Spring Boot - REST Controllers
Identify the error in this Spring Boot POST method:
@PostMapping("/addUser")
public String addUser(String user) {
return "User " + user + " added";
}
Identify the error in this Spring Boot POST method: @PostMapping("/addUser") public String addUser(String user) { return "User " + user + " added"; }
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Check parameter binding
The method expects to receive data in the POST request body, so the parameter must be annotated with @RequestBody to bind JSON or raw data.Step 2: Verify annotations
Without @RequestBody, Spring won't map the request body to the 'user' parameter, causing it to be null or empty.Final Answer:
Missing @RequestBody annotation for 'user' parameter -> Option DQuick Check:
POST body needs @RequestBody on parameter [OK]
Quick Trick: Add @RequestBody to method parameter for POST data [OK]
Common Mistakes:
- Forgetting @RequestBody on POST method parameters
- Using @GetMapping for POST endpoints
- Confusing @PathVariable with request body
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