Global Exception Handling — Interview Answer — Spring Technical Interview Questions & Answers

Model answer covering @ControllerAdvice and @ExceptionHandler.

Global Exception Handling — Interview Answer

  • Model answer: I use @ControllerAdvice with @ExceptionHandler for global API errors.
  • Controllers stay clean; clients get consistent JSON errors and correct status codes.
  • Validation failures become 400; missing entities become 404.
  • Consistency and centralization are the key words.

Technical Interview Tip: Global handler + example status mapping.

Code Examples for Global Exception Handling — Interview Answer

Global Exception Handling — Interview Answer — working example

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

@RestControllerAdvice
class ApiErrors {
  @ExceptionHandler(IllegalArgumentException.class)
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  Map<String, String> badRequest(IllegalArgumentException ex) {
    return Map.of("error", ex.getMessage());
  }
}

record CreateUserRequest(@NotBlank @Email String email) {}

@RestController
class Users {
  @PostMapping("/users")
  User create(@Valid @RequestBody CreateUserRequest req) {
    return new User(req.email());
  }
}

Global Exception Handling — Interview Answer — @RestControllerAdvice centralizes API errors; @Valid triggers bean validation on DTOs.

How to Explain Global Exception Handling — Interview Answer to an Interviewer

What is Global Exception Handling — Interview Answer (sb)?

Used for a short Global Exception Handling — Interview Answer sb example a small REST app Not just the heading

Give one small example of Global Exception Handling — Interview Answer (sb).

the smallest Global Exception Handling — Interview Answer sb example you can type Model answer covering @ControllerAdvice and @ExceptionHandler

What mistake do beginners make with Global Exception Handling — Interview Answer (sb)?

only saying “Global Exception Handling — Interview Answer sb” with no example Show the fix

Where do you use Global Exception Handling — Interview Answer (sb)?

a small REST app a short Global Exception Handling — Interview Answer sb example