Failure in Custom Exception Handler for HttpMediaTypeNotAcceptableException

Question

I'm trying to add a custom Exception handler, which can add a more understandable response to my Spring Boot Rest API, whenever a person uses wrong Accept: Headers. Looking at my logs, the DefaultExceptionhandler resolves the following:

Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]

Writing a Custom Exception Handler, I want to return an HTTP Status BAD_REQUEST and an error message, explaining which Media Types are supported.

I tried the following Code:

@ControllerAdvice
public class CustomRestExceptionHandler {

    @ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
    public ResponseEntity<Error> handleException(
            HttpMediaTypeNotAcceptableException e
    ) {
        List<MediaType> supportedTypes = e.getSupportedMediaTypes();
        List<String> supported = new ArrayList<>();
        for (MediaType type: supportedTypes){
            supported.add(type.getType()+type.getSubtype());
        }
        String error = "Media Type not supported. The following types are supported: " + String.join(", ", supported);

        return new ResponseEntity<>(
                new Error(
                        HttpStatus.BAD_REQUEST,
                        error
                ),
                HttpStatus.BAD_REQUEST
        );
    }
}

@Data
public class Error {
    private final HttpStatus httpStatus;
    private final String message;
}

Now, whenever I use the wrong Accept:Header, I get a Warning in my logs:

97 WARN 5368 --- [nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Failure in @ExceptionHandler de.sajoconsulting.convertpdfdemo.error.CustomRestExceptionHandler#handleException(HttpMediaTypeNotAcceptableException)

And finally, the DefaultHandler resolves the Exception like normal, leading to the same HTTP Status.

I also took a look at: https://stackoverflow.com/a/74697214/20893655 which suggests it might have to do something with missing Getter and Setters, which I did provide by Lombok's @Data.

Failure in Custom Exception Handler for HttpMediaTypeNotAcceptableException

0 Answers0