootstrapServers);

        props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass());

        props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG,Serdes.String().getClass());

        props.put(StreamsConfig.STATE_DIR_CONFIG,AppConfigs.stateStoreLocation);

​

        StreamsBuilder streamsBuilder = new StreamsBuilder();

        KStream<String,String> KS0 = streamsBuilder.stream(AppConfigs.topicName);

        KStream<String,String> KS1 = KS0.flatMapValues(v-> Arrays.asList(v.toLowerCase().split(" ")));

​

        KGroupedStream<String,String> KGS1 = KS1.groupBy((k,v)-> v);

        KTable<String,Long> KT1 = KGS1.count();

        KT1.toStream().print(Printed.<String,Long>toSysOut().withLabel("KT1"));

​

        KafkaStreams streams = new KafkaStreams(streamsBuilder.build(), props);

        streams.start();

​

        Runtime.getRuntime().addShutdownHook(new Thread(() -> {

            logger.info("Shutting down stream");

            streams.close();

        }));

    }

}

​