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Running and Testing Hazelcast in a Spring Boot Application

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Running and Testing Hazelcast in a Spring Boot Application

How to start a Hazelcast instance in a Spring Boot application.

· Big Data Zone ·
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Learn how to build stream processing applications in Java-includes reference application.

The folks over at OpenCredo recently published a blog post entitled, "Running and Testing Hazelcast in a Spring Boot Application." In the post, they introduce some of the basic features of Hazelcast, some of its limitations, how to embed it in a Spring Boot application and write integration testings. Here's how to start a Hazelcast instance in a Spring Boot application. 

Hazelcast in a Spring Boot Application

Starting a Hazelcast instance in a Spring Boot application is easy:

  1. Include the com.hazelcast:hazelcast dependency
  2. Initialise a com.hazelcast.config.Config Spring bean

The following example uses Spring Boot 1.3.0. This provides Hazelcast 3.5.3 as managed dependency.

pom.xml

…
<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>1.3.0.RELEASE</version>
 <relativePath/>
</parent>
 …
<dependency>
 <groupId>com.hazelcast</groupId>
 <artifactId>hazelcast</artifactId>
 <!-- Version is managed by Spring Boot starter -->
</dependency>
…

Configuration

@Configuration
public class HazelcastConfiguration {
 @Bean
 public Config config() {
   return new Config(); // Set up any non-default config here
 }
}

Spring Boot automatically start a Hazelcast instance when it finds both:

  1. Hazelcast in classpath
  2. com.hazelcast.config.Config bean.

On startup, an instance of com.hazelcast.core.HazelcastInstance is then added to the Spring Application Context.

Learn how to build distributed stream processing applications in Java that elastically scale to meet demand- includes reference application.

Topics:
spring architecture ,spring ,spring boot

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