Consuming REST APIs — Spring Technical Interview Questions & Answers

RestTemplate and the newer WebClient.

Consuming REST APIs

  • Consuming REST APIs (sb) is a Spring topic. In plain words you use it for GET /api/marks/{roll} in a campus API. Don’t start with a slogan — start with that picture.
  • Smallest example: @RestController + service call. Type it, run it, and say what you see. If you can do that from memory, you know Consuming REST APIs (sb).
  • From the example next to this theory: RestTemplate and the newer WebClient.
  • Trap: business logic inside the controller. Fix that before you talk about advanced Spring.
  • Viva: what is Consuming REST APIs (sb)? Then show @RestController + service call. Then name the trap.

Technical Interview Tip: What is Consuming REST APIs (sb)? Show this: @RestController + service call. Trap: business logic inside the controller.

Code Examples for Consuming REST APIs

Consuming REST APIs — working example

// Topic: Consuming REST APIs
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
class TopicController {
  @GetMapping("/api/topic")
  String topic() {
    return "Spring Boot: Consuming REST APIs";
  }
}

Consuming REST APIs: GET /api/topic returns this title string.

How to Explain Consuming REST APIs to an Interviewer

What is Consuming REST APIs (sb)?

Used for GET /api/marks/{roll} a campus API Not just the heading

Give one small example of Consuming REST APIs (sb).

@RestController + service call RestTemplate and the newer WebClient

What mistake do beginners make with Consuming REST APIs (sb)?

business logic inside the controller Show the fix

Where do you use Consuming REST APIs (sb)?

a campus API GET /api/marks/{roll}