HazelCast in Spring-boot Application

How to configure a hazelcast client in a spring boot application

HazelCast

Hazelcast is an In-Memory Computing Platform is comprised of Hazelcast IMDG, the most widely deployed in-memory data grid, and Hazelcast Jet, the industry’s most advanced in-memory stream processing solution

How to configure Java Spring boot application to connect running HazelCast member instance.

Create a Spring-boot application

Follow the below spring starter project link to create a spring-boot application

Spring Initializr

Import the project to your favorite IDE

Once you import the project to your favorite IDE, start the boot application.

Configure HazelCast with Spring-boot

Add the below Maven dependency to your project pom.xml

<dependency>
    <groupId>com.hazelcast</groupId>
    <artifactId>hazelcast-client</artifactId>
    <version>3.12.5</version>
</dependency>

Connect to a HazleCast Instance

We can connect to hazelcast using hazelcast.xml or Java Config, let us see how to set-up the connection using java-config.

Create a Java Class and add the method in the below example.

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.hazelcast.HazelcastKeyValueAdapter;
import org.springframework.data.hazelcast.repository.config.EnableHazelcastRepositories;
import org.springframework.data.keyvalue.core.KeyValueOperations;
import org.springframework.data.keyvalue.core.KeyValueTemplate;
@Configuration
public class HazelCastConfig {
@Bean
    HazelcastInstance hazelcastInstance() {
        ClientConfig clientConfig = new ClientConfig();
        return HazelcastClient.newHazelcastClient(clientConfig);
    }
@Bean
    public KeyValueOperations keyValueTemplate() {
        return new KeyValueTemplate(new HazelcastKeyValueAdapter(hazelcastInstance()));
    }
@Bean
    public HazelcastKeyValueAdapter hazelcastKeyValueAdapter(@Qualifier("hazelcastInstance") HazelcastInstance hazelcastInstance) {
        return new HazelcastKeyValueAdapter(hazelcastInstance);
    }
}

Build and Deploy spring-boot

Once you successfully build your project, run the spring-boot application either through the command line or with in your IDE. There should not be any start-up errors if your HazelCast instance is already up and running

Github link

You can find a working code for this example at our git repo

escuelatech/tutorials

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