@ControllerAdvice annotation is a specialization of @Component. The classes annotated with @ControllerAdvice are auto detected by classpath scanning. The use of @ControllerAdvice is advising all or selected controllers for @ExceptionHandler, @InitBinder and @ModelAttribute. What we have to do is create a class annotated with @ControllerAdvice and create required method which will be annotated with @ExceptionHandler for global exception handling, @InitBinder for global init binding and @ModelAttribute for global model attributes addition. Whenever a request comes to controller and its method with @RequestMapping and if there is no locally defined @ExceptionHandler, @InitBinder and @ModelAttribute, the globally defined class annotated with @ControllerAdvice is served.