Field-based injection

With the @Autowired annotation, you can apply it directly to a field. In this way, you don't need to declare a setter method for it, as in the following:

@Autowired
private MessageRepository repository;

Other annotations: Besides the built-in annotations, @Required and @Autowired, Spring also supports the @javax.annotation.Resource annotation specified in JSR-250 and the @javax.inject.Inject annotation from JSR-330.