[Solved] Consider this Spring Boot controller method: @PostMapping("/register")... } If the User object has a @NotBlank field 'email' and the client sends an empty email, what will the HTTP response contain? | Spring Boot

Spring Boot - Exception Handling

Consider this Spring Boot controller method:

@PostMapping("/register")
public ResponseEntity registerUser(@Valid @RequestBody User user) {
    return ResponseEntity.ok("Registration successful");
}

If the User object has a @NotBlank field 'email' and the client sends an empty email, what will the HTTP response contain?

AHTTP 404 status indicating resource not found

BHTTP 200 status with "Registration successful" message

CHTTP 500 status with server error stack trace

DHTTP 400 status with a default validation error message in the response body

Step-by-Step Solution

Solution:

Step 1: Recognize validation failure
Empty 'email' violates @NotBlank, triggering validation failure.
Step 2: Default Spring Boot behavior
Spring Boot returns HTTP 400 Bad Request with a default error message describing the validation issue.
Final Answer:
HTTP 400 status with a default validation error message in the response body is correct.
Quick Check:
Validation failure returns 400 with error details [OK]

Quick Trick: Invalid input triggers 400 with validation error message [OK]

Common Mistakes:

Assuming 200 OK despite validation failure
Expecting 500 Internal Server Error for validation issues
Confusing 404 Not Found with validation errors

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Consider this Spring Boot controller method:

Step 1: Recognize validation failure

Step 2: Default Spring Boot behavior

Final Answer:

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