02. Spring Boot Exception- @ControllerAdvise + @ExceptionHandler

Instructions

Add a new controller named RoleController class under controller directory.

@Controller
public class RoleController {
   @RequestMapping("/roleadd")
   public String add() {
       int num = 10 / 0;
       return "add";
   }
}

Create an exceptions folder, Create a GolbalExceptionHandler class in it.

@ControllerAdvice
public class GlobalExceptionHandler {
   @ExceptionHandler(value={java.lang.ArithmeticException.class})
   public ModelAndView handlerArithmeticException(Exception e) {
       ModelAndView modelAndView = new ModelAndView();
       modelAndView.addObject("exception", e.toString());
       modelAndView.setViewName("mathError");
       return modelAndView;
   }

   @ExceptionHandler(value={java.lang.NullPointerException.class})
   public ModelAndView handlerNullPointerException(Exception e) {
       ModelAndView modelAndView = new ModelAndView();
       modelAndView.addObject("exception", e.toString());
       modelAndView.setViewName("nullPointerError");
       return modelAndView;
   }
}

You can comment out the exception in UserController, or just leave it. For this example, we only want to test roleController