Let's set up another simple microservice to consume the random service exposed by Microservice A. Let's use Spring Initializr (https://start.spring.io) to initialize the microservice, as shown in the following screenshot:

Let's add the service to consume random service:

    @RestController
    public class NumberAdderController {
      private Log log = LogFactory.getLog(
        NumberAdderController.class);
      @Value("${number.service.url}")
      private String numberServiceUrl;
      @RequestMapping("/add")
      public Long add() {
        long sum = 0;
        ResponseEntity<Integer[]> responseEntity =
          new RestTemplate()
          .getForEntity(numberServiceUrl, Integer[].class);
        Integer[] numbers = responseEntity.getBody();
        for (int number : numbers) {
          sum += number;
        }
        log.warn("Returning " + sum);
        return sum;
      }
    }

Important things to note are as follows:

• @Value("${number.service.url}") private String numberServiceUrl: We would want the number service URL to be configurable in application properties.
• @RequestMapping("/add") public Long add(): Exposes a service at the URI /add. The add method calls the number service using RestTemplate and has the logic to sum the numbers returned in the response.

Let's configure application.properties, as shown in the following snippet:

    spring.application.name=service-consumer
    server.port=8100
    number.service.url=http://localhost:8080/random

Important things to note are as follows:

• spring.application.name=service-consumer: Configures a name for the Spring Boot application
• server.port=8100: Uses 8100 as the port for service consumer
• number.service.url=http://localhost:8080/random: Configures the number service URL for use in the add service

When the service is called at the URL http://localhost:8100/add, the following response is returned:

    2890

The following is an extract from the log of Microservice A:

    c.m.s.c.c.RandomNumberController : Returning [752,
      119, 493, 871, 445]

The log shows that random service from Microservice A returned 5 numbers. The add service in the service consumer added them up and returned a result 2890.

We now have our example microservices ready. In the next steps, we will add Cloud-Native features to these microservices.