What will be the output when accessing the endpoint defined by this REST controller method?

medium📝 component behavior Q13 of 15

Spring Boot - REST Controllers

@RestController
public class HelloController {
  @GetMapping("/hello")
  public String sayHello() {
    return "Hello, World!";
  }
}

AA JSON object {"message":"Hello, World!"}

BPlain text response: Hello, World!

CHTTP 404 Not Found error

DAn HTML page with 'Hello, World!' text

Step-by-Step Solution

Solution:

Step 1: Analyze the method return type and annotation
The method returns a String and is inside a @RestController, so the string is sent as plain text.
Step 2: Understand @RestController behavior
@RestController automatically adds @ResponseBody, so the return is the response body, not a view or JSON object.
Final Answer:
Plain text response: Hello, World! -> Option B
Quick Check:
String return in @RestController = plain text response [OK]

Quick Trick: String return in @RestController sends plain text response [OK]

Common Mistakes:

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