Add the @EnableCircuitBreaker annotation to the main configuration application to enable the circuit-breaker in your project. Let's see the following code:

package com.dineshonjava.customerservice; 
 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker; 
import org.springframework.cloud.client.loadbalancer.LoadBalanced; 
import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 
import org.springframework.context.annotation.Bean; 
import org.springframework.web.client.RestTemplate; 
 
@SpringBootApplication 
@EnableEurekaClient 
@EnableCircuitBreaker 
public class CustomerServiceApplication { 
 
   public static void main(String[] args) { 
         SpringApplication.run(CustomerServiceApplication.class, args); 
   } 
   ... 
         ... 
} 

I have used the @EnableCircuitBreaker annotation to enable the circuit-breaker pattern in the application. Let's see how to add Hystrix functionalities in the service layer of the application.