Spring context and application initiation

Question

I am writing an app based on Spring Boot. I am trying to understand the difference and implications between doing either of the following:

AbstractApplicationContext context = new AnnotationConfigApplicationContext(AppContext.class);

or

SpringApplication.run(MySpringConfiguration.class, args);

Particularly I am interested in following implications:

Autowiring. When I manually get context the concrete objects inside my class don't get autowired even though I can see them in the context, when debugging.
Testing. Which way is easier to test with?

Dave Syer · Accepted Answer · 2014-06-04 05:52:03Z

Autowiring and testing should be nearly identical in both cases (the SpringApplication has a companion test annotation @SpringApplicationContext but that's the only main difference). The difference is in the features provided by SpringApplication on top of the vanilla application context (embedded servlet container, logging initialization, external config file parsing, etc.).

Just to double check - stuff will not be "autowired" into a class in which I just do "new AnnotationConfigApplicationContext(..)". That's what I am seeing at least.
Autowiring should work by default if you use @Configuration in any form. Maybe you didn't do that?

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