Question: What Is The Purpose Of @Autowired In Spring?

The reasons why field injection is frowned upon are as follows: You cannot create immutable objects, as you can with constructor injection.

Your classes have tight coupling with your DI container and cannot be used outside of it.

Your classes cannot be instantiated (for example in unit tests) without reflection..

What is Spring default Autowiring?

Spring Bean Autowire “no” and “default” no autowire means dependency injection will not be achieved using @Autowired annotation, it will be achieved using ref attribute. “default” autowiring is “no”. But when the bean is nested bean, then the default autowiring is parent bean autowiring.

Is @autowired required?

By default, the @Autowired annotation implies that the dependency is required. This means an exception will be thrown when a dependency is not resolved. You can override that default behavior using the (required=false) option with @Autowired .

What is difference between @inject and @autowired?

The @Autowired annotation is used for auto-wiring in Spring framework. … The @Inject annotation also serves the same purpose, but the main difference between them is that @Inject is a standard annotation for dependency injection and @Autowired is spring specific.

Should I use Autowired or inject?

Better use @Inject all the time. Because it is java configuration approach(provided by sun) which makes our application agnostic to the framework. So if you spring also your classes will work. If you use @Autowired it will works only with spring because @Autowired is spring provided annotation.