Snippet

Handling Custom Exceptions with Controller Advice

In Spring applications, handling errors centrally avoids repetitive try-catch blocks across controllers. The @RestControllerAdvice annotation intercepts exceptions thrown by handler methods across the entire application, while @ExceptionHandler maps a specific exception type to a structured HTTP response.

snippet.java

java

@RestControllerAdvice
public class GlobalExceptionHandler {
 
    @ExceptionHandler(UserNotFoundException.class)
    public ResponseEntity<String> handleUserNotFound(UserNotFoundException ex) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage());
    }
}

spring

Breakdown

@RestControllerAdvice

Registers this class as a global interceptor for exceptions thrown in REST controllers.

@ExceptionHandler(UserNotFoundException.class)

Specifies that the method should execute when a UserNotFoundException is thrown.

return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage());

Constructs and returns an HTTP 404 response with the exception message as the body.

Previous snippet Next snippet

More Beginner Java exercises →

Handling Custom Exceptions with Controller Advice

Related