protected boolean hasNotMatchingMediaType(MediaType mediaType) {
        if (mediaType == null) {
            return false;
        }
        String subtype = mediaType.getSubtype();
        return !(("json".equalsIgnoreCase(subtype))
                || (subtype.endsWith("+json"))
                || ("javascript".equals(subtype))
                || ("x-javascript".equals(subtype))
                || ("x-json".equals(subtype))
                || ("x-www-form-urlencoded".equalsIgnoreCase(subtype))
                || (subtype.endsWith("x-www-form-urlencoded")));
    }
Check media type like "application/json".

@param mediaType media type
@return true if the media type is valid
extension-jaxrs/extension-jaxrs-jakarta/src/main/java/com/alibaba/fastjson2/support/jaxrs/jakarta/FastJson2Provider.java