kafka.utils.TestUtils Java Examples

@Override
protected KafkaConfig getKafkaConfig(int brokerId) {
    final Option<File> trustStoreFileOption = Option.apply(null);
    final Option<SecurityProtocol> saslInterBrokerSecurityProtocol =
        Option.apply(SecurityProtocol.SASL_PLAINTEXT);
    Properties props = TestUtils.createBrokerConfig(
        brokerId, zkConnect, false, false, TestUtils.RandomPort(), saslInterBrokerSecurityProtocol,
        trustStoreFileOption, EMPTY_SASL_PROPERTIES, false, true, TestUtils.RandomPort(),
        false, TestUtils.RandomPort(),
        false, TestUtils.RandomPort(), Option.<String>empty(), 1, false, 1, (short) 1);

    injectProperties(props);
    props.setProperty("zookeeper.connection.timeout.ms", "30000");
    props.setProperty("sasl.mechanism.inter.broker.protocol", "GSSAPI");
    props.setProperty(SaslConfigs.SASL_ENABLED_MECHANISMS, "GSSAPI");

    return KafkaConfig.fromProps(props);
}
 

@Before
public void setUp() throws Exception {
    zookeeper = new EmbeddedZookeeper();
    zkConnect = String.format("localhost:%d", zookeeper.port());

    configs = new Vector<>();
    servers = new Vector<>();
    for (int i = 0; i < numBrokers; i++) {
        KafkaConfig config = getKafkaConfig(i);
        configs.add(config);

        KafkaServer server = TestUtils.createServer(config, Time.SYSTEM);
        servers.add(server);
    }

    String[] serverUrls = new String[servers.size()];
    ListenerName listenerType = ListenerName.forSecurityProtocol(getSecurityProtocol());
    for (int i = 0; i < servers.size(); i++) {
        serverUrls[i] =
            Utils.formatAddress(
                servers.get(i).config().advertisedListeners().head().host(),
                servers.get(i).boundPort(listenerType)
            );
    }
    bootstrapServers = Utils.join(serverUrls, ",");
}
 

@Test
public void test_1() throws Exception {

    KafkaMessageSenderPool<byte[], byte[]> pool1 = new KafkaMessageSenderPool<byte[], byte[]>();

    pool1.getSender();

    pool1.setConfig(new DefaultResourceLoader()
            .getResource("kafka/producer.properties"));

    pool1.setProps(TestUtils.getProducerConfig("localhost:" + port));
    pool1.setPoolSize(2);
    pool1.init();
    pool1.destroy();

    KafkaMessageSenderPool<byte[], byte[]> pool2 = new KafkaMessageSenderPool<byte[], byte[]>();

    pool2.setConfig(new DefaultResourceLoader()
            .getResource("kafka/producer.properties"));

    pool2.setProps(TestUtils.getProducerConfig("localhost:" + port));
    pool2.setPoolSize(0);
    pool2.init();
    pool2.destroy();

}
 

@BeforeClass
public static void setUpClass() throws Exception {
  int zkConnectionTimeout = 6000;
  int zkSessionTimeout = 6000;

  zookeeper = new EmbeddedZookeeper();
  zkConnect = String.format("127.0.0.1:%d", zookeeper.port());
  zkUtils = ZkUtils.apply(
      zkConnect, zkSessionTimeout, zkConnectionTimeout,
      JaasUtils.isZkSecurityEnabled());

  port = NetworkUtils.getRandomPort();
  kafkaServer = TestUtil09.createKafkaServer(port, zkConnect);
  for (int i = 0; i < topics.length; i++) {
    topics[i] = UUID.randomUUID().toString();
    AdminUtils.createTopic(zkUtils, topics[i], 1, 1, new Properties());

    TestUtils.waitUntilMetadataIsPropagated(
        scala.collection.JavaConversions.asScalaBuffer(Arrays.asList(kafkaServer)),
        topics[i], 0, 5000);
  }
}
 

@BeforeClass
public static void setUpClass() throws IOException {
    // setup Zookeeper
    zkServer = new EmbeddedZookeeper();
    zkConnect = ZKHOST + ":" + zkServer.port();
    zkClient = new ZkClient(zkConnect, 30000, 30000, ZKStringSerializer$.MODULE$);
    ZkUtils zkUtils = ZkUtils.apply(zkClient, false);

    // setup Broker
    Properties brokerProps = new Properties();
    brokerProps.setProperty("zookeeper.connect", zkConnect);
    brokerProps.setProperty("broker.id", "0");
    brokerProps.setProperty("log.dirs", Files.createTempDirectory("kafka-").toAbsolutePath().toString());
    brokerProps.setProperty("listeners", "PLAINTEXT://" + BROKERHOST + ":" + BROKERPORT);
    KafkaConfig config = new KafkaConfig(brokerProps);
    Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);

    // create topic
    AdminUtils.createTopic(zkUtils, TOPIC, 1, 1, new Properties(), RackAwareMode.Disabled$.MODULE$);

}
 

@BeforeClass
public static void setUpClass() throws IOException {
    // setup Zookeeper
    zkServer = new EmbeddedZookeeper();
    zkConnect = ZKHOST + ":" + zkServer.port();
    zkClient = new ZkClient(zkConnect, 30000, 30000, ZKStringSerializer$.MODULE$);
    ZkUtils zkUtils = ZkUtils.apply(zkClient, false);

    // setup Broker
    Properties brokerProps = new Properties();
    brokerProps.setProperty("zookeeper.connect", zkConnect);
    brokerProps.setProperty("broker.id", "0");
    brokerProps.setProperty("log.dirs", Files.createTempDirectory("kafkaUtils-").toAbsolutePath().toString());
    brokerProps.setProperty("listeners", "PLAINTEXT://" + BROKERHOST + ":" + BROKERPORT);
    KafkaConfig config = new KafkaConfig(brokerProps);
    Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);

    // create topics
    AdminUtils.createTopic(zkUtils, TOPIC_R, 1, 1, new Properties(), RackAwareMode.Disabled$.MODULE$);
    AdminUtils.createTopic(zkUtils, TOPIC_S, 1, 1, new Properties(), RackAwareMode.Disabled$.MODULE$);

}
 

/**
 * Starts the Embedded Kafka and Zookeeper Servers.
 * @throws Exception - If an exeption occurs during startup.
 */
protected void startup() throws Exception {
    // Setup the embedded zookeeper
    logger.info("Starting up Embedded Zookeeper...");
    zkServer = new EmbeddedZookeeper();
    zookeperConnect = ZKHOST + ":" + zkServer.port();
    logger.info("Embedded Zookeeper started at: {}", zookeperConnect);

    // setup Broker
    logger.info("Starting up Embedded Kafka...");
    brokerPort = Integer.toString(PortUtils.getRandomFreePort());
    final Properties brokerProps = new Properties();
    brokerProps.setProperty(KafkaConfig$.MODULE$.BrokerIdProp(), "0");
    brokerProps.setProperty(KafkaConfig$.MODULE$.HostNameProp(), BROKERHOST);
    brokerProps.setProperty(KafkaConfig$.MODULE$.PortProp(), brokerPort);
    brokerProps.setProperty(KafkaConfig$.MODULE$.ZkConnectProp(), zookeperConnect);
    brokerProps.setProperty(KafkaConfig$.MODULE$.LogDirsProp(), Files.createTempDirectory(getClass().getSimpleName() + "-").toAbsolutePath().toString());
    brokerProps.setProperty(KafkaConfig$.MODULE$.DeleteTopicEnableProp(), "true");
    final KafkaConfig config = new KafkaConfig(brokerProps);
    final Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);
    logger.info("Embedded Kafka Server started at: {}:{}", BROKERHOST, brokerPort);
}
 

@BeforeClass
public static void setUpClass() throws IOException {
    // setup Zookeeper
    zkServer = new EmbeddedZookeeper();
    zkConnect = ZKHOST + ":" + zkServer.port();
    zkClient = new ZkClient(zkConnect, 30000, 30000, ZKStringSerializer$.MODULE$);
    ZkUtils zkUtils = ZkUtils.apply(zkClient, false);

    // setup Broker
    Properties brokerProps = new Properties();
    brokerProps.setProperty("zookeeper.connect", zkConnect);
    brokerProps.setProperty("broker.id", "0");
    brokerProps.setProperty("log.dirs", Files.createTempDirectory("kafka-").toAbsolutePath().toString());
    brokerProps.setProperty("listeners", "PLAINTEXT://" + BROKERHOST + ":" + BROKERPORT);
    KafkaConfig config = new KafkaConfig(brokerProps);
    Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);

    // create topics        
    AdminUtils.createTopic(zkUtils, TOPIC_OOS, 1, 1, new Properties(), RackAwareMode.Disabled$.MODULE$);

}
 

/**
 * setup mini kafka and call the super to setup mini fluo
 */
@Before
public void setupKafka() throws Exception {
    // Install an instance of Rya on the Accumulo cluster.
    installRyaInstance();

    // Setup Kafka.
    zkServer = new EmbeddedZookeeper();
    final String zkConnect = ZKHOST + ":" + zkServer.port();
    zkClient = new ZkClient(zkConnect, 30000, 30000, ZKStringSerializer$.MODULE$);
    zkUtils = ZkUtils.apply(zkClient, false);

    // setup Broker
    final Properties brokerProps = new Properties();
    brokerProps.setProperty("zookeeper.connect", zkConnect);
    brokerProps.setProperty("broker.id", "0");
    brokerProps.setProperty("log.dirs", Files.createTempDirectory("kafka-").toAbsolutePath().toString());
    brokerProps.setProperty("listeners", "PLAINTEXT://" + BROKERHOST + ":" + BROKERPORT);
    final KafkaConfig config = new KafkaConfig(brokerProps);
    final Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);
}
 

public static void startServer() throws RuntimeException {
  if (serverStarted && serverClosed) {
    throw new RuntimeException("Kafka test server has already been closed. Cannot generate Kafka server twice.");
  }

  if (!serverStarted) {
    serverStarted = true;
    zkConnect = TestZKUtils.zookeeperConnect();
    zkServer = new EmbeddedZookeeper(zkConnect);
    zkClient = new ZkClient(zkServer.connectString(), 30000, 30000, ZKStringSerializer$.MODULE$);

    kafkaPort = TestUtils.choosePort();
    Properties props = TestUtils.createBrokerConfig(brokerId, kafkaPort, true);

    KafkaConfig config = new KafkaConfig(props);
    Time mock = new MockTime();
    kafkaServer = TestUtils.createServer(config, mock);
  }
}
 

public void publish(String topic, List<String> messages)
{
  Properties producerProps = new Properties();
  producerProps.setProperty("bootstrap.servers", BROKERHOST + ":" + BROKERPORT);
  producerProps.setProperty("key.serializer", "org.apache.kafka.common.serialization.IntegerSerializer");
  producerProps.setProperty("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");

  try (KafkaProducer<Integer, byte[]> producer = new KafkaProducer<>(producerProps)) {
    for (String message : messages) {
      ProducerRecord<Integer, byte[]> data = new ProducerRecord<>(topic, message.getBytes(StandardCharsets.UTF_8));
      producer.send(data);
    }
  }

  List<KafkaServer> servers = new ArrayList<KafkaServer>();
  servers.add(kafkaServer);
  TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(servers), topic, 0, 30000);
}
 

@Before
public void setUp() throws Exception {
    zookeeper = new EmbeddedZookeeper();
    zkConnect = String.format("localhost:%d", zookeeper.port());

    configs = new Vector<>();
    servers = new Vector<>();
    for (int i = 0; i < numBrokers; i++) {
        KafkaConfig config = getKafkaConfig(i);
        configs.add(config);

        KafkaServer server = TestUtils.createServer(config, Time.SYSTEM);
        servers.add(server);
    }

    String[] serverUrls = new String[servers.size()];
    ListenerName listenerType = ListenerName.forSecurityProtocol(getSecurityProtocol());
    for (int i = 0; i < servers.size(); i++) {
        serverUrls[i] =
            Utils.formatAddress(
                servers.get(i).config().advertisedListeners().head().host(),
                servers.get(i).boundPort(listenerType)
            );
    }
    bootstrapServers = Utils.join(serverUrls, ",");
}
 

private void initProducer(String bootstrapServer) {
  producer = TestUtils.createProducer(
      bootstrapServer,
      1,
      60 * 1000L,
      1024L * 1024L,
      0,
      0L,
      5 * 1000L,
      SecurityProtocol.PLAINTEXT,
      null,
      Option$.MODULE$.<Properties>apply(new Properties()),
      new StringSerializer(),
      new ByteArraySerializer(),
      Option$.MODULE$.<Properties>apply(new Properties()));
}
 

/**
 * Creates and starts an embedded Kafka broker.
 *
 * @param config Broker configuration settings.  Used to modify, for example, the listeners
 *               the broker should use.  Note that you cannot change some settings such as
 *               `log.dirs`.
 */
public KafkaEmbedded(final Properties config) throws IOException {
  this.tmpFolder = new TemporaryFolder();
  this.tmpFolder.create();
  this.logDir = tmpFolder.newFolder();
  this.effectiveConfig = effectiveConfigFrom(config, logDir);

  final KafkaConfig kafkaConfig = new KafkaConfig(effectiveConfig, true);
  log.debug("Starting embedded Kafka broker (with log.dirs={} and ZK ensemble at {}) ...",
      logDir, zookeeperConnect());

  kafka = TestUtils.createServer(kafkaConfig, new SystemTime());
  log.debug("Startup of embedded Kafka broker at {} completed (with ZK ensemble at {}) ...",
      brokerList(), zookeeperConnect());
}
 

private String createKeytab(String principal) {

    File keytabFile = TestUtils.tempFile();

    List<String> principals = new ArrayList<>();
    principals.add(principal);
    kdc.createPrincipal(
        keytabFile,
        JavaConverters.asScalaBuffer(principals).toList()
    );

    log.debug("Keytab file for " + principal + " : " + keytabFile.getAbsolutePath());
    return keytabFile.getAbsolutePath();
  }
 

public void waitUntilMetadataIsPropagated(String topic, int numPartitions, long timeOutMS) {
  List<KafkaServer> servers = new ArrayList<>();
  servers.add(kafkaServer);
  for(int part = 0;part < numPartitions;++part) {
    TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(servers), topic, part, timeOutMS);
  }
}
 

public KafkaTestBase(String topic) throws InterruptedException, RuntimeException {

    startServer();

    this.topic = topic;

    AdminUtils.createTopic(zkClient, topic, 1, 1, new Properties());

    List<KafkaServer> servers = new ArrayList<>();
    servers.add(kafkaServer);
    TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(servers), topic, 0, 5000);

    Properties consumeProps = new Properties();
    consumeProps.put("zookeeper.connect", zkConnect);
    consumeProps.put("group.id", "testConsumer");
    consumeProps.put("zookeeper.session.timeout.ms", "10000");
    consumeProps.put("zookeeper.sync.time.ms", "10000");
    consumeProps.put("auto.commit.interval.ms", "10000");
    consumeProps.put("consumer.timeout.ms", "10000");

    consumer = Consumer.createJavaConsumerConnector(new ConsumerConfig(consumeProps));

    Map<String, Integer> topicCountMap = new HashMap<>();
    topicCountMap.put(this.topic, 1);
    Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
    List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(this.topic);
    stream = streams.get(0);

    iterator = stream.iterator();
  }
 

public Properties getClientSecurityConfig() {
  if (enableSASLSSL) {
    Properties clientSecurityProps = TestUtils.producerSecurityConfigs(
        SecurityProtocol.SASL_SSL,
        Option.apply(trustStoreFile),
        Option.apply(saslProperties)
    );

    return clientSecurityProps;
  } else {
    return new Properties();
  }
}
 

private void startBroker(int brokerId, String zkConnectString) throws IOException {
  if (brokerId < 0) {
    throw new IllegalArgumentException("broker id must not be negative");
  }

  Properties props = TestUtils
      .createBrokerConfig(
          brokerId,
          zkConnectString,
          ENABLE_CONTROLLED_SHUTDOWN,
          ENABLE_DELETE_TOPIC,
          0,
          INTER_BROKER_SECURITY_PROTOCOL,
          this.brokerTrustStoreFile,
          this.brokerSaslProperties,
          ENABLE_PLAINTEXT,
          ENABLE_SASL_PLAINTEXT,
          SASL_PLAINTEXT_PORT,
          ENABLE_SSL,
          SSL_PORT,
          this.enableSASLSSL,
          0,
          Option.<String>empty(),
          1,
          false,
          NUM_PARTITIONS,
          DEFAULT_REPLICATION_FACTOR
      );

  KafkaServer broker = TestUtils.createServer(KafkaConfig.fromProps(props), new MockTime());
  brokersById.put(brokerId, broker);
}
 

protected KafkaConfig getKafkaConfig(int brokerId) {

        final Option<java.io.File> noFile = scala.Option.apply(null);
        final Option<SecurityProtocol> noInterBrokerSecurityProtocol = scala.Option.apply(null);
        Properties props = TestUtils.createBrokerConfig(
            brokerId,
            zkConnect,
            false,
            false,
            TestUtils.RandomPort(),
            noInterBrokerSecurityProtocol,
            noFile,
            EMPTY_SASL_PROPERTIES,
            true,
            false,
            TestUtils.RandomPort(),
            false,
            TestUtils.RandomPort(),
            false,
            TestUtils.RandomPort(),
            Option.<String>empty(),
            1,
            false,
            1,
            (short) 1
        );
        injectProperties(props);
        return KafkaConfig.fromProps(props);
    }
 

@Override
protected KafkaConfig getKafkaConfig(int brokerId) {
    File trustStoreFile;
    try {
        trustStoreFile = File.createTempFile("SSLClusterTestHarness-truststore", ".jks");
    } catch (IOException ioe) {
        throw new RuntimeException("Unable to create temporary file for the truststore.");
    }
    final Option<File> trustStoreFileOption = Option.apply(trustStoreFile);
    final Option<SecurityProtocol> sslInterBrokerSecurityProtocol = Option.apply(SecurityProtocol.SSL);
    Properties props = TestUtils.createBrokerConfig(
        brokerId, zkConnect, false, false, TestUtils.RandomPort(), sslInterBrokerSecurityProtocol,
        trustStoreFileOption, EMPTY_SASL_PROPERTIES, false, false, TestUtils.RandomPort(),
        true, TestUtils.RandomPort(), false, TestUtils.RandomPort(), Option.<String>empty(), 1, false,
        1, (short) 1);

    // setup client SSL. Needs to happen before the broker is initialized, because the client's cert
    // needs to be added to the broker's trust store.
    Map<String, Object> sslConfigs;
    try {
        this.clientSslConfigs = TestSslUtils.createSslConfig(true, true, Mode.CLIENT,
            trustStoreFile, "client", "localhost");
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    injectProperties(props);
    if (requireSSLClientAuth()) {
        props.setProperty("ssl.client.auth", "required");
    }

    return KafkaConfig.fromProps(props);
}
 

protected KafkaConfig getKafkaConfig(int brokerId) {

        final Option<java.io.File> noFile = scala.Option.apply(null);
        final Option<SecurityProtocol> noInterBrokerSecurityProtocol = scala.Option.apply(null);
        Properties props = TestUtils.createBrokerConfig(
            brokerId,
            zkConnect,
            false,
            false,
            TestUtils.RandomPort(),
            noInterBrokerSecurityProtocol,
            noFile,
            EMPTY_SASL_PROPERTIES,
            true,
            false,
            TestUtils.RandomPort(),
            false,
            TestUtils.RandomPort(),
            false,
            TestUtils.RandomPort(),
            Option.<String>empty(),
            1,
            false,
            1,
            (short) 1
        );
        injectProperties(props);
        return KafkaConfig.fromProps(props);
    }
 

public KafkaComponent withBrokerPort(int brokerPort) {
  if(brokerPort <= 0)
  {
    brokerPort = TestUtils.RandomPort();
  }

  this.brokerPort = brokerPort;
  return this;
}
 

public static Properties createKafkaConfig(int port, String zkConnect, boolean autoCreateTopic, int numPartitions) {
  final Option<File> noFile = scala.Option.apply(null);
  final Option<SecurityProtocol> noInterBrokerSecurityProtocol = scala.Option.apply(null);
  Properties props = TestUtils.createBrokerConfig(
    0, zkConnect, false, false, port, noInterBrokerSecurityProtocol,
    noFile, true, false, TestUtils.RandomPort(), false, TestUtils.RandomPort(), false,
    TestUtils.RandomPort());
  props.setProperty("auto.create.topics.enable", String.valueOf(autoCreateTopic));
  props.setProperty("num.partitions", String.valueOf(numPartitions));
  props.setProperty("message.max.bytes", "500");
  return props;
}
 

private String createTopic(ZkUtils zkUtils, int partitionCount, KafkaServer kafkaServer) {
  String topic = UUID.randomUUID().toString();
  TestUtil09.createTopic(zkUtils, topic, partitionCount, 1);
  TestUtils.waitUntilMetadataIsPropagated(
    scala.collection.JavaConversions.asScalaBuffer(Arrays.asList(kafkaServer)), topic, 0, 3000);
  return topic;
}
 

/**
 * Sets up test Kafka broker.
 *
 * @throws IOException If failed.
 */
private void setupKafkaServer() throws IOException {
    kafkaCfg = new KafkaConfig(getKafkaConfig());

    kafkaSrv = TestUtils.createServer(kafkaCfg, new SystemTime());

    kafkaSrv.startup();
}
 

/**
 * Creates a topic.
 *
 * @param topic Topic name.
 * @param partitions Number of partitions for the topic.
 * @param replicationFactor Replication factor.
 * @throws TimeoutException If operation is timed out.
 * @throws InterruptedException If interrupted.
 */
public void createTopic(String topic, int partitions, int replicationFactor)
    throws TimeoutException, InterruptedException {
    List<KafkaServer> servers = new ArrayList<>();

    servers.add(kafkaSrv);

    KafkaZkClient client = kafkaSrv.zkClient();

    TestUtils.createTopic(client, topic, partitions, replicationFactor,
        scala.collection.JavaConversions.asScalaBuffer(servers), new Properties());
}
 

public void createTopic(String topic)
{
  AdminUtils.createTopic(zkUtils, topic, 1, 1, new Properties());
  List<KafkaServer> servers = new ArrayList<KafkaServer>();
  servers.add(kafkaServer);
  TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(servers), topic, 0, 30000);
}
 

public void start() throws IOException
{
  // Find port
  try {
    ServerSocket serverSocket = new ServerSocket(0);
    BROKERPORT = Integer.toString(serverSocket.getLocalPort());
    serverSocket.close();
  } catch (IOException e) {
    throw Throwables.propagate(e);
  }

  // Setup Zookeeper
  zkServer = new EmbeddedZookeeper();
  String zkConnect = BROKERHOST + ":" + zkServer.port();
  zkClient = new ZkClient(zkConnect, 30000, 30000, ZKStringSerializer$.MODULE$);
  zkUtils = ZkUtils.apply(zkClient, false);

  // Setup brokers
  cleanupDir();
  Properties props = new Properties();
  props.setProperty("zookeeper.connect", zkConnect);
  props.setProperty("broker.id", "0");
  props.setProperty("log.dirs", KAFKA_PATH);
  props.setProperty("listeners", "PLAINTEXT://" + BROKERHOST + ":" + BROKERPORT);
  KafkaConfig config = new KafkaConfig(props);
  Time mock = new MockTime();
  kafkaServer = TestUtils.createServer(config, mock);
}
 

private void initConsumer(String bootstrapServer) {
  consumer = TestUtils.createConsumer(
      bootstrapServer,
      "group",
      "earliest",
      4096L,
      "org.apache.kafka.clients.consumer.RangeAssignor",
      30000,
      SecurityProtocol.PLAINTEXT,
      Option$.MODULE$.<File>empty(),
      Option$.MODULE$.<Properties>empty(),
      new StringDeserializer(),
      new ByteArrayDeserializer(),
      Option$.MODULE$.<Properties>empty());
}