Spring Boot Exception Handling Mock Test

Question 1: CORE SPRING BOOT - Purpose of @ControllerAdvice

What is the main purpose of the @ControllerAdvice annotation in Spring Boot?

Question 2: CORE SPRING BOOT - Purpose of @ExceptionHandler

Which statement correctly describes @ExceptionHandler in Spring Boot?

Question 3: CORE SPRING BOOT - Code Snippet (Global Exception Handler)

What will happen when a NullPointerException is thrown in any controller in this code?

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(NullPointerException.class)
    public ResponseEntity<String> handleNull(Exception ex) {
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Null value found!");
    }
}

Question 4: CORE SPRING BOOT - Local vs Global Exception Handling

Which statement is correct regarding local vs global exception handling in Spring Boot?

Question 5: CORE SPRING BOOT - Code Snippet (Multiple Exceptions)

What does the following code achieve?

@ControllerAdvice
public class GlobalHandler {
    @ExceptionHandler({IOException.class, SQLException.class})
    public ResponseEntity<String> handleIOAndSQL(Exception ex) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                             .body("Error: " + ex.getMessage());
    }
}

Question 6: CORE SPRING BOOT - ResponseEntity in Exception Handling

Why is ResponseEntity commonly used in exception handlers?

Question 7: CORE SPRING BOOT - Code Snippet (@RestControllerAdvice)

What is the effect of using @RestControllerAdvice instead of @ControllerAdvice?

@RestControllerAdvice
public class GlobalRestHandler {
    @ExceptionHandler(IllegalArgumentException.class)
    public Map<String, String> handleIllegalArgs(IllegalArgumentException ex) {
        Map<String, String> map = new HashMap<>();
        map.put("error", ex.getMessage());
        return map;
    }
}

Question 8: CORE SPRING BOOT - Code Snippet (Default Exception Handling)

What will happen if an unhandled exception occurs in a Spring Boot controller and no @ControllerAdvice is defined?

@RestController
public class SampleController {
    @GetMapping("/test")
    public String test() {
        throw new RuntimeException("Something went wrong!");
    }
}

Question 9: CORE SPRING BOOT - Best Practices in Exception Handling

Which of the following is a best practice for exception handling in Spring Boot?

Question 10: CORE SPRING BOOT - Custom Error Attributes

How can you customize the structure of default error responses in Spring Boot?