Spring instead of Autowired annotation.

Alternative way instead of using Autowired
purpose : make test mock injection easy ++

Best practice :: with annotaion of @RequiredArgsConstructor :
inject mock with constructor
differences : make constructor with final args
because repository made or injected never change.

import org.springframework.beans.factory.annotation.Autowired;

@Service
@Transactional(readOnly = true) // get이 더 많은 경우 
@RequiredArgsConstructor 
public class MemberService {
  // @Autowired not used here
   private final MemberRepository memberRepository;
  
  ...
}

with Autowried on member feild
cons : Not easy to test

import org.springframework.beans.factory.annotation.Autowired;

@Service
@Transactional(readOnly = true) // get이 더 많은 경우 
public class MemberService {
  @Autowired
  private MemberRepository memberRepository; 
  
  ...
}

with Autowried on method to set
good for injecting mock but not perfect in production mode

    @Autowired
     public void setMemberRepository(MemberRepository memberRepository) {
    	this.memberRepository = memberRepository;
    }

with annotaion of @AllArgsConstructor :
inject mock with constructor
make constructor with all args
pros : Good for testing

import org.springframework.beans.factory.annotation.Autowired;

@Service
@Transactional(readOnly = true) // get이 더 많은 경우 
@AllArgsConstructor // 모든 필드에 대한 생성자 모두 컨트스럭터 등 생성해줌
public class MemberService {
  // @Autowired not used here
  private MemberRepository memberRepository; 
  
  ...
}