Consider this controller code snippet:

Consider this controller code snippet:

@RestController
public class DemoController {
  @GetMapping("/demo")
  public String demo() {
    throw new IllegalArgumentException("Invalid argument");
  }

  @ExceptionHandler(NullPointerException.class)
  public String handleNull() {
    return "Null error";
  }
}

What will happen when the /demo endpoint is called?