public class Image implements Serializable {

   private byte[] profilePic;

   private String user_id;

   private String profilePicContentType;

   //getter & setter methods below

}

@RequestMapping(value = "/images",
    method = RequestMethod.POST,
    produces = MediaType.APPLICATION_JSON_VALUE)
@Timed
public ResponseEntity<Image> createImage(@RequestBody Image image) throws URISyntaxException {
    log.debug("REST request to save Image : {}", image);
    if (image.getId() != null) {
        return ResponseEntity.badRequest().headers(HeaderUtil.createFailureAlert("image", "idexists", "A new image cannot already have an ID")).body(null);
    }
    Image result = imageService.save(image);
    return ResponseEntity.created(new URI("/api/images/" + result.getId()))
        .headers(HeaderUtil.createEntityCreationAlert("image", result.getId().toString()))
        .body(result);
}

<div class="btn btn-primary" ngf-select ng-model="vm.settingsAccount.profilePic" name="file" ngf-pattern="'image/*'"
                ngf-accept="'image/*'" ngf-max-size="16MB" ngf-min-height="100"
                ngf-resize="{width: 100, height: 100}">Select</div>

var imageDomain = function (settingsAccount){
            return {
                profilePic: settingsAccount.profilePic,
                user_id : settingsAccount.login,
                profile_pic_content_type : 'UTF-8'
            }
        }

function save(){
   vm.image = imageDomain(vm.settingsAccount);
   ImageService.update(vm.image);
}