RESILIENCE4J

. It is a fault tolerance library

. Requires Java 17

The dependencies required are:

    <!--HEALTH OF MICROSERVICES-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <!--SENDS METRICS TO ACTUATOR TO TRACK THE STATUS OF THE CIRCUIT BREAKER-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>
    <!--TO IMPLEMENT CIRCUIT-BREAKER PATTERN-->
    <dependency>
        <groupId>io.github.resilience4j</groupId>
        <artifactId>resilience4j-spring-boot2</artifactId>
        <version>1.5.0</version>
    </dependency>

The Features and Modules of Resilience4j are:

. Circuit Breaker - Fault tolerance

. Rate Limiter - Blocks too frequent requests

. Time Limiter - Sets a time limit when calling a remote application

. Retry Mechanism - Automatic retrying (sync & async)c

. Bulkhead - Avoids too many concurrent requests

. Cache - Stores the results of a costly remote operations