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Hazelcast

If Hazelcast is on the classpath and a suitable configuration is found, Spring Boot auto-configures a HazelcastInstance that you can inject in your application.

Spring Boot first attempts to create a client by checking the following configuration options:

  • The presence of a com.hazelcast.client.config.ClientConfig bean.

  • A configuration file defined by the configprop:spring.hazelcast.config[] property.

  • The presence of the hazelcast.client.config system property.

  • A hazelcast-client.xml in the working directory or at the root of the classpath.

  • A hazelcast-client.yaml (or hazelcast-client.yml) in the working directory or at the root of the classpath.

Note
 Spring Boot supports both Hazelcast 4 and Hazelcast 3. If you downgrade to Hazelcast 3, hazelcast-client should be added to the classpath to configure a client.

If a client can not be created, Spring Boot attempts to configure an embedded server. If you define a com.hazelcast.config.Config bean, Spring Boot uses that. If your configuration defines an instance name, Spring Boot tries to locate an existing instance rather than creating a new one.

You could also specify the Hazelcast configuration file to use through configuration, as shown in the following example:

spring:
  hazelcast:
    config: "classpath:config/my-hazelcast.xml"

Otherwise, Spring Boot tries to find the Hazelcast configuration from the default locations: hazelcast.xml in the working directory or at the root of the classpath, or a .yaml/.yml counterpart in the same locations. We also check if the hazelcast.config system property is set. See the Hazelcast documentation for more details.

Note
 Spring Boot also has explicit caching support for Hazelcast. If caching is enabled, the HazelcastInstance is automatically wrapped in a CacheManager implementation.