In my Spring Boot Application, I'm currently leveraging the resources/public/error/404.html custom error page to show (automagically) this 404 page errors on invalid URLS.
Is there an easy way to retain this auto functionality, and add a simple log message (with the invalid URL) for every such 404 ?
Ideally with as little code as possible I would want some like :
//Some code
LOGGER.warn("Invalid URL " + request.url);
//Some more code
You need to define a custom ErrorViewResolver:
@Component
public class MyErrorViewResolver implements ErrorViewResolver {
@Override
public ModelAndView resolveErrorView(HttpServletRequest request, HttpStatus status, Map<String, Object> model) {
if (HttpStatus.NOT_FOUND == status) {
LoggerFactory.getLogger(this.getClass()).error("error 404 for url " + model.get("path"));
return new ModelAndView("error404", model);
}
else {
return new ModelAndView("error", model);
}
}
}
This MyErrorViewResolver will be automatically called in the BasicErrorController class.
For a 404 error, the view "error404" will be displayed.
For the other errors, the view "error" will be displayed.
Views must be in the "templates" folder (resources/templates/error404.html).
Add NotFoundException handler.
public class BaseController {
// Logger declaration
@ExceptionHandler(NotFoundException.class)
@ResponseStatus(value = HttpStatus.NOT_FOUND)
@ResponseBody
public ErrorResponse handleNotFoundError(HttpServletRequest req, NotFoundException exception) {
List<Error> errors = Lists.newArrayList();
errors.add(new Error(String.valueOf(exception.getCode()), exception.getMessage()));
log.error(exception);
return new ErrorResponse(errors);
}
}