code: protected String toJson(Object value) {
  
  		OBJECT_MAPPER.setDateFormat(AppConfig.DATE_FORMAT);
  		try {
  			return OBJECT_MAPPER.writeValueAsString(value);
  
  		} catch (JsonGenerationException e) {
  			throw new RuntimeException(e);
  		} catch (JsonMappingException e) {
  			throw new RuntimeException(e);
  		} catch (IOException e) {
  			throw new RuntimeException(e);
  		}
  	}
docs: toJson
  
  @param value
  @return json