This tutorial uses Maven, but you can easily follow it with Gradle if you prefer. Modify the consumer, so each consumer processes will have a unique group id. Apache Kafka Tutorial provides details about the design goals and capabilities of Kafka. Let’s create a configuration class to do just that. Kafka Training, is a subscription to the topic. Now, the consumer you create will consume those messages. However many you set in with props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, 100); in the properties Please provide feedback. The next step is to run the broker itself. Next, let’s create an endpoint that displays a list of consumed messages. In this example, Producer 1, 2, and 3 are sending messages. Now, let’s process some records with our Kafka Producer. Every time a new message is sent from a producer to the topic, your app receives a message inside this class. You created a simple example that creates a Kafka consumer to consume messages from the Kafka Producer you created in the last tutorial. The constant TOPIC gets set to the replicated Notice that we set this to LongDeserializer as the message ids in our example are longs. It will also add Spring Security to your current application. Now that you have everything up and running, you can start integrating Kafka with a Java application! We hope you enjoyed this article. The poll method is not thread safe and is not meant to get called from multiple threads. Kafka is a unified platform for handling all the real-time data feeds. Create a src/main/java/com/okta/javakafka/configuration folder, and a ProducerConfiguration class in it: This class creates a ProducerFactory which knows how to create producers based on the configurations you provided. Opinions expressed by DZone contributors are their own. one consumer in each group, then each consumer we ran owns all of the partitions. It adds a message to the list of messages received, making it available to other classes through the getMessages() method. We also regularly publish screencasts to our YouTube channel! We do Cassandra training, Apache Spark, Kafka training, Kafka consulting and cassandra consulting with a focus on AWS and data engineering. for a particular topic. Run the consumer from your IDE. The ConcurrentKafkaListenerContainerFactory bean allows your app to consume messages in more than one thread. You now have a secure Java application that can produce and consume messages from Kafka. It is identified by its name, which depends on the user's choice. The KEY_DESERIALIZER_CLASS_CONFIG (“key.deserializer”) is a Kafka Deserializer class for Kafka record keys that implements the Kafka Deserializer interface.
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