[Solved] Identify the error in the following Spring Boot controller method: @GetMapping("/user/{id}") public String getUser(@PathVariable int userId) { return "User ID: " + userId; } | Spring Boot

Spring Boot - REST Controllers

Identify the error in the following Spring Boot controller method:

@GetMapping("/user/{id}")
public String getUser(@PathVariable int userId) {
    return "User ID: " + userId;
}

AThe @PathVariable parameter name does not match the path variable name

BThe method should return a ResponseEntity instead of String

CThe @GetMapping path should not contain curly braces

DThe method parameter should be of type String, not int

Step-by-Step Solution

Solution:

Step 1: Compare path variable name and method parameter
The path is defined as /user/{id} but the method parameter is named userId without specifying the variable name in @PathVariable.
Step 2: Understand @PathVariable name matching
By default, the parameter name must match the path variable name or be explicitly specified like @PathVariable("id") int userId.
Final Answer:
The @PathVariable parameter name does not match the path variable name -> Option A
Quick Check:
Path variable names must match or be explicitly linked [OK]

Quick Trick: Match @PathVariable name with URL placeholder or specify explicitly [OK]

Common Mistakes:

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