BAEL-6415: Add simple Kafka client example (with BootStrap Servers setting)

apache-kafka-3/pom.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>apache-kafka-3</artifactId>
+    <name>apache-kafka-3</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-clients</artifactId>
+            <version>${kafka.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <kafka.version>3.5.1</kafka.version>
+    </properties>
+
+</project>

apache-kafka-3/src/main/java/com/baeldung/kafka/KafkaJava.java

@@ -0,0 +1,39 @@
+package com.baeldung.kafka;
+
+import org.apache.kafka.clients.consumer.*;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Properties;
+
+public class KafkaJava {
+
+    public static void main(String[] args) {
+        try(final Consumer<Long, String> consumer = createConsumer()) {
+            ConsumerRecords<Long, String> records = consumer.poll(Duration.ofMinutes(1));
+            for(ConsumerRecord<Long, String> record : records) {
+                System.out.println(record.value());
+            }
+        }
+    }
+
+    private static Consumer<Long, String> createConsumer() {
+        final Properties props = new Properties();
+        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
+                "localhost:9092,another-host.com:29092");
+        props.put(ConsumerConfig.GROUP_ID_CONFIG,
+                "MySampleConsumer");
+        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
+                LongDeserializer.class.getName());
+        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
+                StringDeserializer.class.getName());
+        // Create the consumer using props.
+        final Consumer<Long, String> consumer = new KafkaConsumer<Long, String>(props);
+        // Subscribe to the topic.
+        consumer.subscribe(Arrays.asList("samples"));
+        return consumer;
+    }
+
+}

pom.xml

@@ -820,6 +820,7 @@
                 <module>antlr</module>
                 <module>apache-kafka</module>
                 <module>apache-kafka-2</module>
+                <module>apache-kafka-3</module>
                 <module>apache-olingo</module>
 
                 <module>apache-poi-2</module>
@@ -1089,6 +1090,7 @@
                 <module>antlr</module>
                 <module>apache-kafka</module>
                 <module>apache-kafka-2</module>
+                <module>apache-kafka-3</module>
                 <module>apache-olingo</module>
 
                 <module>apache-poi-2</module>