How to implement exception handling using Spring Boot?

Spring provides an easy way to handle exceptions using ControllerAdvice annotation. We handle all exceptions thrown by the controller class by implementing a ControlerAdvice class.

Spring 3.2 brings support for a global @ExceptionHandler with the @ControllerAdvice annotation that enables a mechanism that deviates from the older MVC model of the exception handling and makes use of ResponseEntity along with the type safety and flexibility of @ExceptionHandler.

@ControllerAdvice
public class RestResponseEntityExceptionHandler 
  extends ResponseEntityExceptionHandler {
 
    @ExceptionHandler(value 
      = { EntityNotFoundException.class, MyCustomException.class, IllegalArgumentException.class, IllegalStateException.class })
    protected ResponseEntity<Object> handleConflict(
      RuntimeException ex, WebRequest request) {
        String bodyOfResponse = "Exception occurred somewhere at the application level";
        return handleExceptionInternal(ex, bodyOfResponse, 
          new HttpHeaders(), HttpStatus.CONFLICT, request);
    }
}

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