custom Exceptions while working on spring boot web - spring

Question

I have a Controller which is implementing ErrorController
which handles any error that occurs in my spring project, below is the code.
#Controller
public class CustomErrorController implements ErrorController {
#RequestMapping("/error")
public void springWebErrors() {
return "springWebErrorPage"
}
}
also, I have mentioned
server.error.path=/error
but I am stuck where sometimes data might be not as per needs, so I want to give my customized messages,
are there any ideas on how to achieve it? (thanks)

Answer 1

As far as I understood your concern,
You want your application to handle errors/ exceptions when user sends invalid data,
I have applied same thing in my code using custom Exceptions, ControllerAdvice & Exception Handler,
please check the below code, which might be useful.
#ControllerAdvice
public class ExceptionController {
#ExceptionHandler(value = PageNotFoundException.class)
public String pageNotFoundException(PageNotFoundException exception){
return "error/404";
}
#ExceptionHandler(value = AuthFailedException.class)
public String authFailedException(AuthFailedException exception){
return "error/401";
}
#ExceptionHandler(value = ServerException.class)
public String serverException(ServerException exception){
return "error/500";
}
}
Explanation: #ControllerAdvice & #ExceptionHandler is global error controller, you can visit the documentation here
#Controller
public class CustomizedErrorController implements ErrorController {
#RequestMapping("/error")
public void handleError(HttpServletRequest request) {
Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
if (status != null) {
int statusCode = Integer.parseInt(status.toString());
if(statusCode == HttpStatus.NOT_FOUND.value()) {
throw new PageNotFoundException();
}
else if(statusCode == HttpStatus.UNAUTHORIZED.value()) {
throw new AuthFailedException();
}
else if(statusCode == HttpStatus.INTERNAL_SERVER_ERROR.value()) {
throw new ServerException();
}
}
else{
throw new OtherException();
}
}
}
You can also throw your custom exception from your implementation or controller file.
I hope, it helps