[Solved] Which of the following Spring Boot controller methods correctly handles a GET request to /item/{id} and returns the id as part of the response string? | Spring Boot

Spring Boot - REST Controllers

Which of the following Spring Boot controller methods correctly handles a GET request to /item/{id} and returns the id as part of the response string?

A@GetMapping("/item/{itemId}") public String getItem(@PathVariable int id) { return "Item ID: " + id; }

B@GetMapping("/item") public String getItem(@RequestParam String id) { return "Item ID: " + id; }

C@GetMapping("/item/{id}") public String getItem(@PathVariable String id) { return "Item ID: " + id; }

D@GetMapping("/item/{id}") public String getItem(@RequestBody String id) { return "Item ID: " + id; }

Step-by-Step Solution

Solution:

Step 1: Match URL path variable
The URL path variable is {id}, so the method parameter must be annotated with @PathVariable and named id or explicitly specify the variable name.
Step 2: Check method signature
@GetMapping("/item/{id}") public String getItem(@PathVariable String id) { return "Item ID: " + id; } correctly uses @GetMapping("/item/{id}") and @PathVariable String id, returning the id in the response.
Step 3: Identify errors in other options
@GetMapping("/item") public String getItem(@RequestParam String id) { return "Item ID: " + id; } uses @RequestParam which is for query parameters, not path variables. @GetMapping("/item/{itemId}") public String getItem(@PathVariable int id) { return "Item ID: " + id; } mismatches the path variable name itemId with parameter id without specifying the name in @PathVariable. @GetMapping("/item/{id}") public String getItem(@RequestBody String id) { return "Item ID: " + id; } incorrectly uses @RequestBody which is for request bodies, not path variables.
Final Answer:
@GetMapping("/item/{id}") public String getItem(@PathVariable String id) { return "Item ID: " + id; } correctly handles the GET request with path variable id.
Quick Check:
Path variable name matches and annotation correct [OK]

Quick Trick: Use @PathVariable with matching names for path params [OK]

Common Mistakes:

Using @RequestParam instead of @PathVariable for path variables
Mismatching path variable names and method parameters
Using @RequestBody for path variables

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More Spring Boot Quizzes

Which of the following Spring Boot controller methods correctly handles a GET request to /item/{id} and returns the id as part of the response string?

Step 1: Match URL path variable

Step 2: Check method signature

Step 3: Identify errors in other options

Final Answer:

Quick Check:

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