code: public static ConfigurableApplicationContext run(Class<?> primarySource,
  			String... args) {
  		return run(new Class<?>[] { primarySource }, args);
  	}
docs: Static helper that can be used to run a {@link SpringApplication} from the
  specified source using default settings.
  @param primarySource the primary source to load
  @param args the application arguments (usually passed from a Java main method)
  @return the running {@link ApplicationContext}