[Spring] Field Injection

Filed Injection

• 추천되지 않는 injection
• 유닛테스트하기 힘들다.
• 옛날버전 레거시에서 많이 볼 수 있음

Because…

• Field Injection is no longer cool

  • In the early days, field injection was popular on Spring projects

    • In recent years, it has fallen out of favor

  • In general, it makes the code harder to unit test

  • As a result, the spring.io team does not recommend field injection

    • However, you will still see it being used on legacy projects

Step 1: Configure the dependency injection with Autowired Annotation

File: DemoController.java

public class DemoController {

    @Autowired
    private Coach myCoach; //(Field injection)

    // No need for constructor or setters

    @GetMapping("/dailyworkout")
    public String getDailyWorkout() {
        return myCoach.getDailyWorkout();
}

}