Spring @ExceptionHandler and HttpMediaTypeNotAcceptableException

The problem lies in the incompatibility of the requested content type and the object being returned. See my response on how to configure the ContentNegotiationConfigurer so that Spring determines the requested content type according to your needs (looking at the path extension, URL parameter or Accept header).

Depending on how the requested content type is determined, you have following options when an image is requested by the client:

• if the requested content type is determined by the Accept header, and if the client can/wants to handle a JSON response instead of the image data, then the client should send the request with Accept: image/*, application/json. That way Spring knows that it can safely return either the image byte data or the error JSON message.
• in any other case your best solution is to just return a HTTP error code, without any error message. You can do that in a couple of ways in your controller:

Set the error code on the response directly

public byte[] getImage(HttpServletResponse resp) {
    try {
        // return your image
    } catch (Exception e) {
        resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
}

Use ResponseEntity

public ResponseEntity<?> getImage(HttpServletResponse resp) {
    try {
        byte[] img = // your image
        return ReponseEntity.ok(img);
    } catch (Exception e) {
        return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

Use a separate @ExceptionHandler method in that controller, which will override the default Spring exception handling. That assumes you have either a dedicated exception type for image requests or a separate controller just for serving the images. Otherwise, the exception handler will handle exceptions from other endpoints in that controller, too.

What does your ExceptionInfo class look like? I run into quite similar issue after defining a few exception handlers in @ControllerAdvice annotated class. When exception happened it was caught, although the response was not return and org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation was thrown.

I figured out that the problem was caused by the fact, that I missed to add getter methods to my ErrorResponse class. After adding getter methods (this class was immutable, so there were no setter methods) everything worked like a charm.