code: public static void register(BeanDefinitionRegistry registry, String... packageNames) {
  		Assert.notNull(registry, "Registry must not be null");
  		Assert.notNull(packageNames, "PackageNames must not be null");
  		register(registry, Arrays.asList(packageNames));
  	}
docs: Register the specified entity scan packages with the system.
  @param registry the source registry
  @param packageNames the package names to register