registry-service:

step1. DI:

(1). Eureka Server

it is an application that holds the information about all client-service applications.

(2). Configuration

server.port=8761

eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

(3). Added annotation

@EnableEurekaServer

@SpringBootApplication
@EnableEurekaServer
public class RegistryServiceApplication {

	public static void main(String[] args) {
		SpringApplication.run(RegistryServiceApplication.class, args);
	}

}

step2. DI for client-service apllications: department-service, user-service, and other microservice

<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

step3. Configuration for client-service apllications: department-service, user-service, and other microservice

eureka:
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    hostname: localhost