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BAEL-5680: Guide to Check if Apache Kafka Server is Running (#12600) 

Co-authored-by: Tapan Avasthi <tavasthi@Tapans-MacBook-Air.local>
This commit is contained in:
Tapan Avasthi 2022-08-18 08:22:06 +05:30 committed by GitHub
parent 2d5e7da1fa
commit 4e18fd0aa9
6 changed files with 152 additions and 0 deletions
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apache-kafka-2/README.md Normal file
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## Apache Kafka
This module contains articles about Apache Kafka.
##### Building the project
You can build the project from the command line using: *mvn clean install*, or in an IDE.

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apache-kafka-2/log4j.properties Normal file
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log4j.rootLogger=INFO, stdout

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apache-kafka-2/pom.xml Normal file
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<?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-2</artifactId>
<name>apache-kafka-2</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>${kafka.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>kafka</artifactId>
<version>${testcontainers-kafka.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${testcontainers-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<kafka.version>2.8.0</kafka.version>
<testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
<testcontainers-jupiter.version>1.15.3</testcontainers-jupiter.version>
<lombok.version>1.18.20</lombok.version>
</properties>
</project>

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apache-kafka-2/src/main/java/com/baeldung/kafka/KafkaAdminClient.java Normal file
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package com.baeldung.kafka;
import java.util.Collection;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.common.Node;
public class KafkaAdminClient {
private final AdminClient client;
public KafkaAdminClient(String bootstrap) {
Properties props = new Properties();
props.put("bootstrap.servers", bootstrap);
props.put("request.timeout.ms", 3000);
props.put("connections.max.idle.ms", 5000);
this.client = AdminClient.create(props);
}
public boolean verifyConnection() throws ExecutionException, InterruptedException {
Collection<Node> nodes = this.client.describeCluster()
.nodes()
.get();
return nodes != null && nodes.size() > 0;
}
public static void main(String[] args) throws ExecutionException, InterruptedException {
String defaultBootStrapServer = "localhost:9092";
KafkaAdminClient kafkaAdminClient = new KafkaAdminClient(defaultBootStrapServer);
System.out.println(kafkaAdminClient.verifyConnection());
}
}

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apache-kafka-2/src/test/java/com/baeldung/kafka/KafkaConnectionLiveTest.java Normal file
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package com.baeldung.kafka;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.testcontainers.containers.KafkaContainer;
import org.testcontainers.junit.jupiter.Container;
import org.testcontainers.junit.jupiter.Testcontainers;
import org.testcontainers.utility.DockerImageName;
import static org.assertj.core.api.Assertions.assertThat;
// This live test needs a running Docker instance so that a kafka container can be created
@Testcontainers
class KafkaConnectionLiveTest {
@Container
private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
private KafkaAdminClient kafkaAdminClient;
@BeforeEach
void setup() {
KAFKA_CONTAINER.addExposedPort(9092);
this.kafkaAdminClient = new KafkaAdminClient(KAFKA_CONTAINER.getBootstrapServers());
}
@AfterEach
void destroy() {
KAFKA_CONTAINER.stop();
}
@Test
void givenKafkaIsRunning_whenCheckedForConnection_thenConnectionIsVerified() throws Exception {
boolean alive = kafkaAdminClient.verifyConnection();
assertThat(alive).isTrue();
}
}

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pom.xml
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<module>apache-cxf-modules</module>
<module>apache-kafka</module>
<module>apache-kafka-2</module>
<module>apache-libraries</module>
<module>apache-olingo</module>
<module>apache-poi</module>
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<module>apache-cxf-modules</module>
<module>apache-kafka</module>
<module>apache-kafka-2</module>
<module>apache-libraries</module>
<module>apache-olingo</module>
<module>apache-poi</module>