How to create an error handler (404, 500 ...) in Spring boot / mvc?

Question

For several hours, I have been trying to create a global CUSTOM error handler in Spring Boot / MVC. I read a lot of articles and nothing ...: / Please. Help me.

This is my error class:

I tried to create such a class

@Controller
public class ErrorPagesController {

    @RequestMapping("/404")
    @ResponseStatus(HttpStatus.NOT_FOUND)
    public String notFound() {
        return "/error/404";
    }

    @RequestMapping("/403")
    @ResponseStatus(HttpStatus.FORBIDDEN)
    public String forbidden() {
        return "/error/403";
    }

    @RequestMapping("/500")
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public String internalServerError() {
        return "/error/500";
    }

}

**** QUESTION IS SOLVED **** I used this method:

`

@Configuration
public class ErrorConfig implements EmbeddedServletContainerCustomizer {
    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/404"));
    }
}

`

Answer 1

You can try the following code:

@ControllerAdvice
public class ExceptionController {
    @ExceptionHandler(Exception.class)
    public ModelAndView handleError(HttpServletRequest request, Exception e)   {
        Logger.getLogger(getClass().getName()).log(Level.SEVERE, "Request: " + request.getRequestURL() + " raised " + e);
        return new ModelAndView("error");
    }

    @ExceptionHandler(NoHandlerFoundException.class)
    public ModelAndView handleError404(HttpServletRequest request, Exception e)   {
        Logger.getLogger(getClass().getName()).log(Level.SEVERE, "Request: " + request.getRequestURL() + " raised " + e);
        return new ModelAndView("404");
    }
}

Answer 2

In addition to @Arash, you can add a new class BaseControllerthat you can extend that handles conversion from exception to http response.

     import com.alexfrndz.pojo.ErrorResponse;
     import com.alexfrndz.pojo.Error;
     import com.alexfrndz.pojo.exceptions.NotFoundException;
     import org.springframework.http.HttpStatus;
     import org.springframework.http.ResponseEntity;
     import org.springframework.web.bind.annotation.ExceptionHandler;
     import org.springframework.web.bind.annotation.ResponseBody;
     import org.springframework.web.bind.annotation.ResponseStatus;

     import javax.persistence.NoResultException;
     import javax.servlet.http.HttpServletRequest;
     import java.util.List;

     @Slf4j
     public class BaseController {

    @ExceptionHandler(NoResultException.class)
    public ResponseEntity<Exception> handleNoResultException(
            NoResultException nre) {
        log.error("> handleNoResultException");
        log.error("- NoResultException: ", nre);
        log.error("< handleNoResultException");
        return new ResponseEntity<Exception>(HttpStatus.NOT_FOUND);
    }


    @ExceptionHandler(Exception.class)
    public ResponseEntity<Exception> handleException(Exception e) {
        log.error("> handleException");
        log.error("- Exception: ", e);
        log.error("< handleException");
        return new ResponseEntity<Exception>(e,
                HttpStatus.INTERNAL_SERVER_ERROR);
    }

    @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()));
        return new ErrorResponse(errors);
    }
   }

Answer 3

@ControllerAdvice
 public class ErrorHandler {

public RestErrorHandler() {
}

@ExceptionHandler(YourException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
public XXX processException(Exception ex){}

. , , - @ResponseBody ..

Answer 4

, : say: NoProductsFoundException, .

    import org.springframework.http.HttpStatus;
    import org.springframework.web.bind.annotation.ResponseStatus;

    @ResponseStatus(value=HttpStatus.NOT_FOUND, reason="No products found under this category")
    public class NoProductsFoundException extends RuntimeException{

    private static final long serialVersionUID =3935230281455340039L;
    }

:

    @RequestMapping("/{category}")
    public String getProductsByCategory(Model
    model,@PathVariable("category") String category) {

   List<Product> products = productService.getProductsByCategory(category);

   if (products == null || products.isEmpty()) {
   throw new NoProductsFoundException ();
   }
   model.addAttribute("products", products);
   return "products";
}

Answer 5

spring

If you want to display the HTML custom error page for this status code, you add the file to the / error folder. Error pages can be static HTML (that is, added to any of the static resource directories) or created using templates. The file name must be the exact status code or series mask.

For example, to map 404 to a static HTML file, your folder structure would look like this:

src/
 +- main/
     +- java/
     |   + <source code>
     +- resources/
         +- public/
             +- error/
             |   +- 404.html
             +- <other public assets>

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