Error on starting up Kafka

Hi I am getting these errors in the console when running a test with a very simple example:

10:47:40.333 [kafka-network-thread-1-ListenerName(PLAINTEXT)-PLAINTEXT-0] DEBUG org.apache.kafka.common.network.Selector - [SocketServer brokerId=1] Connection with /127.0.0.1 disconnected
java.io.EOFException: null
	at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:96)
	at org.apache.kafka.common.network.KafkaChannel.receive(KafkaChannel.java:381)
	at org.apache.kafka.common.network.KafkaChannel.read(KafkaChannel.java:342)
	at org.apache.kafka.common.network.Selector.attemptRead(Selector.java:609)
	at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:541)
	at org.apache.kafka.common.network.Selector.poll(Selector.java:467)
	at kafka.network.Processor.poll(SocketServer.scala:689)
	at kafka.network.Processor.run(SocketServer.scala:594)
	at java.lang.Thread.run(Thread.java:748)
10:47:40.333 [kafka-network-thread-1-ListenerName(PLAINTEXT)-PLAINTEXT-1] DEBUG org.apache.kafka.common.network.Selector - [SocketServer brokerId=1] Connection with /127.0.0.1 disconnected
java.io.EOFException: null
	at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:96)
	at org.apache.kafka.common.network.KafkaChannel.receive(KafkaChannel.java:381)
	at org.apache.kafka.common.network.KafkaChannel.read(KafkaChannel.java:342)
	at org.apache.kafka.common.network.Selector.attemptRead(Selector.java:609)
	at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:541)
	at org.apache.kafka.common.network.Selector.poll(Selector.java:467)
	at kafka.network.Processor.poll(SocketServer.scala:689)
	at kafka.network.Processor.run(SocketServer.scala:594)
	at java.lang.Thread.run(Thread.java:748)

I am using the following versions:

• <kafka.version>2.1.1</kafka.version>
• <kafka.junit4.version>3.1.0</kafka.junit4.version>

And this is the code:

    @ClassRule
    public static final SharedKafkaTestResource sharedKafkaTestResource = new SharedKafkaTestResource();

    @Test
    public void kafkaTest() {

        long timeout = 1000L * 60L * 5L;
        long start = System.currentTimeMillis();

        while (System.currentTimeMillis() - start <= timeout) {

        }

        System.out.println("Exiting test");
    }

However, I tested Kafka directly from the console (kafka-console-consumer.sh and kafka-console-producer.sh) and it seems to be working properly.

[MatanRubin]

@Crim, feel free to ignore my last comment. I saw many exceptions in the test log and thought it meant the server is not ready, but then I re-read this thread and understood that these exceptions are shown in DEBUG level and are not an actual issue.

I created a small test just to make sure everything is working properly - and it does. Posting the test here for posterity.

public class KafkaTest {

    @ClassRule
    public static final SharedKafkaTestResource sharedKafkaTestResource = new SharedKafkaTestResource();

    @Test
    public void testSendReceive() throws TimeoutException {
        KafkaTestUtils testUtils = sharedKafkaTestResource.getKafkaTestUtils();

        // wait for broker to start listening
        testUtils.waitForBrokerToComeOnLine(1, 10, TimeUnit.SECONDS);

        String topicName = "testTopic";
        testUtils.createTopic(topicName, 1, (short) 1);

        KafkaProducer<String, String> producer =
                testUtils.getKafkaProducer(StringSerializer.class, StringSerializer.class);
        producer.send(new ProducerRecord<>(topicName, null, "value"));

        Properties properties = new Properties();
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group-id");
        KafkaConsumer<String, String> consumer =
                testUtils.getKafkaConsumer(StringDeserializer.class, StringDeserializer.class, properties);
        consumer.subscribe(Collections.singletonList(topicName));
        ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(10));
        for (ConsumerRecord<String, String> record : records) {
            Assert.assertEquals("value", record.value());
        }
    }
}

[MatanRubin]

cool, thanks for letting me know!