@RestController
public class LoginController {

    @RequestMapping(value = "/login", method = POST, produces = "application/json")
    ResponseEntity<LoginResponse> login(@RequestBody LoginRequest loginRequest) {
        // ...
    }
}

{
"timestamp": 1423844498998,
"status": 415,
"error": "Unsupported Media Type",
"exception": "org.springframework.web.HttpMediaTypeNotSupportedException",
"message": "Content type 'text/plain;charset=UTF-8' not supported",
"path": "/login/"
}

public class CustomerJsonHttpMessageConverter extends AbstractHttpMessageConverter<Object> {

private              ObjectMapper mapper          = new ObjectMapper();
private static final Charset      DEFAULT_CHARSET = Charset.forName("UTF-8");

public CustomerJsonHttpMessageConverter() {
    super(new MediaType("application", "json", DEFAULT_CHARSET));
}

@Override
protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) throws IOException,
                                                                                    HttpMessageNotReadableException {
    return mapper.readValue(inputMessage.getBody(), clazz);
}

@Override
protected boolean supports(Class<?> clazz) {
    return true;
}

@Override
protected void writeInternal(Object value, HttpOutputMessage outputMessage) throws IOException,
                                                                                   HttpMessageNotWritableException {
    String json = mapper.writeValueAsString(value);
    outputMessage.getBody().write(json.getBytes());
}

MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
    converter.setSupportedMediaTypes(
            Arrays.asList(
                    new MediaType("text", "plain"),
                    new MediaType("text", "html")
            ));

@Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter converter =
        new MappingJackson2HttpMessageConverter(new CustomObjectMapper());
    converter.setSupportedMediaTypes(Arrays.asList(MediaType.ALL));
    return converter;
}