[Solved] You want to create a REST controller that returns a list of user names as JSON. Which code snippet correctly achieves this? | Spring Boot

Spring Boot - REST Controllers

You want to create a REST controller that returns a list of user names as JSON. Which code snippet correctly achieves this?

A

@RestController
public class UserController {
  @GetMapping("/users")
  public List<String> getUsers() {
    return List.of("Alice", "Bob", "Carol");
  }
}

B@RestController public class UserController { @GetMapping("/users") public String getUsers() { return "Alice, Bob, Carol"; } }

C

@Controller
public class UserController {
  @GetMapping("/users")
  public List<String> getUsers() {
    return List.of("Alice", "Bob", "Carol");
  }
}

D

@RestController
public class UserController {
  @PostMapping("/users")
  public List<String> getUsers() {
    return List.of("Alice", "Bob", "Carol");
  }
}

Step-by-Step Solution

Solution:

Step 1: Check annotations and return type
@RestController with @GetMapping is correct for returning data on GET requests. Returning List will auto-convert to JSON array.
Step 2: Eliminate incorrect options
@RestController public class UserController { @GetMapping("/users") public String getUsers() { return "Alice, Bob, Carol"; } } returns a plain string, not JSON array. @Controller public class UserController { @GetMapping("/users") public List getUsers() { return List.of("Alice", "Bob", "Carol"); } } uses @Controller which does not auto-convert. @RestController public class UserController { @PostMapping("/users") public List getUsers() { return List.of("Alice", "Bob", "Carol"); } } uses @PostMapping which is wrong for GET requests.
Final Answer:
Option A code snippet correctly returns JSON list of user names -> Option A
Quick Check:
@RestController + @GetMapping + List return = JSON array [OK]

Quick Trick: Use @RestController + @GetMapping + List return for JSON arrays [OK]

Common Mistakes:

Using @Controller instead of @RestController
Returning plain strings instead of objects or lists
Using wrong HTTP method annotation

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You want to create a REST controller that returns a list of user names as JSON. Which code snippet correctly achieves this?

Step 1: Check annotations and return type

Step 2: Eliminate incorrect options

Final Answer:

Quick Check:

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