Service-to-service communication in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a RestTemplate bean for service communication.

Spring Boot

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class AppConfig {
    @Bean
    public RestTemplate [1]() {
        return new RestTemplate();
    }
}

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ARestTemplate

BrestTemplate

CcreateRestTemplate

DgetRestTemplate

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase method name which is invalid in Java method naming conventions.

Using a name that does not match the bean usage elsewhere.

The method name restTemplate is the standard bean name for RestTemplate in Spring Boot.

2fill in blank

medium

Complete the code to send a GET request to another service using RestTemplate.

Spring Boot

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class UserService {
    @Autowired
    private RestTemplate restTemplate;

    public String getUserData() {
        String url = "http://userservice/api/users/1";
        return restTemplate.[1](url, String.class);
    }
}

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Aexchange

BpostForObject

Cput

DgetForObject

Attempts:

3 left

💡 Hint

Common Mistakes

Using postForObject which sends a POST request instead of GET.

Using put which is for updating resources.

getForObject sends a GET request and returns the response body converted to the specified class.

3fill in blank

hard

Fix the error in the RestTemplate call to send a POST request with a request body.

Spring Boot

public String createUser(String userJson) {
    String url = "http://userservice/api/users";
    return restTemplate.[1](url, userJson, String.class);
}

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ApostForObject

BgetForObject

CgetForEntity

Dput

Attempts:

3 left

💡 Hint

Common Mistakes

Using getForObject which does not send a request body.

Using put which does not return a response body.

postForObject sends a POST request with a request body and returns the response body.

4fill in blank

hard

Fill both blanks to create a Feign client interface for service-to-service calls.

Spring Boot

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.[1];
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(name = "user-service")
public interface UserClient {
    @[2]("/api/users/{id}")
    String getUserById(@PathVariable("id") String id);
}

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AGetMapping

BPostMapping

CRequestMapping

DDeleteMapping

Attempts:

3 left

💡 Hint

Common Mistakes

Using PostMapping for a GET request.

Using DeleteMapping which is for deleting resources.

Use @GetMapping annotation to define a GET request in Feign client.

5fill in blank

hard

Fill the two blanks to configure a WebClient bean with a base URL for service communication.

Spring Boot

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.function.client.WebClient;

@Configuration
public class WebClientConfig {
    @Bean
    public WebClient [1]() {
        return WebClient.builder()
            .baseUrl([2])
            .build();
    }
}

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AwebClient

B"http://orderservice/api"

C"http://inventoryservice/api"

D"http://paymentservice/api"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method name casing.

Forgetting quotes around the base URL string.

The bean method is named webClient. The base URL is set to "http://orderservice/api".