jacksonMessageConverter corrupt mp3 file as octet encode response - json

Question

I have a spring MVC config with the following:
public class SpringConfiguration extends WebMvcConfigurerAdapter {
public MappingJackson2HttpMessageConverter jacksonMessageConverter() {
MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
ObjectMapper mapper = new ObjectMapper();
//Registering Hibernate4Module to support lazy objects
mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
mapper.registerModule(new Hibernate4Module());
messageConverter.setObjectMapper(mapper);
return messageConverter;
}
#Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
//Here we add our custom-configured HttpMessageConverter
converters.add(jacksonMessageConverter());
super.configureMessageConverters(converters);
}
}
The previous method used to ignore all lazy relation without adding JsonIgnore in model
The problem is I have a route to steam mp3 file as an octet response as following
#GetMapping(value = "/audio/{id}")
public ResponseEntity<byte[]> streamMp3FileToAdmin(#PathVariable Integer id) {
CorporateCampaign camp = corporateCampaignService.findById(id);
final HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>(Utilities.getFileAsBytes(camp.getVoiceUrl()),httpHeaders,HttpStatus.OK);
}
If I remove jackson message converter the steaming works fine but when I add jackson message converter the stream doesn't work any more
I read this question Spring MVC: How to return image in #ResponseBody?
and a lot but I didn't find a solution yet

Answer 1

You need to add produces = MediaType.APPLICATION_OCTET_STREAM to the #GetMapping(value = "/audio/{id}") to specify produced result content type and let browser recognize it properly.