[2023] How to use @ControllerAdvice to handles 404 errors correctly in a Spring Boot project

controller-advice-handles-404.md

How to use @ControllerAdvice to handles 404 errors correctly in a Spring Boot project

Since many online tutorials are misleading, I want to share how I solved this problem.

The version of my spring boot used: 2.7.11

Steps

1. set this below to your application.yml

mvc:
  throw-exception-if-no-handler-found: true
web:
  resources:
    add-mappings: false

2. create your ControllerAdvice

@Component
@ControllerAdvice
public class ControllerExceptionHandler  {
    @ExceptionHandler(NoHandlerFoundException.class)
    @ResponseBody
    public String noHandlerFound() {
        return "404 error got";
    }
}

4. test your code, enjoy!

Feel free to post comments if you have any questions.