Redis

Redis is a cache, message broker, and richly-featured key-value store. Spring Boot offers basic auto-configuration for the Lettuce and Jedis client libraries and the abstractions on top of them provided by Spring Data Redis.

There is a spring-boot-starter-data-redis “Starter” for collecting the dependencies in a convenient way. By default, it uses Lettuce. That starter handles both traditional and reactive applications.

We also provide a spring-boot-starter-data-redis-reactive “Starter” for consistency with the other stores with reactive support.

Connecting to Redis

You can inject an auto-configured RedisConnectionFactory, StringRedisTemplate, or vanilla RedisTemplate instance as you would any other Spring Bean. The following listing shows an example of such a bean:

Java
Kotlin

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

@Component
public class MyBean {

	private final StringRedisTemplate template;

	public MyBean(StringRedisTemplate template) {
		this.template = template;
	}

	// ...

	public Boolean someMethod() {
		return this.template.hasKey("spring");
	}

}

import org.springframework.data.redis.core.StringRedisTemplate
import org.springframework.stereotype.Component

@Component
class MyBean(private val template: StringRedisTemplate) {

	// ...

	fun someMethod(): Boolean {
		return template.hasKey("spring")
	}

}

By default, the instance tries to connect to a Redis server at localhost:6379. You can specify custom connection details using spring.data.redis.* properties, as shown in the following example:

spring:
  data:
    redis:
      host: "localhost"
      port: 6379
      database: 0
      username: "user"
      password: "secret"

You can also register an arbitrary number of beans that implement LettuceClientConfigurationBuilderCustomizer for more advanced customizations. ClientResources can also be customized using ClientResourcesBuilderCustomizer. If you use Jedis, JedisClientConfigurationBuilderCustomizer is also available. Alternatively, you can register a bean of type RedisStandaloneConfiguration, RedisSentinelConfiguration, or RedisClusterConfiguration to take full control over the configuration.

If you add your own @Bean of any of the auto-configured types, it replaces the default (except in the case of RedisTemplate, when the exclusion is based on the bean name, redisTemplate, not its type).

By default, a pooled connection factory is auto-configured if commons-pool2 is on the classpath.