code: protected void configureObjectMapper(ObjectMapper mapper) {
  		mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
  		mapper.configure(MapperFeature.USE_STD_BEAN_NAMING, true);
  		mapper.setSerializationInclusion(Include.NON_NULL);
  		applyConfigurationPropertiesFilter(mapper);
  		applySerializationModifier(mapper);
  	}
docs: Configure Jackson's {@link ObjectMapper} to be used to serialize the
  {@link ConfigurationProperties @ConfigurationProperties} objects into a {@link Map}
  structure.
  @param mapper the object mapper