code: public static List<String> get(BeanFactory beanFactory) {
  		try {
  			return beanFactory.getBean(BEAN, BasePackages.class).get();
  		}
  		catch (NoSuchBeanDefinitionException ex) {
  			throw new IllegalStateException(
  					"Unable to retrieve @EnableAutoConfiguration base packages");
  		}
  	}
docs: Return the auto-configuration base packages for the given bean factory.
  @param beanFactory the source bean factory
  @return a list of auto-configuration packages
  @throws IllegalStateException if auto-configuration is not enabled