@Autowired 옵션

해당 옵션 적용시 해당 빈 객체 없어도 오류 안남

    static class TestBean
    {
        @Autowired(required = false)
        public void setNoBean(Member noBean1) {
            System.out.println("noBean1 = " + noBean1);
        }
        @Autowired
        public void setNoBean2(@Nullable Member noBean1) {
            System.out.println("noBean1 = " + noBean1);
        }

        @Autowired
        public void setNoBean3(Optional<Member> noBean3) {
            System.out.println("noBean3 = " + noBean3);
        }
    }